I think CrytoAPI is compatible with RFC 3852 ( http://msdn.microsoft.com/en-us/library/aa378122(VS.85).aspx ) There are some changes ( http://msdn.microsoft.com/en-us/library/aa387729(VS.85).aspx ) in the API for this.... am I correct? the cryptoAPI is 100% compatible with RFC 3852? There are any example using this version CMS (RFC 3852)? The examples in MSDN is PKCS#7 (older CMS RFC 2315) thanks for help Luis Ricardo