Authenticating a user with hash-based PIN generation

A system comprising:

• an authentication server comprising a processor and a memory;
• and
• an authentication logic on the memory, wherein upon execution of the authentication logic by the processor, the processor performs operations comprising:
• generating a server PIN based upon a current time, a device identifier, and a key, the device identifier being associated with a mobile device and being retrieved from a user database in response to receiving the key from a host server in communication with the mobile device, wherein the key is received along with a device PIN from the host server, wherein generating the server PIN comprises
• computing a hash value based upon the current time, the device identifier, and the key, and
• parsing the hash value using one of an odd and an even function to generate the server PIN, wherein the server PIN is limited to a defined length, and
• determining a match between the server PIN and the device PIN received from the host server to authenticate the mobile device in communication with the host server across a network.