论文标题
通过转移椭圆曲线Diffie-Hellman密钥交换的OpenPGP电子邮件转发
OpenPGP Email Forwarding Via Diverted Elliptic Curve Diffie-Hellman Key Exchanges
论文作者
论文摘要
离线OpenPGP用户可能希望将部分或所有电子邮件转发给第三方。鉴于消息是加密的，这需要将它们转换为预期转发方可以解密的密文，同时保持机密性和身份验证。在最近的工作中显示，这可以通过代理重新加密方案来实现，但是，虽然加密的电子邮件转发是代理重新加密的最多提及的应用，但尚未在OpenPGP上下文中实施，据我们所知。在本文中，我们调整了Eurocrypt'98中Blaze，Bleumer和Strauss引入的开创性技术，允许邮件传输代理转换和转发OpenPGP消息，而无需访问解密键或明文。我们还提供实施细节和安全分析。
An offline OpenPGP user might want to forward part or all of their email messages to third parties. Given that messages are encrypted, this requires transforming them into ciphertexts decryptable by the intended forwarded parties, while maintaining confidentiality and authentication. It is shown in recent lines of work that this can be achieved by means of proxy-re-encryption schemes, however, while encrypted email forwarding is the most mentioned application of proxy-re-encryption, it has not been implemented in the OpenPGP context, to the best of our knowledge. In this paper, we adapt the seminal technique introduced by Blaze, Bleumer and Strauss in EUROCRYPT'98, allowing a Mail Transfer Agent to transform and forward OpenPGP messages without access to decryption keys or plaintexts. We also provide implementation details and a security analysis.
