2.4.3 Cryptographic Requirements for Transmitters

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The following security requirements MUST be implemented by transmitters:

  • The block cipher is AES with 128-bit keys, supporting Electronic Code Book (ECB) and CTR [FIPS197].

  • The public key cryptography is 1024-bit RSA [PKCS1].

  • The hashing algorithm is Secure Hashing Algorithm 1 (SHA-1) [FIPS180-2].

  • The HMAC is AES One-Key Cipher Block Chaining MAC 1 (OMAC1) [OMAC].

  • The Microsoft Root Public Key MUST be stored in a manner that is consistent with the [CR-WMDRM] for transmitters.

  • The certificate revocation list (CRL) MUST be stored in a manner that is consistent with the [CR-WMDRM].

  • The random number generator used to generate the encrypted seed MUST be cryptographically random in a manner that is consistent with the [CR-WMDRM].

  • A secure and accurate timer MUST be used for proximity detection. It MUST be accurate to the millisecond.