计算机科学
可验证秘密共享
计算机安全
方案(数学)
数字签名
秘密分享
签名(拓扑)
加密
钥匙(锁)
理论计算机科学
程序设计语言
散列函数
几何学
数学
数学分析
集合(抽象数据类型)
标识
DOI:10.1007/s11042-018-6725-7
摘要
Ren and Jiang recently published a “verifiable outsourced attribute-based signature scheme” in Multimedia Tools and Applications. In this note, we first provide two attacks on the verifiability of the semi-signatures of this scheme by showing that a malicious signing-cloud service provider (S-CSP) can always cheat the signer unlike the authors’ claim. Moreover, one of these attacks also implies that an untrusted S-CSP can always forge signatures contrary to the claimed unforgeability against chosen message attacks. Therefore, this scheme unfortunately does not satisfy the main security properties for a delegated signature scheme.
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