Patterns — restrict

• Encryption with user-managed keys

  Use encryption in such a way that the service provider cannot decrypt the user's information because the user manages the keys.

• Aggregation Gateway

  Encrypt, aggregate and decrypt at different places.

• Anonymous Reputation-based Blacklisting

  Get rid of troublemakers without even knowing who they are.

• Attribute Based Credentials

  Attribute Based Credentials (ABC) are a form of authentication mechanism that allows to flexibly and selectively authenticate different attributes about an entity without revealing additional information about the entity (zero-knowledge property).

• Trustworthy Privacy Plug-in

  Aggregate usage records at the user side in a trustworthy manner.