Siemens Aktiengesellschaft

Volker Kessler

Martin Euchner

Guenther Horn

Wolfgang Klasen

Klaus Mueller

Klaus M&uuml;ller

Klaus Muller

G&uuml;nther Horn

The invention relates to a method which can be used to declare a session key (K) between a first computer unit (U) and a second computer unit (N) without it being possible for an unauthorized third party to obtain useful information regarding the keys or the identity of the first computer unit (U). This is achieved by embedding the principle of El-Gamal key interchange in the method with additional formation of a digital signature using a hash value whose input variable contains at least variables which can be used to infer the session key unambiguously.

Method and arrangement for the computer-aided exchange of cryptographic keys between a first computer unit and a second computer unit

The method provides that a session code (K) can be agreed between a first computer unit (U) and a second computer unit (N), without it being possible for any unauthorized third party to gain access to useful information relating to the codes or the identity of the first computer unit (U). This is achieved by embedding the principle of the El-Gamal code interchange in the method, with additional formation of a digital signature via a hash value of the session code (K) which is formed by the first computer unit (U).

Method for interchange of cryptographic codes between a first computer unit and a second computer unit

In a method for cryptographic code management between a first computer unit and a second computer unit, the method is divided into individual modular phases. Authentification references that are employed in further cryptographic phases are exchanged during an authentification of the first computer unit and the second computer unit. As a result thereof and due to the modular structure, a respectively new authentification actually required in the further cryptographic phases is no longer necessary and is also not implemented.

Process for cryptographic code management between a first computer unit and a second computer unit

Method for the computer-aided exchange of cryptographic keys between a

Process for group-based cryptographic code management between a first

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Vierkirchen, Germany

Volker Kessler