WebIn this paper we propose a Guess-and-Determine based initial state recovery attack on Polar Bear, one of the ECRYPT stream cipher project candi-dates. The computational complexity and success proba ... WebDec 24, 2011 · One simple type of stream ciphers is the binary additive stream ciphers with a keystream generator based on permutations, which was proposed in [4, Section 11.4]. As shown in Fig. 1 , the keystream generator consists of a GF(2 n )-generator, a permutation function over GF(2 n ) with good nonlinearity and a linear function from GF(2 n ) to GF(2).
ISO - ISO/IEC 18033-4:2005 - Information technology — Security ...
In the most common form, binary digits are used ( bits ), and the keystream is combined with the plaintext using the exclusive or operation (XOR). This is termed a binary additive stream cipher . In a synchronous stream cipher, the sender and receiver must be exactly in step for decryption to be successful. See more A stream cipher is a symmetric key cipher where plaintext digits are combined with a pseudorandom cipher digit stream (keystream). In a stream cipher, each plaintext digit is encrypted one at a time with the … See more Binary stream ciphers are often constructed using linear-feedback shift registers (LFSRs) because they can be easily implemented in hardware and can be readily analysed mathematically. The use of LFSRs on their own, however, is insufficient to … See more For a stream cipher to be secure, its keystream must have a large period, and it must be impossible to recover the cipher's key or internal state from the keystream. Cryptographers … See more Stream ciphers can be viewed as approximating the action of a proven unbreakable cipher, the one-time pad (OTP). A one-time pad uses a keystream of completely See more A stream cipher generates successive elements of the keystream based on an internal state. This state is updated in essentially two ways: if the state changes independently of the plaintext or ciphertext messages, the cipher is classified as a synchronous … See more Instead of a linear driving device, one may use a nonlinear update function. For example, Klimov and Shamir proposed triangular functions (T-functions) with a single cycle on n-bit words. See more Stream ciphers are often used for their speed and simplicity of implementation in hardware, and in applications where plaintext comes in quantities of unknowable length like a secure wireless connection. If a block cipher (not operating in a stream cipher … See more Weba binary additive stream cipher. There is abundant theoretical knowledge on stream ciphers, and various design principles for stream ciphers have been proposed and extensively analyzed. For instance, in the modern stream ciphers, a secret key accompanied with a public initialization vector (IV) are used fitclub south hours
ISO - ISO/IEC 18033-4:2005 - Information technology — Security ...
WebStream ciphers are symmetric encryption algorithms based on the concept of pseudorandom keystream generator. In the typical case of a binary additive stream cipher, the key and an additional parameter named initialization vector (IV) are used to generate a binary sequence called keystream which is bitwise WebThe stream cipher is referred to as the binary additive stream cipher based on the inverse permutation. They analyzed the linear complexity stability, autocorrelation and … WebA binary additive stream cipher generates a stream of pseudo-random symbols, called the keystream, Z, based on a secret key Kand an initialization vector, IV [38]. To encrypt, … fit club studios whetstone