Monday, February 19, 2018

Fingerprint readers are returning:
We were discussing identity management without login screens.
We elaborated on the following three components as necessary for the alternatives:
1) user knowledge based component
2) server issued dynamic component
3) convenience factor
Biometrics becomes an important convenience factor for identity management when the technology to read them does not remain as restricted as they have been.
For example, Civic identity management which is based on blockchain ledger enables users to login with their fingerprints. There are a few technological advancements that's fueling this trend to return.
First, the erstwhile fingerprint reader devices are no longer space constrained. Today these readers can be part of the visual display of the screen and yet remain unintrusive for the most part. The world's first phone with a fingerprint scanner built into the display is now out. By embedding the fingerprint sensors into the displays, they are now more robust than they were with the earlier readers. Fingerprints have long been associated with the highest form of convenience but they were not fully utilized due to the limitations of the readers. They improved convenience by reducing the login experience to one-touch.
Second, the availability of a distributed ledger does away with a password database, This form of improvement enabled Civic to allow users to be recognized merely by their thumbprint while the digital identity was attested.
The mechanics of attestation is now achieved with a Merkle tree where the root hash is converted to a valid block chain address using the additive property of the Elliptic Curve Cryptography:
  k-priv + h = kattest
This allows the privacy for both the user and the validator to be protected.
#Merkel tree
every leaf node has hash of associated data block
every non leaf node has hash of labels of leaf nodes


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