3DES runs the second round backwards, which enables the "meet in the middle" attacks.
You mean because the second key is used with the decryption operation? Why would a meet in the middle attack not be possible if three encryption operations were used?
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3DES runs the second round backwards, which enables the "meet in the middle" attacks.
You mean because the second key is used with the decryption operation? Why would a meet in the middle attack not be possible if three encryption operations were used?