This question (update: now closed as duplicate) asks a basic thing: why the security level of 2DES is 57-bit (implicitly: given a few plaintext/ciphertext pairs). A helpful (if not quite correct) answer was given. Update 2: that answer was fixed.
The closer thing to a duplicate question seems to be this, asking why the meet-in-the-middle attack is considered to succeed in a maximum number of 2n+1 encryption operations for an n-bit key cipher, rather than 2n+2 for a simple implementation; with DES given as example. There's a good answer to that other question.
I hesitated between
- Voting to close the question as a duplicate. Update: I'm ready to bet that the OP will have a hard time figuring out things from a link to a more complex question with a detailed answer about a technicality of meet-in-the-middle attack, and two links to questions considering 3DES. The answer
, although not quite correct,is probably the most helpful one, but is going to disappear in oblivion if the question remains closed.
- Answering the question, and then
- doing so with another answer,
- or fixing the existing answer myself until it contains no false assertion,
- or (as I did) pointing in comment the logical error in the answer, hoping the answer to be fixed (which happened, but only after the question was closed, which is a timed death sentence for the answer).
What was the best action? Should the question be re-opened?