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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.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in classic literature ?
"Because there are many ciphers which I would read as easily as I do the apocrypha of the agony column: such crude devices amuse the intelligence without fatiguing it.
Release date- 30072019 - OAKVILLE - Cipher Pharmaceuticals Inc.
have proved that they found almost all impossible differentials of a block cipher [13].
17 December 2018 - Spain-based security company Prosegur has agreed to acquire a majority stake in US-based cybersecurity company Cipher to strengthen Prosegur's capabilities in cybersecurity, the company said.
The sender uses some encryption algorithms and shared key to converting plain text into cipher text whereas, the receiver converts the ciphered text into plain text using the decryption algorithm with the key shared by the sender.
Swedish pharmaceutical company Moberg Pharma AB (STO:MOB) announced on Tuesday the signing of an exclusive license agreement with Cipher Pharmaceuticals (Cipher) (TSX:CPH), a specialty pharmaceutical company, for MOB-015 in Canada.
When you use SSL (specially the versions prior to TLS1.2) and if you have configured the stream cipher RC4 as a cipher in SSL then you are vulnerable to some attacks which are mainly based on the in-variance weakness of the RC4 algorithm.
Cipher expects to finance this acquisition with a combination of cash and new debt.
"Cracking Codes with Python" also shows how to: Combine loops, variables, and flow control statements into real working programs; Use dictionary files to instantly detect whether decrypted messages are valid English or gibberish; Create test programs to make sure that your code encrypts and decrypts correctly; Code (and hack!) a working example of the affine cipher, which uses modular arithmetic to encrypt a message; Break ciphers with techniques such as brute-force and frequency analysis.
MarketsandMarkets selected CIPHER for its innovative range of security system integration services across the banking, financial, healthcare, hospitality, education, legal, and retail verticals.
RtTech's Cipher software delivers on the IIoT promise of affordable, high performance connectivity for old, new, local and remote assets, without having to rip out and replace existing IT/OT (information technology/operational technology) infrastructures or business systems.
In this section, we describe works related to Simeck family block cipher and Intel AVX2 SIMD and works related to human care service security.