Restrictive partially blind signature （RPBS） plays an important role in designing secure electronic cash system Very recently, Wang, Tang and Li proposed a neW ID-based restrictive partially blind signature （ID-RPB...Restrictive partially blind signature （RPBS） plays an important role in designing secure electronic cash system Very recently, Wang, Tang and Li proposed a neW ID-based restrictive partially blind signature （ID-RPBS） and gave the security proof. In this paper, we present a cryptanalysis of the scheme and show that the signature scheme does not satisfy the property of unforgeability as claimed. More precisely, a user can forge a valid message-signature pair （ID, msg, info＇, σ＇） instead of the original one （ID, msg, info, σ）, where info is the original common agreed information and info＇≠info. Therefore, it will be much dangerous if Wang-Tang-Li＇s ID-RPBS scheme is applied to the off-line electronic cash system. For example, a bank is supposed to issue an electronic coin （or bill） of $100 to a user, while the user can change the denomination of the coin （bill） to any value, say $100 000 000, at his will.展开更多
ID-based public key cryptography （ID-PKC） has many advantages over certificate-based public key cryptography （CA-PKC）, and has drawn researchers＇ extensive attention in recent years. However, the existing electro...ID-based public key cryptography （ID-PKC） has many advantages over certificate-based public key cryptography （CA-PKC）, and has drawn researchers＇ extensive attention in recent years. However, the existing electronic cash schemes are constructed under CA-PKC, and there seems no electronic cash scheme under ID-PKC up to now to the best of our knowledge. It is important to study how to construct electronic cash schemes based on ID-PKC from views on both practical perspective and pure research issue. In this paper, we present a simpler and provably secure ID-based restrictive partially blind signature （RPBS）, and then propose an ID-based fair off-line electronic cash （ID-FOLC） scheme with multiple banks based on the proposed ID-based RPBS. The proposed ID-FOLC scheme with multiple banks is more efficient than existing electronic cash schemes with multiple banks based on group blind signature.展开更多
基金This work is supported by the National Natural Science Foundation of China under Grant Nos.60673077, 60503006, 60773202,and 60633030the National Natural Science Foundation of China-Korea Science and Engineering Foundation Joint Research Project(Grant No.60611140543)the National Grand Fundamental Research 973 Program of China(Grant No.2006CB303104).
文摘Restrictive partially blind signature （RPBS） plays an important role in designing secure electronic cash system Very recently, Wang, Tang and Li proposed a neW ID-based restrictive partially blind signature （ID-RPBS） and gave the security proof. In this paper, we present a cryptanalysis of the scheme and show that the signature scheme does not satisfy the property of unforgeability as claimed. More precisely, a user can forge a valid message-signature pair （ID, msg, info＇, σ＇） instead of the original one （ID, msg, info, σ）, where info is the original common agreed information and info＇≠info. Therefore, it will be much dangerous if Wang-Tang-Li＇s ID-RPBS scheme is applied to the off-line electronic cash system. For example, a bank is supposed to issue an electronic coin （or bill） of $100 to a user, while the user can change the denomination of the coin （bill） to any value, say $100 000 000, at his will.
基金This work is supported by the National Natural Science Foundation of China under Grant Nos.60503005 and 60673135the Natural Science Foundation of Guangdong Province under Grant No.05200302the Open Fund of Guangdong Province Information Security Key Laboratory and the State Key Laboratory of Information Security.
文摘ID-based public key cryptography （ID-PKC） has many advantages over certificate-based public key cryptography （CA-PKC）, and has drawn researchers＇ extensive attention in recent years. However, the existing electronic cash schemes are constructed under CA-PKC, and there seems no electronic cash scheme under ID-PKC up to now to the best of our knowledge. It is important to study how to construct electronic cash schemes based on ID-PKC from views on both practical perspective and pure research issue. In this paper, we present a simpler and provably secure ID-based restrictive partially blind signature （RPBS）, and then propose an ID-based fair off-line electronic cash （ID-FOLC） scheme with multiple banks based on the proposed ID-based RPBS. The proposed ID-FOLC scheme with multiple banks is more efficient than existing electronic cash schemes with multiple banks based on group blind signature.
