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From the theoretical perspective, we provide the formal definition and security notion of a key-insulated undetachable digital signature. From the practical perspective, we propose a concrete scheme to secure mobile agents in electronic commerce. The scheme is mainly focused on protecting the signing key from leakage and preventing the misuse of the signature algorithm on malicious servers. Agents do not carry the signing key when they generate digital signatures on behalf of the original signer, so the key is protected on remote servers. Furthermore, if a hacker gains the signing key of the original signer, the hacker is still unable to forge a signature for any time period other than the key being accessed. In addition, the encrypted function is combined with the original signer\u2019s requirement to prevent the misuse of signing algorithm. The scheme is constructed on gap Diffie\u2013Hellman groups with provable security, and the performance testing indicates that the scheme is efficient.<\/jats:p>","DOI":"10.1155\/2016\/4375072","type":"journal-article","created":{"date-parts":[[2016,6,20]],"date-time":"2016-06-20T21:03:32Z","timestamp":1466456612000},"page":"1-18","source":"Crossref","is-referenced-by-count":5,"title":["Key-Insulated Undetachable Digital Signature Scheme and Solution for Secure Mobile Agents in Electronic Commerce"],"prefix":"10.1155","volume":"2016","author":[{"given":"Yang","family":"Shi","sequence":"first","affiliation":[{"name":"School of Software Engineering, Tongji University, 4800 Cao\u2019an Highway, Shanghai 201804, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jie","family":"Lin","sequence":"additional","affiliation":[{"name":"School of Economics and Management, Tongji University, 4800 Cao\u2019an Highway, Shanghai 201804, 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