Any cryptosystem that requires the use of a key to convert, unit by unit, plain text , encoded text, or signals into an unintelligible form for secure transmission . Note: The capability to decipher must be available at the receiving site.
CIPHER SYSTEM
Meaning of CIPHER SYSTEM in English
Telecommunication standard terms English vocab. Английский словарь стандартных телекоммуникационных терминов. 2012