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Is Transposition Cipher perfectly secure?How to prove it?

de flag

Is Transposition Cipher perfectly secure?How to prove it? I can't figure it out by comparing |M|and |K|

Eugene Styer avatar
dz flag
Think about what an attacker can determine from a short (say less than 10 character) message, even if the exact transposition used is unknown.
poncho avatar
my flag
Consider if you see the ciphertext of 'AAAAA'; what can you deduce about the plaintext?
Maarten Bodewes avatar
in flag
@EugeneStyer Other than that the message / plaintext is short, that's considered out of scope for these kind of theoretical questions about crypto (very much not in practical cryptography, but that's not what this is about).
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