Key Management Scheme based on Traditional Symmetrical Cryptogram System

This article mainly introduced one kind of key assignment scheme based on traditional symmetrical cryptogram system. It divides keys in system from lowers to high into three ranks - primary key, secondary key and the host master key. The primary keys cannot appear in the plaintext form, but are transmitted and preserved in the form of encryption. The secondary keys are deposited in the working register of special key device, and related encryption transformation operations are carried on in the special key device, so it has guaranteed that there was no information appeared in plaintext form beside the key equipment, thus provided one kind of safer key management scheme