In particular I am unable to understand how “system services” can be both above and below “android runtime”, and what actually is that thing called “HAL”, which is mentioned about a thousand of times in the Google documentation, but never actually defined.
Chaum’s original constructions produce single-use credentials, based on a primitive known as a blind signature scheme. Blind signatures are a variant of digital signatures, with an additional protocol that allows for “blind signing” protocol. Here a User has a message they want to have signed, and the Server holds the signing half of a public/secret keypair. The two parties run an interactive protocol, at the end of which the user obtains a signature on their message. Most critically, the server learns nothing about the message that it signed.
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