Computer Science · Cryptography

Which of the following statements is/are TRUE about encryption techniques? A. In symmetric key cryptography, the secrecy/protection of the key generating function must be of higher level than the decrypting function. B. The DES technique works by taking 64 bit chunk value and 56 bit key over a series of transformations. C. The Twofish symmetric block algorithm works on variable key length of upto 256 bits over a block of 128 bits. D. RC4 is the most commonly used stream cipher that encrypts & decrypts a stream of bits/bytes instead of blocks. Choose the correct answer from the options given below: