Arrowhead Center, Inc.

Roopa Vishwanathan

Satyajayant Misra

Gaurav Panwar

Secure auditability of monitoring processing using public ledgers that are particularly useful for monitoring surveillance orders, whereby an overseeing enforcer ('E') checks if law enforcement agencies and companies are respectively over-requesting or over-sharing user data beyond what is permitted by the surveillance order, in a privacy-preserving way, such that E does not know the real identities of the users being surveilled, nor does E get to read the users' unencrypted data. Embodiments of the present invention also have inbuilt checks and balances to require unsealing of surveillance orders at the appropriate times, thus enabling accounting of the surveillance operation to verify that lawful procedures were followed, protecting users from government overreach, and helping law enforcement agencies and companies demonstrate that they followed the rule of law.

Scalable auditability of monitoring

Method and apparatus for efficient and authorized rewriting of records already written to a blockchain. Mutable transactions will make a fraction of all blockchain transactions, but will be a necessity to meet the needs of privacy regulations, for example the General Data Protection Regulation. Embodiments of the present invention provide an efficient framework for transaction-level blockchain rewrites that is fine-grained and supports revocation. Embodiments of the present invention provide a novel revocable chameleon hash with ephemeral trapdoor method and/or system, a novel revocable fast attribute-based encryption method and/or system, and a dynamic group signature method and/or system.

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Las Cruces, NM, United States of America

Roopa Vishwanathan