Abstract
Mediated RSA (mRSA) [1] is a simple and practical method of splitting RSA private keys between the user and the Security Mediator (SEM). Neither the user nor the SEM can cheat each other since a signature or a decryption must involve both parties. mRSA allows fast and fine-grained control (revocation) of users’ security priviliges. Forward security is an important and desirable feature for signature schemes. Despite some notable recent results, no forward-secure RSA variant has been developed. In this paper (abstract), we show how weak forward security can be efficiently obtained with mediated RSA. We consider several methods, based on both multiplicative and additive mRSA and discuss their respective merits.KeywordsSignature SchemeSignature RequestForward SecurityExtra ExponentiationSuitable Hash FunctionThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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