Security of Enhancement of Adder in Stream Cipher System

The strength of the encryption system depends on the power of the key generator that produces a pseudorandom stream. The generator generates a pseudorandom sequence so passes several tests. The non-linear flow coding system that relies on the Adder function has several unwanted vulnerabilities. It leads to failure to face randomness tests and relative success in the correlation attack. In this paper, the Adder function was developed by adding a third offset register to improve its ability to bypass randomness tests. In addition to increasing the non-linear complexity of the generated chain, it is resistant to breaking the code using a link attack. Many sequences were applied to the improved Adder system, and good results were obtained.