"An encryption algorithm designed to protect calls on
GSM phones has been broken by three cryptographers using only a
dual-core, Intel -based Dell Latitude PC running Linux.
"In a just-released paper, the three researchers from the
Weizmann Institute of Science in Rehovot, Israel, described a
technique they developed called a "sandwich attack," which they
used to derive the complete 128-bit key of the Kasumi encryption
algorithm. Kasumi, otherwise known as A5/3, is the block cipher
used to encrypt communications on 3G wireless networks."