Chapter 2 Question

The “one-time pad” cipher which is attributed to Joseph Mauborgne, is perhaps one of the most secure forms of cryptography. If a security company you worked for wanted to use this and was asking for your opinion what would you say?

Solution

  • the one-time pad is a type of encryption which has been proven to be impossible to crack if used correctly.
  • Each character from the plaintext is encrypted by a modular addition with a character from a secret random key (or pad) of the same length as the plaintex
  • Problems:
    1. Key must be as big as the message
    2. Key must be TRULY random (not pseudo random)
    3. Key is useful only once
    4. Key must be distributed
Topic revision: r2 - 2013-12-18 - JimSkon
 
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