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Cryptanalysis of GSM Ciphers | ||
| Al-Rafidain University College For Sciences | ||
| Article 1, Volume 0, Issue 21, 2017, Pages 118-127 | ||
| Author | ||
| Khalid F. Jassim | ||
| Abstract | ||
| The stream cipher Algorithm A5 used to encrypt GSM telephone communication. The Algorithm A5 consists of three versions (A5/1, A5/2 and A5/3). In the current standard protocol the three algorithms share the same secret key. Thus in this paper we select the weakest algorithm A5/2, attack the algorithm and extract the secret key in a cipher text-only attack, using the weaknesses of the cipher and majority functions. Then using the secret key to decrypt the communication even encrypted under the algorithms A5/1 and A5/3. | ||
| Keywords | ||
| Cryptanalysis | ||
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