In proxy signature schemes,the proxy signer B is permitted to produce a signature on behalf of the original signer A. However,exposure of proxy signing keys can be the most devastating attack on a proxy signature sche...In proxy signature schemes,the proxy signer B is permitted to produce a signature on behalf of the original signer A. However,exposure of proxy signing keys can be the most devastating attack on a proxy signature scheme since any adversary can sign messages on behalf of the proxy signer. In this paper,we applied Dodis,et al.’s key-insulation mechanism and proposed an Identity-Based (ID-based) Key-Insulated Proxy Signature (IBKIPS) scheme with secure key-updates. The proposed scheme is strong key-insulated and perfectly key-insulated. Our scheme also supports unbounded period numbers and random-access key-updates.展开更多
A Verifiably Encrypted Signature (VES) plays an essential role in the construction of a fair data exchange. The paper proposes an Identity-based Proxy Verifiably Encrypted Signature (IPVES) to combine the advantages o...A Verifiably Encrypted Signature (VES) plays an essential role in the construction of a fair data exchange. The paper proposes an Identity-based Proxy Verifiably Encrypted Signature (IPVES) to combine the advantages of a proxy signature and a VES in order to delegate the signing capability of the VES of an entity called the original signer to another entity, called the proxy signer. In this IPVES scheme, the original signer delegates his/her signing capability to the proxy signer. The proxy signer issues a signature by using a proxy signing key, encrypts the signature under a designated public key, and subsequently convinces a verifier that the resulting ciphertext contains such a signature. We prove that the proposed IPVES scheme is secure in a random oracle model under the computational Diffie-Hellman assumption.展开更多
Unconditionally secure signature is an important part of quantum cryptography. Usually, a signature scheme only provides an environment for a single signer. Nevertheless, in real applications, many signers may collabo...Unconditionally secure signature is an important part of quantum cryptography. Usually, a signature scheme only provides an environment for a single signer. Nevertheless, in real applications, many signers may collaboratively send a message to the verifier and convince the verifier that the message is actually transmitted by them. In this paper, we give a scalable arbitrated signature protocol of classical proved to be secure even with a compromised arbitrator. messages with multi-signers. Its security is analyzed and proved to be secure even with a compromised arbitrator.展开更多
1921年5月3日至6日,第8届英国集邮大会在哈罗盖特（Harrogate）举行。根据上届大会的决定,由11个国家25名集邮家组成的专门委员会,向大会提交一份关于设立集邮奖项的研究报告和管理办法,经审议后确定创设＂杰出集邮家名册＂（Roll of Di...1921年5月3日至6日,第8届英国集邮大会在哈罗盖特（Harrogate）举行。根据上届大会的决定,由11个国家25名集邮家组成的专门委员会,向大会提交一份关于设立集邮奖项的研究报告和管理办法,经审议后确定创设＂杰出集邮家名册＂（Roll of Distinguished Philatelists,缩写RDP）,每年邀请入选者在名册上签署姓名并颁发奖牌以示奖励表彰。名册第一个签名者就是人称＂集邮国王＂的乔治五世（图1）。展开更多
基金Supported by the National Natural Science Foundation of China (No. 60573032, 60773092, 90604036, 60873229, 60903178, 60672072, 60832003)Zhejiang Provincial Natural Science Foundation of China (No. Y106505)
文摘In proxy signature schemes,the proxy signer B is permitted to produce a signature on behalf of the original signer A. However,exposure of proxy signing keys can be the most devastating attack on a proxy signature scheme since any adversary can sign messages on behalf of the proxy signer. In this paper,we applied Dodis,et al.’s key-insulation mechanism and proposed an Identity-Based (ID-based) Key-Insulated Proxy Signature (IBKIPS) scheme with secure key-updates. The proposed scheme is strong key-insulated and perfectly key-insulated. Our scheme also supports unbounded period numbers and random-access key-updates.
基金supported partially by the Projects of National Natural Science Foundation of China under Grants No.61272501 the National Key Basic Research Program （NK-BRP）（973 program）under Grant No.2012CB315900 the Specialized Research Fund for the Doctoral Program of Higher Education under Grant No.20091102110004
文摘A Verifiably Encrypted Signature (VES) plays an essential role in the construction of a fair data exchange. The paper proposes an Identity-based Proxy Verifiably Encrypted Signature (IPVES) to combine the advantages of a proxy signature and a VES in order to delegate the signing capability of the VES of an entity called the original signer to another entity, called the proxy signer. In this IPVES scheme, the original signer delegates his/her signing capability to the proxy signer. The proxy signer issues a signature by using a proxy signing key, encrypts the signature under a designated public key, and subsequently convinces a verifier that the resulting ciphertext contains such a signature. We prove that the proposed IPVES scheme is secure in a random oracle model under the computational Diffie-Hellman assumption.
基金Supported by the National High-Tech Research,Development Plan of China under Grant Nos.2006AA01Z440,2009AA012441,2009AA012437National Basic Research Program of China (973 Program 2007CB311100)+4 种基金the National Natural Science Foundation of China under Grant Nos.60873191 and 60821001Specialized Research Fund for the Doctoral Program of Higher Education under Grant Nos.20091103120014,20090005110010Beijing Natural Science Foundation under Grant Nos.1093015,1102004the Scientific Research Common Program of Beijing Municipal Commission of Education under Grant No.KM200810005004the ISN Open Foundation
文摘Unconditionally secure signature is an important part of quantum cryptography. Usually, a signature scheme only provides an environment for a single signer. Nevertheless, in real applications, many signers may collaboratively send a message to the verifier and convince the verifier that the message is actually transmitted by them. In this paper, we give a scalable arbitrated signature protocol of classical proved to be secure even with a compromised arbitrator. messages with multi-signers. Its security is analyzed and proved to be secure even with a compromised arbitrator.
文摘1921年5月3日至6日,第8届英国集邮大会在哈罗盖特（Harrogate）举行。根据上届大会的决定,由11个国家25名集邮家组成的专门委员会,向大会提交一份关于设立集邮奖项的研究报告和管理办法,经审议后确定创设＂杰出集邮家名册＂（Roll of Distinguished Philatelists,缩写RDP）,每年邀请入选者在名册上签署姓名并颁发奖牌以示奖励表彰。名册第一个签名者就是人称＂集邮国王＂的乔治五世（图1）。
