國立臺灣大學資訊工程學系Lyuu, Yuh-DauhYuh-DauhLyuuWu, Ming-LuenMing-LuenWu2006-09-272018-07-052006-09-272018-07-052004http://ntur.lib.ntu.edu.tw//handle/246246/20060927122844445253Hwang & Chen recently proposed new multi-proxy multi-signature schemes that allow a group of authorized proxy signers to sign messages on behalf of a group of original signers. This paper shows that their schemes are insecure because a malicious proxy signer can forge a signature for a message secretly while participating in the message signing process with the other proxy signers.application/pdf216205 bytesapplication/pdfzh-TWCryptanalysis of and improvement on the Hwang–Chen multi-proxy multi-signature schemesreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/20060927122844445253/1/multisignature.pdf