@article{(Open Science Index):https://publications.waset.org/pdf/11364, title = {A Distinguish Attack on COSvd Cipher}, author = {Mohammad Ali Orumiehchi ha and R. Mirghadri}, country = {}, institution = {}, abstract = {The COSvd Ciphers has been proposed by Filiol and others (2004). It is a strengthened version of COS stream cipher family denoted COSvd that has been adopted for at least one commercial standard. We propose a distinguish attack on this version, and prove that, it is distinguishable from a random stream. In the COSvd Cipher used one S-Box (10×8) on the final part of cipher. We focus on S-Box and use weakness this S-Box for distinguish attack. In addition, found a leak on HNLL that the sub s-boxes don-t select uniformly. We use this property for an Improve distinguish attack. }, journal = {International Journal of Computer and Information Engineering}, volume = {1}, number = {11}, year = {2007}, pages = {3530 - 3533}, ee = {https://publications.waset.org/pdf/11364}, url = {https://publications.waset.org/vol/11}, bibsource = {https://publications.waset.org/}, issn = {eISSN: 1307-6892}, publisher = {World Academy of Science, Engineering and Technology}, index = {Open Science Index 11, 2007}, }