Changes between Version 7 and Version 8 of A5-GMR-1

Timestamp:

04/26/12 08:50:32 (14 months ago)

Author:

sylvain

Comment:

--

A5-GMR-1

@@ -63 +63 @@
 Both known-plaintext and ciphertext-only variants have been implemented.
 
-The first variant uses the known FACCH3 plaintext. If you have at least 8 consecutive known bursts (or just 4 burts but with the right alignment of frame numbers), the key can be recovered with as little as 42 Mo of storage and in no more than 500 ms. If only 4 known plaintext bursts are available, offline tables are required for every possible FN-XOR, raising the offline storage requirement to 2.1 Go.
+The first variant uses the known FACCH3 plaintext. If you have at least 8 consecutive known bursts (or just 4 burts but with the right alignment of frame numbers), the key can be recovered with as little as 42 Mo of offline storage and in no more than 500 ms. If only 4 known plaintext bursts are available, offline tables are required for every possible FN-XOR, raising the offline storage requirement to 2.1 Go.
 
 The second variant uses the redundancy within FACCH3 to build a ciphertext only attack. It requires 8 consecutive ciphered bursts belonging to two L2 frames. It requires about 5 Go of offline table and takes roughly 1 second to recover the key.