Provable security. The goal of provable security is to verify rigorously the security of cryptographic systems. A provable security argument proceeds in three steps:

  1. Define a security goal and an adversarial model;
  2. Define the cryptographic system and the security assumptions upon which the security of the system hinges;
  3. Show by reduction that any attack against the cryptographic system can be used to build an efficient algorithm that breaks a security assumption.