Authentication using mutable data

A computer-implemented method, comprising:

• storing, in a database, first mutable authentication data in association with an identifier of a client;
• receiving a request for authentication of the client, the request including second mutable authentication data stored in the client;
• comparing the first mutable authentication data in the database with the second mutable authentication data;
• and
• in response to determining that the first mutable authentication data matches the second mutable authentication data:
• generating third mutable authentication data that is different from the first mutable authentication data;
• storing, in the database, the third mutable authentication data in association with the identifier of the client;
• and
• transmitting the third mutable authentication data for storage in the client.

A system, comprising:

• one or more storages including an identifier and first mutable authentication data;
• and
• a processor for executing instructions that cause the processor to:
• transmit a first request for authentication along with the first mutable authentication data;
• upon a success of the first request for authentication:
• receive second mutable authentication data that is different from the first mutable authentication data;
• and
• store the second mutable authentication data in the one or more storages;
• and
• transmit a second request for authentication along with the second mutable authentication data.