0

I know that a one-time pad requires a non-repeating key at least equal to the length of the message to encode, but I have no idea how (or if it is even possible) to decode such a message using a one time pad. Does anyone have any ideas?

SwaroopGiwali
  • 101
  • This is off-topic. With a OTP you typically decrypt the ciphertext with the same key and reverse the method that you used to encrypt the plaintext - see the [Wikipedia article](http://en.wikipedia.org/wiki/One-time_pad#Example) – RedGrittyBrick Oct 01 '12 at 23:57
  • You need to know how the one-time pad was convolved with the input source. It may have been a simple bit-wise XOR, in which case you just XOR again. Or it may have been something a bit more complex. – Daniel R Hicks Oct 02 '12 at 00:46
  • You have get more luck asking http://security.stackexchange.com/ – Dave Oct 02 '12 at 08:07

1 Answers1

2

Do it the same way it was encrypted, but backwards.

Ignacio Vazquez-Abrams
  • 111,361
  • 10
  • 201
  • 247
  • With the most common kind of one-time-pad, you use xor to combine keystream and text which is even identical in both directions. – CodesInChaos Oct 26 '12 at 12:27