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Mozilla on CRLite

Submitted by Roy Schestowitz on Friday 10th of January 2020 03:16:02 AM Filed under
Moz/FF
Web
  • Introducing CRLite: All of the Web PKI’s revocations, compressed

    CRLite is a technology proposed by a group of researchers at the IEEE Symposium on Security and Privacy 2017 that compresses revocation information so effectively that 300 megabytes of revocation data can become 1 megabyte. It accomplishes this by combining Certificate Transparency data and Internet scan results with cascading Bloom filters, building a data structure that is reliable, easy to verify, and easy to update.

    Since December, Firefox Nightly has been shipping with with CRLite, collecting telemetry on its effectiveness and speed. As can be imagined, replacing a network round-trip with local lookups makes for a substantial performance improvement. Mozilla currently updates the CRLite dataset four times per day, although not all updates are currently delivered to clients.

  • The End-to-End Design of CRLite

    CRLite is a technology to efficiently compress revocation information for the whole Web PKI into a format easily delivered to Web users. It addresses the performance and privacy pitfalls of the Online Certificate Status Protocol (OCSP) while avoiding a need for some administrative decisions on the relative value of one revocation versus another. For details on the background of CRLite, see our first post, Introducing CRLite: All of the Web PKI’s revocations, compressed.

    To discuss CRLite’s design, let’s first discuss the input data, and from that we can discuss how the system is made reliable.

»

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