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The newest version of CMS (as of 2024) is specified in RFC 5652 (but also see RFC 5911 for updated ASN.1 modules conforming to ASN.1 2002 and RFC 8933 and RFC 9629 for updates to the standard). The architecture of CMS is built around certificate-based key management, such as the profile defined by the PKIX working group .
In cryptography, PKCS #7 ("PKCS #7: Cryptographic Message Syntax", "CMS") is a standard syntax for storing signed and/or encrypted data. PKCS #7 is one of the family of standards called Public-Key Cryptography Standards ( PKCS ) created by RSA Laboratories .
CMS is one of two protocols utilizing the Certificate Request Message Format (CRMF), described in RFC 4211, with the other protocol being CMP. The Enrollment over Secure Transport (EST) protocol, described in RFC 7030 , can be seen as a profile of CMC for use in provisioning certificates to end entities.
PKCS Standards Summary; Version Name Comments PKCS #1: 2.2: RSA Cryptography Standard [1]: See RFC 8017. Defines the mathematical properties and format of RSA public and private keys (ASN.1-encoded in clear-text), and the basic algorithms and encoding/padding schemes for performing RSA encryption, decryption, and producing and verifying signatures.
Enrollment request messages employ the Certificate Request Message Format (CRMF), described in RFC 4211. The only other protocol so far using CRMF is Certificate Management over CMS (CMC), described in RFC 5273 .
S/MIME (Secure/Multipurpose Internet Mail Extensions) is a standard for public-key encryption and signing of MIME data. S/MIME is on an IETF standards track and defined in a number of documents, most importantly RFC 8551.
If you do decide to switch into Traditional Medicare, you can either call Medicare (800-63304227) to disenroll from Medicare Advantage, phone your Medicare Advantage insurer to get a disenrollment ...
The CRMF format, as used by Certificate Management Protocol (CMP) and CMS, is more flexible here, supporting also keys that are usable for encryption only. Although proof-of-origin of certificate enrollment requests, i.e., authentication of the certificate requester, is the most critical security requirement, for pragmatic reasons its support ...