The welch-gong stream cipher - evolutionary path

On Welch-Gong Transformation Sequence Generators

Welch-Gong (WG) transformation sequences are binary sequences of period 2 − 1 with 2-level auto correlation. These sequences were discovered by Golomb, Gong and Gaal in 1998 and verified for 5 ≤ n ≤ 20. Later on, No, Chung and Yun found another way to construct the WG sequences and verified their result for 5 ≤ n ≤ 23. Dillon first proved this result for odd n in 1998, and finally, Dobbertin an...

Cryptographic properties of the Welch-Gong transformation sequence generators

Welch–Gong (WG) transformation sequences are binary sequences of period 2 1 with two-level autocorrelation. These sequences were discovered by Golomb, Gong, and Gaal in 1998 and they verified the validity of their construction for 5 20. Later, No, Chung, and Yun found another way to construct the WG sequences and verified their result for 5 23. Dillon first proved this result for odd in 1998, a...

The rakaposhi Stream Cipher

In this paper, we introduce the rakaposhi stream cipher. The algorithm is based on Dynamic Linear Feedback Shift Registers, with a simple and potentially scalable design, and is particularly suitable for hardware applications with restricted resources. The rakaposhi stream cipher offers 128-bit security, and aims to complement the current eSTREAM portfolio of hardware-oriented stream ciphers.

The Stream Cipher Rabbit

1 This is version 1.1 of the cipher specification as submitted to the eStream project. The only changes in comparison to version 1.0 are some additions to section 7 on computational efficiency and a new appendix A, which describes an 80-bit key setup.

The Achterbahn Stream Cipher