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International Association for Cryptologic Research (IACR)
Abstract
We revisit the topic of joint security for combined public key schemes, wherein a single keypair is used for both encryption and signature primitives in a secure manner. While breaking the principle of key separation, such schemes have attractive properties and are sometimes used in practice. We give a general construction for a combined public key scheme having joint security that uses IBE as a component and that works in the standard model. We provide a more efficient direct construction, also in the standard model. We then consider the problem of how to build signcryption schemes from jointly secure combined public key schemes. We provide a construction that uses any such scheme to produce a triple of schemes -- signature, encryption, and signcryption -- that are jointly secure in an appropriate and strong security model
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