A stream cipher is an encryption algorithm which encrypts arbitrary length plain text, using a (fixed length) key. Some stream ciphers generate a key stream from only the key, which is then XOR-combined with the plain text, others feed back plain text or cryptotext into the algorithm to create the ...
in the course of introduction to cryptography on coursera professor suggested treating all messages as a long stream XORing them with the key this way we will not need to change the key and will not ...
What attacks are there against stream ciphers? I found 2: Bit-flipping attack. Since every input bit mention exactly one output bit, it is possible to change ciphertext bits where the corresponding ...
Why RC4 used 24-bits constant value + 40 bits random values to generate key?
What I want to know is, Is there a stream cipher with two modes Mode-1 (encrypt/decrypt) and Mode-2 (decrypt/encrypt) i.e. it should be possible to encrypt and decrypt using Mode-1 and Mode-2 ...
If I don't err, in the literature a stream cipher is one in which each plaintext bit is processed individually, commonly via xor-ing with one bit of a random or pseudo-random bit stream, while a block ...