On the Joint Security of Encryption and Signature, Revisited
- Cite this paper as:
- Paterson K.G., Schuldt J.C.N., Stam M., Thomson S. (2011) On the Joint Security of Encryption and Signature, Revisited. In: Lee D.H., Wang X. (eds) Advances in Cryptology – ASIACRYPT 2011. ASIACRYPT 2011. Lecture Notes in Computer Science, vol 7073. Springer, Berlin, Heidelberg
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.