ENCRYPTION-DECRYPTION KEY FORMING TECHNIQUE Russian patent published in 1997 - IPC

FIELD: cryptography; distribution of keys; building key distribution system resistant to desired number of compromises of personal keys of users to ensure confidential communication between any of their pairs. SUBSTANCE: confidential key is formed by selecting coefficients of symmetrical polynomials f_i(x₁,x₂) on the basis of random-number sensor, generation of personal confidential key for user by substituting user identifier in polynomials f_i(x₁,x₂), formation of session key by substituting user identifier in personal key. EFFECT: simplified hardware-software implementation basing on single standard microprocessor of high-speed session key formation system, reduced failure probability during input of personal key, simplified storage of key, improved resistance to external mechanical and electromagnetic effects. 2 tbl