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Serpent is a symmetric key block cipher that was a finalist in the Advanced Encryption Standard (AES) contest, in which it ranked second to Rijndael. [2] Serpent was designed by Ross Anderson, Eli Biham, and Lars Knudsen. [3] Like other AES submissions, Serpent has a block size of 128 bits and supports a key size of 128, 192, or 256 bits. [4]
The Shamir algorithm uses exponentiation modulo a large prime as both the encryption and decryption functions. That is E(e,m) = m e mod p and D(d,m) = m d mod p where p is a large prime. For any encryption exponent e in the range 1..p-1 with gcd(e,p-1) = 1. The corresponding decryption exponent d is chosen such that de ≡ 1 (mod p-1).
The subkeys are chosen in a pre-specified order. The key schedule is very simple: break the 256-bit key into eight 32-bit subkeys, and each subkey is used four times in the algorithm; the first 24 rounds use the key words in order, the last 8 rounds use them in reverse order. The S-boxes accept a four-bit input and produce a four-bit output.
Since encryption of each digit is dependent on the current state of the cipher, it is also known as state cipher. In practice, a digit is typically a bit and the combining operation is an exclusive-or (XOR). The pseudorandom keystream is typically generated serially from a random seed value using digital shift registers.
Threefish is a symmetric-key tweakable block cipher designed as part of the Skein hash function, an entry in the NIST hash function competition.Threefish uses no S-boxes or other table lookups in order to avoid cache timing attacks; [1] its nonlinearity comes from alternating additions with exclusive ORs.
In cryptography, learning with errors (LWE) is a mathematical problem that is widely used to create secure encryption algorithms. [1] It is based on the idea of representing secret information as a set of equations with errors. In other words, LWE is a way to hide the value of a secret by introducing noise to it. [2]
The first version of HEAAN was published on GitHub [2] on 15 May 2016, and later a new version of HEAAN with a bootstrapping algorithm [3] was released. Currently, the latest regular version is version 1.1 [ 4 ] and the latest pre-release version is 2.1.
The Signal Protocol has had an influence on other cryptographic protocols. In May 2016, Viber said that their encryption protocol is a custom implementation that "uses the same concepts" as the Signal Protocol. [44] [45] Forsta's developers have said that their app uses a custom implementation of the Signal Protocol. [46] [47] [third-party ...