Research And Design On Proxy Signature Scheme

Along with the development of compute and network communication technology,digital signature arises at the historic moment. The proxy signature is one kind ofspecial digital signature, because it is playingthe vital role in the practical application,as soon as presentedhas receivedthewidespread attention,manydomestic andforeignscholarshavecarriedonthethoroughdiscussionandresearchtoit.Firstly, this paper presents cryptanalysis for the typical proxy signature schemesand proposes the new scheme. The new scheme based on the elliptic curvecryptosystem, it has the merits of improved security, much less key-length, fasterspeed of disposal, much less system parameter and much less demand of bandwidth;moreover, The new scheme used the timestamp mechanism, solves the difficultproblemoftheproxysignaturewhichisnotofcontrollableproperty.Secondly, this paper presents cryptanalysis for the past proxy multi-signatureschemesandproposesakindofsafeandhighlyeffectiveproxymulti-signaturescheme.The new scheme solves some shortcomings of the past proxy multi-signature whichcan'tresistallprimitivesignerstoattacktogetherandisnotofcontrollableproperty.