Chaining of tokens

A server computer comprising:

• a processor;
• and
• a non-transitory computer readable medium comprising code, executable by the processor, for performing operations comprising:
• receiving a first request message from a client computer;
• responsive to receiving the first request message, inputting a plurality of static data elements, and a first pseudorandom value into a token generator function to produce a first authentication token;
• transmitting, to the client computer, a first response message comprising the first authentication token;
• receiving, from the client computer, a second request message comprising the first authentication token;
• responsive to receiving the second request message, inputting the first authentication token into a pseudorandom number generator to obtain a second pseudorandom value;
• inputting the second pseudorandom value and the plurality of static data elements into the token generator function to obtain a second authentication token;
• and
• transmitting a second response message comprising the second authentication token to the client computer, wherein the second authentication token is used for subsequent authentication with the server computer.

A method comprising:

• transmitting, by a client computer to a server computer, a first request message, wherein the server computer inputs a plurality of static data elements and a first pseudorandom value into a token generator function to produce a first authentication token, and transmits, to the client computer, a first response message comprising the first authentication token;
• receiving, by the client computer, the first authentication token;
• and
• transmitting, by the client computer to the server computer, a second request message comprising the first authentication token, wherein the server computer inputs the first authentication token into a pseudorandom number generator to obtain a second pseudorandom value, inputs the second pseudorandom value and the plurality of static data elements into the token generator function to obtain a second authentication token, and transmits a second response message comprising the second authentication token to the client computer, wherein the second authentication token is used for subsequent authentication with the server computer.