Most modern ATMs follow this same model, although the actual protocol has
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We can modify our ZK credential to support a limit of N shows as follows. First, let’s have the User select a random key K for a pseudorandom function (PRF), which takes a key and an arbitrary input and outputs a random-looking outputs. We’ll embed this key K into the signed credential. (It’s important that the Issuer does not learn K, so this often requires that the credential be signed using a blind, or partially-blind, signing protocol.3) We’ll now use this key and PRF to generate unique serial numbers, each time we “show” the credential.
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Motorola is also expanding its Moto Secure platform with a new feature, Private Image Data. This tool gives users greater control over the hidden data stored in their photos. When enabled, it automatically removes sensitive metadata from all new camera images on the device, helping protect details like location and device information. This protection runs quietly in the background, preserving the image itself while clearing some of the private data attached to it.