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On the Joint Security of Encryption and Signature, Revisited

Kenneth G. Paterson, Jacob C. N. Schuldt, Martijn Stam, Susan Thomson, On the Joint Security of Encryption and Signature, Revisited. Advances in Cryptology - ASIACRYPT 2011. ISBN 978-3-642-25384-3, pp. 161–178. December 2011. No electronic version available. External information


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.

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