Hi, My proposal is to have a crypto library that provides high-level facilities. The library has different encapsulation layers. Within the low-level (internal) there are algorithms that share the same concept i.e. class block_cipher_type: + setkey(const void* key, size_type key_size) -> void; + encrypt(void* output, const void* input) -> const void; + decrypt(void* output, const void* input) -> const void; class stream_cipher_type: + create() -> void; + update(const void* input, size_type output) -> void; + update_final_block(const void* input, size_type output) -> void; and etc. Also entropy sources that use kernel specific entropies with addition of asynchronous generators. Finally a std:: iostream interface for cryptographically transformed streams. That use a transformer for the cryptographical transformation. Any interest??? -- Kasra