Secure, swift cryptographic key exchange

摘要

Using the present cryptographic key exchange protocol, a first of two cryptographic units selects quantities "A" and "B." That same unit then applies a mathematical function " PHI 1" to A and B to compute a third quantity "C.". A and B and the function PHI 1 posses the property that knowing A or B, and C, and the function PHI 1, it is mathematically impossible to compute the unknown quantity B or A. The first unit then transmits A together C to the second unit while retaining B. The second unit selects a fourth quantity "D" and then applies a second mathematical function PHI 2 to A and D to compute a quantity "E" which the second unit transmits to the first unit while retaining D. The quantities A and D and the function PHI 2 must posses the property that knowing D and E, and the function PHI 2, it is mathematically impossible to compute the unknown quantity D. Then the second unit applies a third mathematical function " PSI 2" to D and C to compute the secure key "K." The first unit upon receiving the quantity E then applies a fourth mathematical function PSI 1 to B and E to also compute the secure key K.