The CAST-128 Encryption Algorithm, May 1997
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There is a need in the Internet community for an unencumbered encryption algorithm with a range of key sizes that can provide security for a variety of cryptographic applications and protocols. This document describes an existing algorithm that can be used to satisfy this requirement. This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind.
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 8729.