METHOD FOR GENERATING PARAMETER OF PUBLIC KEY INFRASTRUCTURE

摘要

The present invention relates to a method for automatically generating a parameter based on a public key. According to the method, a shared attribute shared between users is defined, the shared attribute is function-processed to output a hash function value, a preset bit value is determined from the hash function value, a prime number closest to the bit value is defined as a prime number p, and it is determined whether calculated values of the prime number p and a primitive root a can be used as Diffie-Hellman parameters, provided that the value of the primitive root a is 5 or 2, so as to define the primitive root a. According to the present invention, a secret key is generated and managed in advance through a shared attribute for an operation performed for key exchange between users, so that an operation time for generating the secret key can be reduced, and thus a time required for the key exchange can be reduced in real time.