a system for encoding and decoding secret messages.
Also, crypto system.

1965–70; crypto- + system Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica


any method of transforming a message to conceal its meaning. The term is also used synonymously with ciphertext or cryptogram in reference to the encrypted form of the message. A brief treatment of ciphers follows. For full treatment, see cryptology.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Key replacement enables one to take advantage of the hardware improvements to increase the security of the cryptosystem.
In a public key cryptosystem, you don't have to protect public keys from exposure.
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