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Exam 2016 May
Spørsmål #79
Double DES is the encryption algorithm defined by iterating two instances of the DES algorithm — the initial DES ciphertext is fed back into the encryption algorithm with an independent key. The main disadvantage of double DES is:
it is vulnerable to differential cryptanalysis;
it has poor avalanche effects;
the key length is too short to resist practical brute-force search;
there is a meet-in-the-middle attack which reduces the effective key length.
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