Guidelines for Cryptographic Algorithm Agility and Selecting Mandatory-to-Implement Algorithms, November 2015
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Many IETF protocols use cryptographic algorithms to provide confidentiality, integrity, authentication, or digital signature. Communicating peers must support a common set of cryptographic algorithms for these mechanisms to work properly. This memo provides guidelines to ensure that protocols have the ability to migrate from one mandatory-to-implement algorithm suite to another over time.
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 4844.