计算机应用与软件
計算機應用與軟件
계산궤응용여연건
COMPUTER APPLICATIONS AND SOFTWARE
2014年
12期
307-310
,共4页
可变门限代理重签名%单向性%中国剩余定理%标准模型%可证明安全
可變門限代理重籤名%單嚮性%中國剩餘定理%標準模型%可證明安全
가변문한대리중첨명%단향성%중국잉여정리%표준모형%가증명안전
Variable threshold proxy re-signature%Unidirectional%Chinese remainder theorem%Standard model%Security provable
现有的绝大多数门限代理重签名方案只有一个门限值，但在实际应用中，门限代理重签名体制中联合重签名的代理者个数（门限值）取决于重签名消息的重要性。在Sherman等人提出的代理重签名方案的基础上，利用中国剩余定理提出一个在标准模型下可证明安全的单向可变门限代理重签名方案。分析结果表明，新方案在计算性Diffie-hellman假设下满足强壮性和不可伪造性；在效率上优于已有的同类签名方案。根据可变的门限值，每个代理者都能非交互地生成相应的重签名子密钥和验证公钥。
現有的絕大多數門限代理重籤名方案隻有一箇門限值，但在實際應用中，門限代理重籤名體製中聯閤重籤名的代理者箇數（門限值）取決于重籤名消息的重要性。在Sherman等人提齣的代理重籤名方案的基礎上，利用中國剩餘定理提齣一箇在標準模型下可證明安全的單嚮可變門限代理重籤名方案。分析結果錶明，新方案在計算性Diffie-hellman假設下滿足彊壯性和不可偽造性；在效率上優于已有的同類籤名方案。根據可變的門限值，每箇代理者都能非交互地生成相應的重籤名子密鑰和驗證公鑰。
현유적절대다수문한대리중첨명방안지유일개문한치，단재실제응용중，문한대리중첨명체제중연합중첨명적대리자개수（문한치）취결우중첨명소식적중요성。재Sherman등인제출적대리중첨명방안적기출상，이용중국잉여정리제출일개재표준모형하가증명안전적단향가변문한대리중첨명방안。분석결과표명，신방안재계산성Diffie-hellman가설하만족강장성화불가위조성；재효솔상우우이유적동류첨명방안。근거가변적문한치，매개대리자도능비교호지생성상응적중첨명자밀약화험증공약。
Most of current threshold proxy re-signature schemes have only one threshold value.However in practical applications, the proxy number ( threshold value) of joint re-signature in threshold proxy re-signature scheme depends on the significance of the re-signing message.Based on the proxy re-signature scheme presented by Sherman et al, we propose a unidirectional variable threshold proxy re-signature scheme by making use of the Chinese remainder theorem, which is security provable in standard model.Analysis results show that the new scheme satisfies the robustness and unforgeability under computational Diffie-Hellman hypothesis.It outperforms existing similar signature schemes in efficiency.According to variable threshold value, each proxy can generate corresponding re-signature sub-key and verification key non-interactively.
