Creating and verifying globally unique device-specific identifiers

A method performed by a computing system comprising a first server and a second server, the second server being associated with a key, the method comprising:

• receiving, at the second server, a plurality of second identifiers associated with a client device;
• generating, by the second server, a token comprising an encrypted body comprising the plurality of second identifiers, the plurality of second identifiers being encrypted in the encrypted body, the token acting as a unique identifier of the client device;
• receiving, at the fist server, a plurality of first identifiers associated with the client device, and the token associated with the client device;
• attempting, by the first server, to decrypt the encrypted body of the token with the key associated with the second server to thereby decrypt the plurality of second identifiers;
• when the attempt to decrypt the encrypted body of the token is successful, comparing, by the first server, ones of the plurality of first identifiers with corresponding ones of the plurality of second identifiers to identify any inconsistencies therebetween;
• and
• determining, by the first server, token verification has failed when the attempt to decrypt the encrypted body of the token is unsuccessful, or inconsistencies between the ones of the plurality of first identifiers and the corresponding ones of the second plurality of identifiers are identified.

A method performed by a computing system associated with a key, the method comprising:

• receiving a plurality of second identifiers associated with a client device;
• generating a token comprising an encrypted body comprising the plurality of second identifiers, the plurality of second identifiers being encrypted in the encrypted body, the token acting as a unique identifier of the client device;
• receiving a plurality of first identifiers associated with the client device, and the token associated with the client device;
• attempting to decrypt the encrypted body of the token with the key to thereby decrypt the plurality of second identifiers;
• when the attempt to decrypt the encrypted body of the token is successful, comparing ones of the plurality of first identifiers with corresponding ones of the plurality of second identifiers to identify any inconsistencies therebetween;
• and
• determining token verification has failed when the attempt to decrypt the encrypted body of the token is unsuccessful, or inconsistencies between the ones of the plurality of first identifiers and the corresponding ones of the second plurality of identifiers are identified.