[Resource Topic] 2006/297: Forward-Secure Signatures with Untrusted Update

Welcome to the resource topic for 2006/297

Forward-Secure Signatures with Untrusted Update

Authors: Xavier Boyen, Hovav Shacham, Emily Shen, Brent Waters


In most forward-secure signature constructions, a program that updates a user’s private signing key must have full access to the private key. Unfortunately, these schemes are incompatible with several security architectures including Gnu Privacy Guard (GPG) and S/MIME, where the private key is encrypted under a user password as a ``second factor’’ of security, in case the private key storage is corrupted, but the password is not. We introduce the concept of forward-secure signatures with untrusted update, where the key update can be performed on an encrypted version of the key. Forward secure signatures with untrusted update allow us to add forward security to signatures, while still keeping passwords as a second factor of security. We provide a construction that has performance characteristics comparable with the best existing forward-secure signatures. In addition, we describe how to modify the Bellare-Miner forward secure signature scheme to achieve untrusted update.

ePrint: https://eprint.iacr.org/2006/297

See all topics related to this paper.

Feel free to post resources that are related to this paper below.

Example resources include: implementations, explanation materials, talks, slides, links to previous discussions on other websites.

For more information, see the rules for Resource Topics .