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also cy·pher (sī′fər)
1. The mathematical symbol (0) denoting absence of quantity; zero.
2. An Arabic numeral or figure; a number.
3. One having no influence or value; a nonentity.
a. A cryptographic system in which units of text of regular length, usually letters, are transposed or substituted according to a predetermined code.
b. The key to such a system.
c. A message written or transmitted in such a system.
5. A design combining or interweaving letters or initials; a monogram.
v. ci·phered, ci·pher·ing, ci·phers also cy·phered or cy·pher·ing or cy·phered
To solve problems in arithmetic; calculate.
1. To put in secret writing; encode.
2. To solve by means of arithmetic.

[Middle English cifre, from Old French, from Medieval Latin cifra, from Arabic ṣifr, from ṣafira, to be empty (translation of Sanskrit śūnyam, cipher, dot); see ṣpr in Semitic roots.]
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References in classic literature ?
As to Tom, Charley's brother, I am really afraid to say what he did at school in ciphering, but I think it was decimals.
The already recommended algorithm is AES which has some sort of disabilities which have been discussed above so, to overcome the disadvantages of using AES, the RC4 algorithm is recommended for the secure burst switching and the key generation for the ciphering is done with Quantum Key Distribution (QKD).
Because of this limitation these boards are unable to apply any high-level ciphering, which can achieve good security for all transmitted data.
For each mode implemented, selections are available for key sizes (128 bit, 192 bit, 256 bit) supported as well as the ciphering direction (i.e., encryption and decryption).