….1) with an underlying block cipher, which shall be either DES [NIST46] or RC2 [RFC2268] in cipher block chaining (CBC) mode [NIST81]. PBES1 is compatible with the encryption scheme in PKCS #5 v1.5 [PKCS5_15]. PBES1 is recommended only for compatibility with existing applications…

…tandards Track [Page 52] RFC 8551 S/MIME 4.0 Message Specification April 2019 [ RFC2268 ] Rivest, R., "A Description of the RC2(r) Encryption Algorithm", RFC 2268 , DOI 10.17487/RFC2268, March 1998, < https://www.rfc-editor.org/info/rfc2268 >. [ RFC2311 ] Dusse, S., Hoffman, P., …