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ASN.1 and PKCS/CMS
ASN.1 encodings: BER, CER, DER
PKCS/CMS standards by RSA
Block cipher modes of operation
Initialisation Vectors
Padding Schemes, Salt
Striking example (Linux Tux penguin image) of ECB leaking information at http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation