Pluto

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seen Oct 3 '13 at 15:36

Oct
3
comment Re-using parts of a one time pad to encrypt a new one?
I get the problem with it, but that's not what I meant to change, in reality, if the preshared key would be too short, you would first transmit the first 256 bits of the message, get a new 512 bit random number, and transmit the remainder. It's basically a way to use the pad as a tunnel through which to share new pads, without having to have either a lot of pads or requiring to use other channels to share new ones. The reusing just allows for a n-bit pad to transmit an n-bit new pad AND a 1/2n-bit message (or more than 1/2, you just need to re-use the pad multiple times to encrypt the new one)
Oct
3
comment Re-using parts of a one time pad to encrypt a new one?
I should have worded it better I think. Using regular one time pads, you, as well as the person you're sending the message to, need a lot of them to keep sending messages (entire books). Using this method, you can send a message, and attach a new pad to it. This means that you can keep sending messages, without the requirement of having tons of random numbers stored. You basically use half of the message for plain text and half (or even less, it shouldn't matter) to transmit the new pad, thereby avoiding insecure forms of communication.
Oct
3
awarded  Student
Oct
3
asked Re-using parts of a one time pad to encrypt a new one?