Verfahren zum digitalen Signieren von Dokumenten und zur Pruefung der digitalen Signatur

Bei einem Verfahren zum digitalen Signieren von Dokumenten ist vorgesehen, dass von einem zu signierenden Dokument unter Anwendung voneinander verschiedener Hashfunktionen mehrere Hashwerte gebildet werden, aus denen mindestens eine Signatur durch Anwendung eines geheimen Schluessels abgeleitet wird.

WO2004034635 A UPAB: 20040511 NOVELTY - The method involves producing several hash values (h1-h4) from a document (m) to be signed using mutually different hash functions and producing at least one signature (S) from the hash values using a private key. The hash values for signature computation are combined in a data object that is encoded using an asymmetric technique so that the hash values can be recovered by decoding the data object with a public key DETAILED DESCRIPTION - AN INDEPENDENT CLAIM is also included for the following: (a) a method of verifying a signature produced in accordance with the inventive method (b) a method of verifying a signal made up of sub-signatures (c) and a method of checking a signature. USE - For digitally signing documents. ADVANTAGE - The validity of the method is maintained over a long period.