Hot answers tagged one-time-pad
5
Firstly, I presume this is not something you are going to use for protecting data in any kind of real life scenario, but are only asking out of curiosity.
Secondly, just to get the terminology straight and avoid confusion, what gives an OTP cryptographic scheme information theoretic security is that it meets both of the following two criteria:
The key ...
3
This is highly insecure.
For instance, if you see the word guyk in the ciphertext, what could the corresponding plaintext word be?
With your scheme (where each letter is enciphered by adding a number between 0..9 to it modulo 26), there are only 139 English words that could have led to it. (Those 139 possibilities are things like arse, blue, bore, both, ...
1
The adversary $\mathcal A$ is an entity (think of a computer program) designed to participate in the experiment $\operatorname{PrivK}^{\text{eav}}_{A,\Pi}$.
So the adversary produces two messages, then is given the encryption of one of them, and has to guess which one it was.
Of course, you can give the adversary other "ciphertexts" too, but this wouldn't ...
1
One problem is that keyboard keys may or may not be uniform. Look at the F and J keys - they may have a little dot of plastic to identify them with your fingertips. That little dot may make them heavier or lighter than other keys, affecting how they shake up in a hat. Some keyboards, like Das Keyboard, were built with different spring actions for different ...
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