Fingerprinting Methods
The problem with fingerprinting a mobile device is that to be effective, fingerprinting characteristics must be diverse enough to be unique. Uniqueness based on diversity is the best way to ensure that no two devices have the same fingerprint. This is not always an easy thing to achieve, however—especially with iPhones, which are closed systems with factory-set configurations.
A mobile device must also be stable. That is, its fingerprint must remain unique over time. Some sets of identifiers may be unique at any given time, but if the characteristics can be easily changed by a user, then they cannot be considered stable. If a fingerprint is not stable, then it cannot be used to track a user over time, which is the whole ...
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