Null encryption

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.

Examples of this are the "eNull" cipher suite in OpenSSL^[1] and the "NULL Encryption Algorithm" in IPSec.^[2]

References

↑ "ciphers - SSL cipher display and cipher list tool.". OpenSSL. Retrieved 2014-12-10.
↑ RFC 2410 - The NULL Encryption Algorithm and Its Use With IPsec

Classical cryptography

Ciphers
by family

Caesar	Affine (Atbash) ROT13
Null	Null cipher (Null encryption)
One time pad	Book One-time pad
Polybius square	ADFGVX Bifid Tap code 3D (Trifid: Nihilist and VIC cipher)
Square	Two-square Four-square
Substitution cipher	Autokey Chaocipher Great Hill Keyword Running key
Transposition cipher	Rail fence cipher
Other	Alberti BATCO (Slidex) Beaufort Dvorak Enigma Elian Kama Sutra Navajo code Pigpen Playfair Polyalphabetic Rasterschlüssel 44 Reihenschieber Reservehandverfahren Scytale Smithy code Solitaire Straddling checkerboard Tabula recta Transposition Trithemius Vigenère

Cryptanalysis

Frequency analysis
Index of coincidence (Units: Ban and Nat)
Information leakage
Kasiski examination

Miscellaneous

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Null encryption

See also

References