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The Cryptographic Message Syntax (CMS) is the IETF's standard for cryptographically protected messages. It can be used by cryptographic schemes and protocols to digitally sign , digest , authenticate or encrypt any form of digital data.
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 a general framework for electronic signatures for various kinds of transactions like purchase requisition, contracts or invoices. [2] CAdES specifies precise profiles of CMS signed data making it compliant with the European eIDAS regulation (Regulation on electronic identification and trust services for electronic transactions in the internal market).
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.
The signature is (,) The calculation of k {\displaystyle k} and r {\displaystyle r} amounts to creating a new per-message key. The modular exponentiation in computing r {\displaystyle r} is the most computationally expensive part of the signing operation, but it may be computed before the message is known.
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Proof-of-possession is usually done by a self-signature of the requested certificate contents, but CMP supports also other methods. CMP supports the very important aspect of proof-of-origin in two formats: based on a shared secret (used initially) and signature-based (using pre-existing certificates).
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 ...
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