How large q can be so that the block cipher is still safe

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Reference no: EM132128978

We have seen that a Block cipher such as AES is insecure if an attacker can have a very large number of chosen plain-text messages (e.g.2 50 messages) for which he gets the corresponding cypher-text.

Suppose that we consider the block cipher secure if the probability of recovering the key by the attack in theorem 4.1 is less than 2 (-50) .

Determine how large Q can be so that the block cipher is still safe.

Reference no: EM132128978

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