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CIPHER. An arithmetical character, used for numerical notation. Vide Figures, and 13 Vin. Ab. 210; 18 Eng. C. L. R. 95; 1 Ch. Cr. Law, 176.
     2. By cipher is also understood a mode of secret writing. Public ministers and other public agents frequently use ciphers in their correspondence, and it is sometimes very useful so to correspond in times of war. A key is given to each minister before his departure, namely, the cipher for writing ciphers, (chiffre chiffrant,) and the cipher for deciphering (chiffre dechiffrant.) Besides these, it is usual to give him a common cipher, (chiffre banal,) which is known to all the ministers of the same power, who occasionally use it in their correspondence with each other.
     3. When it is suspected that, a cipher becomes known to the cabinet where the minister is residing, recourse is had to a preconcerted sign in order to annul, entirely or in part, what has been written in cipher, or rather to indicate that the contents are to be understood in an inverted or contrary sense. A cipher of reserve is also employed in extraordinary cases.

References in periodicals archive ?
That is, recipients can not distinguish whether received ciphertext is the encryption by public key of recipient directly or re-encrypted by the proxy.
Encryption is carried out according to A and the ciphertext CT is the output.
The simulation results suggest that the decrypted ciphertext will become a monotone white text if a key stream is used with different seeds generated by CPRNG to decrypt the ciphertext.
Avalanche Effect of the AES-2SBox Plaintext Ciphertext Avalanche Effect 111111111111111 FE88B9C6D624C 24.
Based on the additively homomorphic property, the cryptosystem allows to rerandomize a ciphertext by computing a random encryption of the product of the ciphertext and the constant number 1.
Together, the moves and annotations relate the story to the chess board; which is what a key does for a plaintext and a ciphertext.
It would be desirable to have an acceptably secure encryption process that would render a database of identifying information useless to an attacker without a key, but that would produce ciphertext in the same formatas the plaintext.
Here, x is the numerical representation of a plaintext letter, y is the numerical representation of the ciphertext letter, a is the multiplicative key, and b is the additive key.
Inside the unit, the message is encrypted and delivered to the Ciphertext port, from which it goes out to the modem.
The ciphertext string of A and B values was then parsed into groups of five and deciphered as follows:
128 bit key length or longer) is utilized to convert clear data (plain text) into an unreadable form called ciphertext, which cannot be deciphered without the decryption key.