Sistema de cifrado.
Any cryptographic system in
which arbitrary symbols or groups of symbols, represent units of plain text, or
in which units of plain text are rearranged, or both. [CNSSI_4009:2010]
(I) A cryptographic
algorithm for encryption and decryption. [RFC4949:2007]
alternative term for
encipherment system. [ISO-18033-1:2005]