Kangaroo a proposed stream cipher algorithm

الملخص EN

Stream cipher designers offer new algorithms by employing the characteristics of the basic structure to get algorithms that have advanced features from security and speed stand point of view.

Taking into consideration the benefit from the scientific and technical development at the publish time of their algorithms versions.

This research proposes the design of a new efficient and secure stream cipher, named (Kangaroo) which was designed to be more secure than conventional stream cipher systems that use XOR for mixing.

The proposed algorithm encompasses two major components.

The first part involves the Pseudo Random Number Generator (PRNG) using Rabbit algorithm.

And the second part involves a nonlinear invertible round function (combiner) to perform the encryption and decryption processes.

This will lead to strengthen the weak XOR combiner.

The proposed cipher is not a random number generator alone.

Instead it is self-synchronizing stream cipher such that - the cipher text influences its internal functioning.

The proposed algorithm uses 16-bytes secret key to encrypt the plaintext which is multiple of 16-bytes up to (264 bytes) length.

Also the performance and memory requirements of the proposed system are evaluated.

Such that the setup stage requires 1987 operations and the encryption / decryption processes require 4 operations per byte.

And the memory requirement is 344 bytes.

The implementation was done on a (Pentium IV, 1.79 GHz, 224 MB of RAM) PC, Windows XP, using (Java Builder 7).