Question

Given the key: 1011111110101010100111000000001011001100011100001110000011110111 Which are the first TWO bits of the keystream produced by the...

Given the key:
1011111110101010100111000000001011001100011100001110000011110111
Which are the first TWO bits of the keystream produced by the A5/1 algorithm?

10
00
11
01

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Answer #1

Solution:

Option-C : 11 is the correct answer

The keystream produced by A5/1 algorithm, is by 11. With the knowledge of only 11 bits of the known keystream, the attack algorithm is able to determine a set of 64-bit complete state candidates which may contain the key.

So, the keystream produced by A5/1 by 11.

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