After the initial design was broken by Joux and Muller, a tweaked version named MOUSTIQUE was proposed which made it to Phase 3 of the eSTREAM evaluation process as the only self-synchronizing cipher remaining. However, MOUSTIQUE was subsequently broken by Käsper et al., leaving the design of a secure and efficient self-synchronising stream cipher as an open research problem.
Following the initial design's failure due to Joux and Muller, a revised version called MOUSTIQUE was introduced, successfully reaching Phase 3 of the eSTREAM evaluation process as the sole self-synchronizing cipher remaining. However, this design was later broken by Käsper et al., prompting further research into secure and efficient self-synchronizing stream ciphers.