Guided Frame (Tensor G2 and newer): For blind or low-vision people, the camera app can now help take a selfie with audio cues (it works with the front and rear cameras). You'll need to enable TalkBack for this to work (Settings Accessibility TalkBack). Then open the camera app. It will automatically help you frame the shot.
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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