The Joint Signature and Encryption Revisited release_w5oes4j5qzgydmolhlwm5r42m4

by Laila El Aimani

Released as a article .

2016  

Abstract

We study the Sign_then_Encrypt, Commit_then_Encrypt_and_Sign, and Encrypt_then_Sign paradigms in the context of two cryptographic primitives, namely designated confirmer signatures and signcryption. Our study identifies weaknesses in those paradigms which impose the use of expensive encryption (as a building block) in order to meet a reasonable security level. Next, we propose some optimizations which annihilate the found weaknesses and allow consequently cheap encryption without compromising the overall security. Our optimizations further enjoy verifiability, a property profoundly needed in many real-life applications of the studied primitives.
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Type  article
Stage   submitted
Date   2016-10-29
Version   v1
Language   en ?
arXiv  1610.09503v1
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