Basic Access Protection (BAP) mechanism to confirm that an inspection system (IS) has physical access to a proximity integrated circuit card (smart card) before the IS is allowed access to the data stored on the PICC and to ensure that communication between the IS and the PICC (once access is authorized) is protected. Basic Access Protection is used to protect personal driving license holder data against unauthorized reading attempts and prevents skimming as well as eavesdropping by encrypting the communication between chip and terminal as an alternative to BAC (Basic Access Control). Basic Access Protection a generalization of BAC allowing usage of extra algorithms and key length. It exists in 4 modes:
- BAP1 – 3DES with key length of 128 bits (equivalent to BAC),
- BAP2 – AES with key length of 128 bits,
- BAP3 – AES with key length of 192 bits,
- BAP4 – AES with key length of 256 bits.
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