A5/2
Encyclopedia : A : A5 : A52 : A5/2
A5/2 is a stream cipher used to provide voice privacy in the GSM cellular telephone protocol.
The cipher is based around a combination of four linear feedback shift registers with irregular clocking and a non-linear combiner.
In 1999, Ian Goldberg and David Wagner cryptanalyzed A5/2 in the same month it was published, and showed that it was extremely weak — so much so that low end equipment can probably break it in real time.
See also
| Stream ciphers [edit] |
| Algorithms: A5/1 | A5/2 | FISH | Grain | HC-256 | ISAAC | MUGI | Panama | Phelix | Pike | Py | Rabbit | RC4 | Salsa20 | Scream | SEAL | SOBER | SOBER-128 | SOSEMANUK | Trivium | VEST | WAKE |
| Theory: Shift register | LFSR | NLFSR | Shrinking generator |
| Misc: eSTREAM |
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