In modern cryptography, null encryption (or selecting null cipher or NONE cipher) is choosing not to use encryption in a system where various encryption options are offered. When this option is used, the text is the same before and after encryption, which can be practical for testing/debugging, or authentication-only communication. In mathematics such a function is known as the identity function.
- "ciphers - SSL cipher display and cipher list tool". OpenSSL. Retrieved 2014-12-10.
- RFC 2410 - The NULL Encryption Algorithm and Its Use With IPsec
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