The associated items of COMSEC material used as a unit to provide a single means of encryption or decryption.

an algorithm, plus all possible plaintexts, ciphertexts and keys

A method of disguising messages so that only certain people can see through the disguise. A cryptosystem is usually a whole collection of algorithms which are labeled and called "keys." Cryptography is the art of creating and using cryptosystems. To top

Associated COMSEC items interacting to provide a single means of encryption or decryption.

The combination of a cryptographic algorithm and all possible plaintexts, ciphertexts, and keys.

Algorithm plus the plaintext and all the key

the entire process of using cryptography. This includes the actions of encrypting and decrypting a file or message, or authenticating the sender of an e-mail message.

A system composed of cryptographic algorithms, all possible plaintext, ciphertext, and keys.

A cryptosystem is a system for encrypting and decrypting data. Encryption involves an algorithm for combining the original data (plaintext) with one or more keys -- numbers or strings of characters known only to the sender and/or recipient. The resulting output is known as ciphertext. The security of a cryptosystem usually depends on the secrecy of (some of) the keys rather than on the supposed secrecy of the algorithm. A strong cryptosystem has a large range of possible keys so that it is not possible to just try all possible keys. A strong cryptosystem will produce Ciphertext that appears random to all standard statistical tests. A strong cryptosystem will resist all known previous methods for breaking codes (cryptanalysis).

There are two different meanings of the word cryptosystem. One is used by the cryptographic community, while the other is the meaning understood by the public.