Data Protection and Security

I

Introduction To Cryptography

I.IV

One-Time Pad

Perfect Secrecy

Computationally secure: The most efficient known algorithm for breaking a cipher would require far more computational steps than any hardware available to an opponent can perform. Most crypto algorithm in use today are computationally secure.

Unconditionally secure: The opponent has not enough information to decide whether one plaintext is more likely to be correct than another, even if unlimited computational power were available.

I.IV.Q