Data authentication method and agent based system

摘要

This invention relates to a data authentication method for authenticating data to be sent from a first agent to a second agent in agent based systems. The method is comprising the steps of: generating a random key by the first agent, handing over (10) the random key and an agent identification of the first agent to a trusted third party, saving the random key and the agent identification of the first agent by the trusted third party, creating a signature by generating (14) a unique identifying value from said data using an identifying value creating algorithm and encrypting (16) said unique identifying value using said random key by said first agent, sending (20) said data and said signature and said agent identification to the second agent, receiving said data and said signature and said agent identification by said second agent requesting said random key from said trusted third party by handing over said agent identification of the first agent received to the trusted third party by said second agent, handing over (30) said random key from said trusted third party to said second agent, generating (42) the unique identifying value from said data received from said first agent using said identifying value creating algorithm by said second agent, creating a decrypted signature by decrypting (40) said signature using said random key by the second agent and authenticating (44) said data by comparing said unique identifying value to said decrypted signature by said second agent.