The Hierarchy of Key Evolving Signatures and a Characterization of Proxy Signatures.

Tal Malkin Satoshi Obana Moti Yung The Hierarchy of Key Evolving Signatures and a Characterization of Proxy Signatures. 306-322 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3027&spage=306 2004 conf/eurocrypt/2004 EUROCRYPT db/conf/eurocrypt/eurocrypt2004.html#MalkinOY04