Stream Ciphers

Some articles on stream ciphers, cipher, ciphers, stream, stream cipher:

Disk Encryption Theory - Problem Definition
... it indirectly prohibits the use of stream ciphers, since stream ciphers require, for their security, that the same initial state not be used twice (which would be the case if a sector is updated with different data ... The alternative, a block cipher, is limited to a certain block size (usually 128 or 256 bits) ... well-known chaining modes unsuitable ECB mode, which cannot be tweaked, and modes that turn block ciphers into stream ciphers, such as the CTR mode ...
Linear Feedback Shift Register - Applications - Uses in Cryptography
... LFSRs have long been used as pseudo-random number generators for use in stream ciphers (especially in military cryptography), due to the ease of construction from simple ... intercept and recover a stretch of LFSR output stream used in the system described, and from that stretch of the output stream can construct an LFSR of minimal size ... This LFSR can then be fed the intercepted stretch of output stream to recover the remaining plaintext ...
Types of Stream Ciphers - Self-synchronizing Stream Ciphers
... Such schemes are known as self-synchronizing stream ciphers, asynchronous stream ciphers or ciphertext autokey (CTAK) ... digits are dropped or added to the message stream ... An example of a self-synchronising stream cipher is a block cipher in cipher feedback (CFB) mode ...
Stream Cipher
... In cryptography, 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 corresponding digit of the keystream, to give a digit of the cyphertext stream ... An alternative name is a state cipher, as the encryption of each digit is dependent on the current state ...

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