9.3. TCP MD5 Transport

9.3 TCP MD5 Transport

If TCP MD5 is used, implementations MUST support key lengths of at least 80 printable ASCII bytes, per Section 4.5 of [RFC2385]. Implementations MUST also support hexadecimal sequences of at least 32 characters, i.e., 128 bits.

Key rollover with TCP MD5 is problematic. Cache servers SHOULD support [RFC4808].