Method of generating a stream cipher using multiple keys

摘要

In symmetric methods of encryption the stream cipher should be as long as the plaintext message. Such a cipher is difficult to generate if the plaintext data to be encrypted is enormous. The present invention provides a method of generating a stream cipher of variable length which may be extremely long. It is generated by creating a number of random sub-keys having non-repeating lengths and combining such sub-keys in a random way.