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Authentication method, client, server and system

  • US 8,239,679 B2
  • Filed: 11/19/2009
  • Issued: 08/07/2012
  • Est. Priority Date: 06/28/2007
  • Status: Active Grant
First Claim
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1. An authentication method, wherein a server stores a second key, the method comprising:

  • sending a challenge to a client by the server;

    obtaining a first key by the client;

    performing a transformation on the first key utilizing a local hash function to obtain a third key by the client;

    encrypting the first key and the challenge utilizing the third key to obtain a ciphertext by the client; and

    sending the ciphertext to the server by the client;

    decrypting the ciphertext utilizing the second key stored locally by the server;

    obtaining decrypted first key and decrypted challenge after decrypting the ciphertext, if the second key is the same as the third key by the server;

    performing a transformation on the decrypted first key utilizing a local hash function to obtain a fourth key by the server;

    passing an authentication of the client, if the decrypted challenge and the fourth key are respectively the same as the challenge sent by the server and the second key stored by the server.

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