METHOD AND ARRANGEMENT FOR THE COMPUTER-AIDED EXCHANGE OF CRYPTOGRAPHIC KEYS BETWEEN A FIRST COMPUTER UNIT AND A SECOND COMPUTER UNIT

摘要

The invention relates to a method for agreeing a session key (K) between a first computer unit (U) and a second computer unit (N) without an unauthorised third party being able to obtain useful information regarding the key or the identity of the first computer unit (U). To this end, the El-Gamal key exchange principle is incorporated in the method, with the additional formation of a digital signature with a hash value whose input variable has at least variables from which the session key can be clearly deduced.