SECRET KEY GENERATING METHOD, ENCRYPTION METHOD AND ENCRYPTION COMMUNICATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide an encryption communication method which adopts ID- NIKS where the scale of a mathematical structure is minimized, a coalition problem can be avoided and building of the encryption system is facilitated. SOLUTION: In this encryption communication method, a plurality of centers 1 that distribute a specific secret key to each entity are provided, specific information (ID information) for each entity is divided into several parts, and all private keys generated for divided specific information parts are distributed to the entities. Each entity uses a component corresponding to the divided specific information of an opposite side entity included in a secret key specific to each entity to generate a common key.