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How-To Geek

Cipher

In cryptography, both analog and digital, a cipher is an algorithm for transforming plaintext to ciphertext (unencrypted to encrypted) and reversing the process. A cipher could be as easy as shifting the vowels of the alphabet forward one (a shift-cipher) so that A becomes B and B becomes C, all the way around until Z because A. Modern encryption relies on radically more sophisticated ciphers that use advanced computations, split keys, and other cryptographic tricks only feasible with the aid of computers.

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