PKCS#7 - Cryptographic Message Syntax Standard

Giriş
Sertifikanın public key bilgisi ile şifreleme yapar ve private key bilgisi ile şifrelenmiş veriyi açar. Açıklaması şöyle.

Some extended features of PKCS #7 includes:

It can encrypt using multiple certificates at the same time
Recursive, means a digital envelop is wrapped in a digital envelop and further in another digital envelop and so on
Time stamps for encrypted message and digital signatures
Counter signatures and user defined characteristics

PKCS#5 Padding
Açıklaması şöyle.

PKCS#5 only specifies padding for DES, and that has an 8 byte block size.

PKCS#7 Padding
Açıklaması şöyle.

PKCS#7 (rfc2315) is defined up to 256-byte blocks that covers AES, too.