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Scenarios

Key Transparency ensures, with mathematical certainty, that account owners can see all the public keys that have been used to authenticate their account or send them messages.

This assured-system architecture is useful in a variety of scenarios from end-to-end encryption to enterprise account management. Any scenario that involves authenticating users with public keys (eg. U2F) can significantly benefit from Key Transparency.

Scenario Description
Encrypted Messaging Key Transparency is ideal for user friendly end-to-end encrypted messaging. By making key management analogous to device management, users do not have to learn any new concepts, and no additional UI beyond device management is needed. Key management fits seamlessly into existing account life-cycle flows, and users are protected without requiring them to take additional actions.
Encrypted Storage Key Transparency can also be used to securely rotate the keys used for encrypted storage systems such as upspin.io
PGP Encrypted Email Key Transparency was initially built to solve the problem of public key lookup for PGP email encryption. KT has the potential to make PGP significantly more usable than the existing web-of-trust model.
Insider Risk Key Transparency removes the ability of privileged users to modify other user accounts without detection. This protects the privileged user from manipulation and ensures system safety even if the privileged user's account is compromised.
Post Compromise Security Audit By relying on mathematics, Key Transparency significantly reduces the trusted computing base (TCB) of an authentication system. This makes reasoning about the security properties of an enterprise under attack much easier. The system administrator can have certainty that the authentication records for all accounts are intact, and that users will be able to quickly correct any account compromise.
Cloud Adoption By employing a zero-trust architecture, Key Transparency provides efficient evidence to relying parties that the authentication system is operating correctly on an ongoing basis. This can increase cloud product adoption by removing one system from the list of systems that are difficult for customers to audit and control.
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