C5 – M.O.S.T. Card® Contact Microprocessor Smart Cards

C5 – M.O.S.T. Card® Contact Microprocessor Smart Cards

  • Built on Common Criteria EAL5+ Certified Silicon
  • Powered by CardLogix’ M.O.S.T.® Operating System
  • AES 128 and 3DES Encryption
  • Special transport keys for lifecycle control
  • SHA-1 for mutual authentication
  • Extended file sizes that breaks the 32k byte barrier set by ISO
  • Forensic information command
  • Protocol: T=0


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CardLogix M.O.S.T. Card® C5 Series is a contact microprocessor smart card family built on CC EAL5+ certified silicon and powered by the M.O.S.T. Card Operating System.  The cards are designed for multi-function and/or high security applications. The C5 family features up to 68k bytes of user memory that can be configured for a wide variety of applications including token authentication, encrypted data storage, and session key-based purse functions.

The M.O.S.T. C5 Card series features advanced password security logic, AES and 3DES encryption, SHA1 hashing and authentication, and flexible file management. Its 24 byte global unique identifier (GUID) makes the credential truly unique. The silicon provides continuous internal encryption of all data and the virtualization and rotation of the data across the non-volatile memory for secure data storage.

The M.O.S.T. OS also features an error detection code and security self-tests with built-in anti-tearing mechanisms to support heavy transactional environments. The C5 series supports EF-level PIN/passwords, multiple file types, and includes an internal random number generator for unique transaction sessions.

CardLogix M.O.S.T. Toolz™ SDK lets you design a system that grows with your needs. M.O.S.T. Card is future-proofed while working on multiple silicon vendors’ devices, so your projects will always be supported. M.O.S.T. Cards enable multiple applications on a single card, and they are a mission critical component of the infrastructure to keep your system safe. Build confidence in your chain of trust with proven smart card technology and CardLogix services.


General Features

  • Operating voltage range: 1.62V to 5.5V (ISO 7816 Class A, B, and C)
  • CRC16 and CRC32 engines are compliant with ISO/IEC 3309
  • Global Unique Card Identifier system (GUID) is compliant with ASN.1 Object Identifier components (ITU-T Rec. X.667 | ISO/IEC 9834-8, and with IETF RFC 4122)
  • Conforms to FIPS 197
  • Authentication mechanisms are fully compliant to Secure Hash Standard (SHS) FIPS PUB 180-4
  • Conforms to (HDLC) procedures ISO/IEC 13239:2002
  • Programmable passwords for all access modes: read, write, update, invalidate and rehabilitate
  • Data retention > 10 years
  • Endurance: maximum of 16.5 million programming cycles at 25° C
  • Electrostatic discharge protection > 6,000V

File Support

  • Master File (MF)
  • Directory File (DF)
  • EF Transparent File
  • EF Large File Size
  • Linear & Cyclical Files
  • Purse Files
  • APP & CHV Password Files

Encryption / Authentication

  • SHA-1
  • 3DES
  • AES-128

High-Security Architecture

  • A wide variety of user memory sizes
  • T=0 Protocol
  • PC/SC compatible
  • Negotiable communication speed (PTS)
  • Rapid card development through M.O.S.T. Toolz
  • Multiple reader and terminal choices
  • ISO 7816 1-4

Dedicated Semiconductor and Operating System Countermeasures Guard Against:

  • Side channel attacks
  • Advanced fault attacks
  • Velocity checking
  • Voltage attacks
  • Frequency attacks
  • Temperature glitch attacks
  • Optical attacks

Custom Card Security Options

  • Laser engraving/indenting
  • Guilloche and rosettes
  • Microprinting
  • Optically Variable Devices (OVDs) and holograms
  • Hidden Card Validator™ graphics with lens viewer
  • Ultraviolet (UV) ink
  • Watermark
  • SBumps

Learn more about CardLogix pre-printed 2400 DPI ReadyStart™ Secure Cards and pre-stamped Holofoil Cards™


M.O.S.T. Card C Series | Features Comparison (C5, C6, C7, C8. C9)

MOST Card Matrix


High Security Architecture—Powered by the M.O.S.T. Card® Operating System

The C5 card contains CardLogix’ M.O.S.T Card Operating System which supports a variety of security measures, including SHA-1 bi-directional / mutual authentication, AES, DES, and 3DES, PIN/passwords, and internal random number generation for unique e-signatures and transaction sessions. The OS is built with an error detection code and security self-tests. The EAL certified silicon provides continuous encryption of all data and the virtualization of the data across the non-volatile memory. The M.O.S.T. OS also features built-in anti-tearing mechanisms to support heavy transactional environments.

Simplified Smart Card Development

CardLogix has provided a complete line of user-friendly development tools for programmers to create both custom and pre-configured smart card applications. Project development for the M.O.S.T. Card C5 is supported by the

API and the M.O.S.T. Toolz™ Card File Creation Utility SDK, including the powerful Winplex® API. The M.O.S.T. Card File Creation Utility features an intuitive user-interface that allows a card issuer the flexibility to design a M.O.S.T. Card file structure and set passwords that fit the needs of any custom smart card program. M.O.S.T. Toolz also provides intelligently constructed, pre-configured idblox™ applications cards that leverage the M.O.S.T. Card Operating System. With the pre-configured idblox option, a card issuer’s only job is to setup passwords, and it doesn’t require the work of programmers. Smart card development could not get any easier.

Eliminate the need to hire a graphic designer by starting with one of CardLogix’ professionally designed, pre-printed ReadyStart™ Secure Cards or Holofoil Cards, with embedded 2D holograms. Both use high security graphic printing technology that provides additional levels of physical security to your M.O.S.T. Card®

Software and Hardware Interoperability

The M.O.S.T. Card C5 family is future-proofed, working on multiple silicon vendors’ devices so that your projects are always supported. The card family is part of the idblox™ ecosystem which has attracted multiple vendors for compatible smart card readers, smart card terminals, smart card applications, and all other smart card infrastructure components.

Smart Card Personalization Made Easy

The M.O.S.T. Card family is supported by the latest innovation in smart card personalization—The Card Encoding Engine™. The Card Encoding Engine is the first of its kind to offer smart card encoding without requiring programming first in order to do so. This revolutionary software engine is the cornerstone of idblox, allowing inline creation of a smart eID card program from design to use without relying on programmers.

Learn more about the idblox™ ecosystem, the only smart card ecosystem with true interoperability that enables the fastest, easiest and most affordable creation of high-security smart card programs for any card application.

Large EEPROM Storage Capacity

The M.O.S.T. Card C5 family offers up to 68k bytes of user memory. Large storage capacity means advanced functionality, multiple on-card applications, and increased security. The C5 family allows a user to securely store and transmit large amounts of personal and sensitive data, including biometric information—data too vulnerable to store over a loosely protected network. The M.O.S.T. Card is capable of holding the information needed to verify identity and authenticate authorized personnel and devices, so that loyalty, e-payment and identification programs can benefit from a closed system that does not depend on being connected to a network at all times.

Security and Functionality That Users Can Afford

The M.O.S.T. Card C5 leverages the Advanced Encryption Standard (AES) for data encryption, the strongest encryption algorithm to date, so that your data will remain 100% confidential no matter where it is transmitted. AES has typically been found on card operating systems that support public key infrastructure, but now users can get PKI security at the price of a symmetric key card.

Multiple Applications on One Card

With the M.O.S.T. Card C5, your organization can benefit from the economies of scale achieved by using one card for multiple purposes. Why settle for a single-purpose memory card when a company can combine a customer loyalty program, multi-factor identification, e-payment system, physical access control, and player tracking onto one company-branded M.O.S.T. Card for the same price or less as a memory card? Improve your organization’s security by arming your employees with the M.O.S.T. Card to handle multi-factor authentication and non-refutable identification. Use the same card to control facility access rights, to institute an employee incentive program, and to protect classified or sensitive data. The application possibilities are endless, and the M.O.S.T. Card can handle it all to meet any of your organization’s needs.

Seamless Biometric Enrollment

CardLogix is strategically partnered with Corvus Integration, Inc., experts in biometric enrollment and biometric verification technologies, to bring you the simplest way to register biometric information of personnel and load it onto a smart card within minutes. Biometric data paired with a smart card provides the highest security and protection of personnel, data and valuable assets. With the M.O.S.T. Card C5, your organization can benefit from this level of security without having to spend more money than it’s worth.


MOST Card Matrix


M.O.S.T. Toolz™ SDK

Rated “Most comprehensive and professional SDK for smart card system developments”, MOST Toolz is designed for multi-function and high security smart card systems.  M.O.S.T. Toolz™ is an affordable SDK and Card Configuration Utility for developing the M.O.S.T. Card® and other microprocessor smart cards. High level commands are sent through the Winplex® API to the card reader, which is included in the M.O.S.T. Toolz kit. M.O.S.T. Toolz enables programmers to create a smart card-based transaction system that updates and secures files while setting a variety of defensive measures to protect user ID, card access, and file information. CardLogix gives you the power to deliver multiple products and services on a single card, allowing for fast system design and easy updating without the need for card re-issuance.

MOST Smart Card Development

MOST Smart Card Development


M.O.S.T. Card C5 Series Options

The M.O.S.T. Card C5 Microprocessor Smart Card is available in the following sizes:

  • CLXSU064KC5/T=0ED (8k Bytes)
  • CLXSU128KC5/T=0ED (16k Bytes)
  • CLXSU256KC5/T=0ED (32k Bytes)
  • CLXSU544KC5/T=0ED (68k Bytes)

CardLogix Smart Cards are versatile and can be custom-made to meet Your Unique Requirements.

CardLogix is a full-service card manufacturer. Cards are built from the inside-out, from card substrate selection and artwork preparation to chip initialization, personalization, and many other card options.

For a comprehensive list of our card offerings, see the CardLogix Smart Card Product Selection Guide

Custom Card Options

CardLogix can build the card that’s right for your application(s). Card options include a variety of card technologies, security graphics, custom design and printing services, and card substrates. All CardLogix cards can be developed as hybrid cards with both a contact and contactless interface. They can be combined with additional card technologies such as CPU or memory chips, magnetic stripes, 1D/2D barcodes, and MRZs (Machine Readable Zones). Combination cards and hybrid cards expand application possibilities for an infinite number of ID card solutions. This versatility also enables the integration of newer card technologies into legacy readers and systems to protect existing technology investment and lifespan.

Card Technologies

Hybrid Cards – Combination Cards

Add a memory chip or UHF chip/ tag to your smart card for legacy applications, such as payments for catering, vending machines, parking, or transportation; or for physical access systems. CardLogix can provide many chip options, including HID Prox® and 1125mhz proximity. These chips use RFID, NFC, and UHF technologies that follow the ISO/IEC 14443, ISO 15693, and ISO 18092 standards. Add a contact chip card, such as one of CardLogix M.O.S.T. Card® C5 or C7 microprocessor chips, for applications that require a secure contact interface. Combine with a M.O.S.T. Card C6 or C8 microprocessor chip for highest-security, high-speed, contactless applications.

Magnetic Stripe

CardLogix offers a full lineup of magnetic stripe card (magstripe) options. Magnetic Stripes are a useful feature to add to your cards so that they continue to work with existing legacy card readers and software programs. Magstripes are a good option for Loyalty Card programs or Gift Card programs. CardLogix can pre-load custom data on the magnetic stripe or it can be customer-encoded. The magnetic stripe card works in conjunction with the promoter’s software in order to provide the cardholder with special offers, credit toward purchases, and marketing incentives. It s also used in building databases that help analyze buying habits of customers. This information is useful because retailers can better serve their customer base by stocking the products they are most interested in buying. It also has many more uses that offer a wealth of valuable marketing applications.

Magnetic stripe options:

  • 2trk & 3trk
  • LoCo (300oe), MidCo (2750oe), or HiCo (4000oe)
  • Stripe and card color options: black, white, gold, silver, red, brown, blue, green, and holographic


CardLogix can print sequential or custom numbered barcodes using barcodes such as 2D, PDF417, 3 of 9, HIBC, code 128, etc. Barcoding is a popular option that can be added to any card. Most modern retail cash register systems read barcodes at the checkout stand so this is the perfect and fastest way to gather information about customers and to see what they are buying. It is also a great way to manage memberships in facilities and operations that have many cards to flow in and out. Each card is capable of carrying a unique barcode on either the front or reverse side. Another advantage of an ID card with a barcode printed on it is that it can be scanned extremely quickly to identify the user.

Primary Card Artwork: Design & Printing

The same background artwork that you see on every card for a specific program? That’s the primary card artwork. The background artwork gets printed and embedded at the point of card manufacturing. As card layers are stacked together, so is your artwork.

CardLogix offers graphic design, artwork preparation, and consulting services for your primary card artwork. Send what you have, and we’ll do the rest.

Secondary Card Printing

This is what gets printed after your cards are in their final shape. Secondary printing usually involves variable data; that is, data that is different on each card. This includes serial numbers, photo IDs, cardholder data, and more.

Depending on the size of your project,  CardLogix can do this for you. Services include printing unique ID card numbers to each card, serialized laser engraving, and more.  For smaller runs or for applications that involve distributed, instant card issuance, we recommend purchasing one or more ID Card Printers with ID Card Printer Software, such as CardLogix’ Card Encoding Engine

Custom Security Graphics

Security graphics are usually applied to cards at the point of manufacture. They use very specific, high-end printing and engraving technologies that make cloning and fraud extremely difficult for perpetrators.

Signature panel

Customers have the option of including a signature panel on the reverse of the card or a digitally scanned signature on the front of the card. Adding a signature panel to your card gives makes it possible to add information on the card at a later time.

Embossing and Tipping

Tipping refers to coloring tip of the raised or embossed letters with certain colors to make the numbers or letters stand out from the card. Gold and silver colors are available.

Sequential Numbering

This option can be added to any card order to help in the identification of a card holder or special program that the number may be referencing.

Laser Engraving

Add your company logo or symbol to your card to increase security or brand awareness. You can also laser engrave a unique or sequential number and/or barcode.

Additional Graphic Options:

  • Full color offset printing
  • Silk-screen printing
  • Silver/Gold silk-screen printing background
  • Variable Data Printing, such as numbers, photos, PIN codes and other information that is unique to each card
  • Sequential Numbering

Additional Security Options:

  • Laser engraving/indenting
  • Guilloche and rosettes
  • Microprinting
  • Optically Variable Devices (OVDs) and holograms
  • Hidden Card Validator™ graphics with lens viewer
  • Ultraviolet (UV) ink
  • Watermark
  • SBumps
  • Holographic lamination

Other Security Graphics Options:

  • Numbering: Jet dot/ Thermal transfer/ Laser engrave
  • Many flood colors are available
  • Scratch Off Panels that reveal unique ID’s such as PIN number
  • Variety of card thickness
  • Plain and custom (such as company logo) Tyvek card sleeves
  • Card wallet book such as for passports and themed books for promotional purposes
  • Hole punch for ID clip necklaces
  • SIM punch and key tag punched
  • Card Surface: Matte/ gloss finish

Pre-Designed Security Graphics

These can be pre-printed on cards for purchases off-shelf, or they can be combined with other artwork.

CardLogix Holofoil Cards

CardLogix Holofoil Cards are a cost-effective and non-peelable alternative to holographic laminates for increasing a card’s physical security. The holofoils are embedded within the card substrate, providing a smooth surface with no damage to print heads. CardLogix Holofoil Cards can be purchased off-the-shelf with several designs to choose from, or they can be built to order with your custom designs.

CardLogix ReadyStart™ Secure Cards

ReadyStart Secure Cards are a family of pre-printed ultra-high resolution 2400 dpi security background plastic cards that enable a rapid start in the physical security, personalization and issuance of smart card and eID Credentials. ReadyStart Secure Cards are available off-the-shelf in many popular and industry-specific ID card designs. They significantly reduce the time and expense of custom graphic designing and card printing. Corresponding ReadyStart background templates can be found in CardLogix Card Encoding Engine™ Card Personalization software.

Card Substrate Options

CardLogix’ standard card is constructed with white, commercial grade PVC substrate and a mirror-mirror finish for use with desktop printers. Other, higher-end card substrates are available.

Commercial Grade Cards

Commercial Grade Cards are general purpose card bodies for applications such as loyalty and libraries. The majority of PVC cards in your wallet today are made with Commercial Grade substrates, and they are the most cost effective option.

PVC (Polyvinyl chloride)

PVC is the most widely used material for plastic cards, and has been used for photo IDs for more than 10 years. Low in cost, the smooth surface of photo quality PVC material accepts dyes for high quality ID image printing and is compatible with most laminate materials.

PET (Polyethylene terephthalate)

PET is a polyester material that was used for many years for the punch laminate style of IDs. It is a crystalline plastic and has higher heat resistance than PVC. Durable and resistant to moisture and chemical attack, the material is typically used as an outer laminate for PVC, composite and Teslin cards. PET is more expensive than PVC, and is generally used as part of a multi-part card construction.

Biodegradable Grade Cards

These eco-friendly, biodegradable cards are manufactured from corn and based on the (NatureWorks® PLA) material. They look and feel identical to traditional plastic PVC cards.

Precision Identity Grade Cards

Precision Identity Grade Cards should be used when dimensional tolerances are critical and when the cards will be printed with additional graphic imaging (such as an employee badge).

Government Certified Cards

Government Certified Cards are uniquely built to meet ongoing card body certifications and requirements for different governments. CardLogix can help you come through with the toughest cards certified today.

Molded ABS SIM Cards

Molded ABS SIM Cards are designed for the specific demands of the Telecommunication industry. These cards have a higher Vicat softening point, and are best suited for the high temperatures in mobile devices and are rarely handled by the consumer.

PC (Polycarbonate)

Polycarbonate is an extremely durable thermoplastic polymer resistant to high temperatures and impact. Used in items like DVDs and CDs, it is receptive to offset security printing. PC is not compatible with variable printing, such as resin transfer or dye diffusion. When constructed with a very thin transparent laser receptive layer, PC cards can be laser engraved with very high definition graphics. Cards can be assembled with RFID, IC and contactless technology. PC is more difficult to manufacture, and is more expensive to produce than PVC or composite cards. PC cards are primarily used with laser technology to produce black images/text. PC or PC composite cards are typically used for the longest life and/or highest security IDs.


M.O.S.T. Card C5 Series Product Support

Marketing Literature


M.O.S.T. Card C5 Series Applications

  • Loyalty Cards
  • Healthcare (EMR)
  • Ticketing
  • Cashless Vending
  • Gaming
  • Public Transit
  • e-Banking
  • Identity
  • Charging the money card (e-purse)
  • Enterprise Badging
  • e-Passport personalization & verification
  • PKI (public-key infrastructure) Applications
  • e-Commerce (online payment)
  • Secure network access
  • Hospitality
  • Electronic voting
  • Computer security (log in access)
  • Energy Management
  • Border Crossing
  • Customs
  • Access Control System
  • Time and attendance System
  • Hazmat Cards
  • Set-Top Cards
  • Debit Cards, ATM Cards, Credit Cards
  • Driving License
  • Petrol Card
  • National ID Cards
  • NFC Payment


About CardLogix Corporation

Corporate Profile

CardLogix is an ISO 9001:2015 certified smart card manufacturer, software developer, and the premier provider of smart card technology with a comprehensive line of SDKs and tools that enable easy and rapid development of high quality smart cards. Since 1998, CardLogix has supplied millions of cards and card components to over 42 countries around the world. As an expert in smart card and chip technology, card operating systems, card software, development tools, and middleware, CardLogix has continuously been at the forefront of smart card technology.

CardLogix’ Mission

CardLogix’ mission is to make highly secure, high quality smart card systems more widely available to customers in need. CardLogix strives to make data transactions more secure, personnel and assets more protected, and to turn otherwise complex and expensive smart card systems into simpler, more cost-effective, and easier-to-develop solutions for everyone.

CardLogix Values

Trust is the primary commodity that CardLogix trades in every day. CardLogix builds and maintains customers’ confidence their products and processes, so that they can trust our cards to reliably protect personnel, sensitive data, and their most valuable assets. Starting with development software that’s flexible and easy to use to uncompromising customer support, CardLogix delivers on the promise of trust that our service inspires and our cards guarantee. Our company culture breeds initiative, commitment, and follow-through. As a global supplier and active industry participant, CardLogix understands the importance of being a responsible global business. With recycling, energy conservation, and full RoHS compliance, the company meets its goals with the environment in mind.

CardLogix Advantage

  • Experts in smart card technology with an understanding of what it takes to get a card project from A to Z
  • Commitment to ISO, ICAO, and industry conformance to ensure performance and interoperability
  • Extensive partnerships with companies that offer complementary smart card infrastructure components
  • Innovative products and solutions that simplify smart card development
  • Cutting edge technology, sophistication and differentiated quality at a fraction of competitors’ costs
  • Continuous customer support and involvement with evolving card projects

CardLogix Solutions

CardLogix manufactures high security and multi-functional ISO compliant smart cards, powered by CardLogix’ own operating systems. CardLogix offers easy-to-use SDKs for programmers, powerful middleware and APIs, a variety of applications software, and innovative solutions that empower end-users to develop and personalize smart cards without requiring any user-programming. The company partners with key suppliers in software, biometric capture, readers, and printers to deliver complete, leading-edge solutions. CardLogix smart card platforms provide solutions for multiple applications to markets globally, such as national, civil, voter and enterprise identity; physical and logical access cards; stored value; loyalty and rewards programs; e-purse; gaming, healthcare and other solutions that use a combination of multiple applications onto one card.

View CardLogix case studies.



AES (Advanced Encryption Standard)
A symmetric 128-bit block data encryption technique developed by Belgian cryptographers Joan Daemen and Vincent Rijmen. The U.S government adopted the algorithm as its encryption technique in October 2000, replacing the DES encryption it used. AES works at multiple network layers simultaneously. The National Institute of Standards and Technology (NIST) of the U.S. Department of Commerce selected the algorithm, called Rijndael (pronounced Rhine Dahl or Rain Doll), out of a group of five algorithms under consideration, including one called MARS from a large research team at IBM.
A card feature which protects the contents of memory if the card is removed before the end of the transaction.
API (Application programming interface)
a source code interface that a computer system or program library provides to support requests for services to be made of it by a computer program. An API differs from an application binary interface in that it is specified in terms of a programming language that can be compiled when an application is built, rather than an explicit low level description of how data is laid out in memory.
Cardholder Verification
DES (Data Encryption Standard)
A widely-used method of data encryption using a private (secret) key that was judged so difficult to break by the U.S. government that it was restricted for exportation to other countries. There are 72,000,000,000,000,000 (72 quadrillion) or more possible encryption keys that can be used. For each given message, the key is chosen at random from among this enormous number of keys. Like other private key cryptographic methods, both the sender and the receiver must know and use the same private key.
Electronic Health Record (EHR or EMR)
An electronic health record is a collection of patient health information generated by one or more meetings in any care delivery setting. An EHR typically includes patient demographics, progress notes, problems, medications, vital signs, past medical history, immunizations, laboratory data and radiology reports. It’ss said to streamline clinicians’s workflow, and it has the ability to generate a complete record of a clinical patient encounter.
E-purse (electronic purse)
A smart card can be used to store a monetary value for small purchases. Card readers retrieve the amount currently stored, and subtract the amount for the goods or services being purchased. Groceries, transportation tickets, parking, laundromats, cafeterias, taxis and all types of vending machines are only some of the purchases that often do not reach amounts to justify the hassle of using a credit card (a cash card reader does not require a permanent phone connection with a host computer). Radio-read smart cards will allow the free flow of people through transportation systems, avoiding the need of ticketing machines or validation gates.
FIPS (Federal Information Processing Standards)
A set of standards that describe document processing, encryption algorithms and other information technology standards for use within non-military government agencies and by government contractors and vendors who work with the agencies.
GUID (Global Unique Identifier)
A unique reference number used as an identifier in computer software. The term GUID typically refers to various implementations of the universally unique identifier (UUID) standard. A smart card can register support for an interface through association with the interface’s (GUID). This binding between a card and an interface is done at the time the card is first introduced to the system&emdash;typically when the SCSP is installed. Once the card is introduced to the system, applications can search for smart cards, based on a specific interface or GUID. For example, a cash card could make itself available to Windows-based applications by registering interfaces to access its purse scheme.
ISO (International Standardization Organization)
An organization that sets standards in many businesses and technologies, including computing and communications.
A chip that serves as the Central Processing Unit controlling a computer. It provides programmable intelligence.
PC/SC (Personal Computer/Smart Card)
A specification for smart-card integration into computing environments. Microsoft has implemented PC/SC in Microsoft Windows 200x/XP and makes it available under Microsoft Windows NT/9x. A free implementation of PC/SC, PC/SC Lite, is available for Linux and other Unixes; a forked version comes bundled with Mac OS X.
PKI (Public key infrastructure)
Enables users of a basically unsecure public network such as the Internet to securely and privately exchange data and money through the use of a public and a private cryptographic key pair that is obtained and shared through a trusted authority. The public key infrastructure provides for a digital certificate that can identify an individual or an organization and directory services that can store and, when necessary, revoke the certificates. Although the components of a PKI are generally understood, a number of different vendor approaches and services are emerging. Meanwhile, an Internet standard for PKI is being worked on.
Secure Hash Algorithm (SHA-1)
A 160-bit hash function which resembles the earlier MD5 algorithm. This was designed by the National Security Agency (NSA) to be part of the Digital Signature Algorithm. Cryptographic weaknesses were discovered in SHA-1, and the standard was no longer approved for most cryptographic uses after 2010.
SDK (Software Development Kit)
A package of pre-written code that developers can re-use in order to minimize the amount of unique code that they need to develop themselves. SDKs can help to prevent unnecessary duplication of effort in a development community.
A character-level transmission protocol, defined in ISO/IEC 7816-3. T=0 requires 2 request/response pairs per command (send command and get response saying got command, then a command to get the response and then the actual response).
3DES (Triple DES)
Triple DES is a minor variation of this standard. It is three times slower than regular DES but can be billions of times more secure if used properly. Triple DES enjoys much wider use than DES because DES is so easy to break with today’s rapidly advancing technology. This just serves to illustrate that any organization with moderate resources can break through DES with very little effort these days.