SOBER

In cryptography, SOBER is a family of stream ciphers initially designed by Greg Rose of QUALCOMM Australia starting in 1997.

The ciphers evolved, and other developers (primarily Phillip Hawkes) joined the project.

SOBER was the first cipher, with a 17-byte linear-feedback shift register (LFSR), a form of decimation called stuttering, and a nonlinear output filter function.

t32 was a further expansion to 32-bit words, while both ciphers had a more efficient method of computing the linear feedback.

The stuttering was dropped because it added too little strength for the overhead, and the nonlinear output function was strengthened.