CPC H04L 63/0435 (2013.01) [H04L 63/06 (2013.01); H04L 63/08 (2013.01)] | 19 Claims |
1. A method for symmetric authentication by a first device, the method comprising:
generating a first challenge message containing a first string, wherein generating the first challenge message comprises inserting multiple instances of the first string in the first challenge message and an indicator of a number of the multiple instances;
encrypting the first challenge message;
transmitting the encrypted first challenge message to a second device;
receiving a first answer message from the second device;
decrypting the first answer message;
authenticating the second device based on determining the decrypted first answer message contains the first string;
upon successful authentication of the second device, the method further comprises:
receiving an encrypted second challenge message from the second device;
decrypting the encrypted second challenge message;
generating a second answer message containing a second string;
encrypting the second answer message; and
transmitting the encrypted second answer message to the second device.
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