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首页> 外文期刊>Designs, Codes and Crytography >Verifiably encrypted signatures with short keys based on the decisional linear problem and obfuscation for encrypted VES
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Verifiably encrypted signatures with short keys based on the decisional linear problem and obfuscation for encrypted VES

机译：基于决策线性问题和加密VES的混淆，使用短键可验证地加密签名

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摘要

Verifiably encrypted signatures (VES) are encrypted signatures under a public key of a trusted third party. We can verify their validity without decryption. VES has useful applications such as online contract signing and optimistic fair exchange. We propose a VES scheme that is secure under the decisional linear (DLIN) assumption in the standard model. We also propose new obfuscators for encrypted signatures (ES) and encrypted VES (EVES) that are secure under the DLIN assumption. All previous VES schemes in the standard model are either secure under standard assumptions (such as the computational Diffie-Hellman assumption) with large verification (or secret) keys or secure under non-standard dynamic -type assumptions (such as the -strong Diffie-Hellman extraction assumption) with short verification keys. Our scheme is the first VES scheme with short verification (and secret) keys secure under the DLIN assumption (standard assumption). We construct new obfuscators for ES/EVES as byproducts of our new VES scheme. They are more efficient than previous obfuscators with respect to public key size. Previous obfuscators for EVES are secure under non-standard assumption and use zero-knowledge (ZK) proof systems and Fiat-Shamir heuristics to obtain non-interactive ZK, i.e., its security is considered in the random oracle model. Thus, our scheme also has an advantage with respect to assumptions and the security model. Our new obfuscator for ES is obtained from our new obfuscator for EVES.
机译：可验证加密签名（VES）是受信任第三方的公共密钥下的加密签名。我们无需解密即可验证其有效性。 VES具有有用的应用程序，例如在线合同签署和乐观的公平交易。我们提出了在标准模型中的决策线性（DLIN）假设下是安全的VES方案。我们还为在DLIN假设下安全的加密签名（ES）和加密VES（EVES）提出了新的混淆器。标准模型中所有以前的VES方案都是在具有大验证（或秘密）密钥的标准假设（例如计算Diffie-Hellman假设）下是安全的，或者在非标准动态类型假设（例如-strong Diffie-验证码较短的Hellman提取假设）。我们的方案是第一个在DLIN假设（标准假设）下具有短验证（和秘密）密钥安全的VES方案。我们为ES / EVES构造了新的混淆器，作为新VES方案的副产品。在公钥大小方面，它们比以前的混淆器更有效。以前的EVES混淆器在非标准假设下是安全的，并使用零知识（ZK）证明系统和Fiat-Shamir启发式算法来获得非交互式ZK，即在随机预言模型中考虑了其安全性。因此，我们的方案在假设和安全模型方面也具有优势。我们新的ES混淆器是从我们新的EVES混淆器获得的。

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