Proxy Re-Signatures: New Definitions, Algorithms, and Applications.
Giuseppe Ateniese, Susan Hohenberger · 2005
In 1998, Blaze, Bleumer, and Strauss (BBS) proposed proxy re-signatures, in which a semitrusted proxy acts as a translator between Alice and Bob. To translate, the proxy converts a signature from Alice into a signature from Bob on the same message. The proxy, however, does not learn any signing key and cannot sign arbitrary messages on behalf of either Alice or Bob.