# Cipher

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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.
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This function returns plaintext {[x.sub.i]|i = 1, 2, ...,n} corresponding to cipher-text C using only the invertible matrix K as follows:
Encrypt (p,m [member of] {0,1}, [x.sub.i]): Suppose m be a plaintext such that m [member of] [member of] {0,1}.
Enc is an algorithm to encrypt a plaintext m and to output a ciphertext c.
information about the underlying plaintext. (23) In particular, it is
The use of XOR in the RC4 method is to compare plaintext binary numbers (unencrypted text) with pseudorandom bytes (binary).
Based on the secret key, the next stage is Pseudo Random Generator Algorithm (PRGA) that generates key stream bytes which XORed with the original bytes of plaintext to produce the cipher text [8].
In the first exploit, hackers can 'exfiltrate' emails in plaintext by exploiting a weakness inherent in Hypertext Markup Language (HTML), which is used in web design and in formatting emails.
Adaptive encryption uses the proposed AVX2-optimized Simeck32/64, and Simeck64/128 supports various block sizes for efficient data encryption of massive data according to the number of plaintext blocks.
Any adversary that only has [beta] and [gamma] without the private keys d and k very difficultly breaks the MVECC to get the plaintext M.
P,C,C': the 64-bit plaintext, ciphertext, and faulty ciphertext.

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