The Joint Signature and Encryption Revisited
Cryptography and Security
2016-11-01 v1
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.
Cite
@article{arxiv.1610.09503,
title = {The Joint Signature and Encryption Revisited},
author = {Laila El Aimani},
journal= {arXiv preprint arXiv:1610.09503},
year = {2016}
}
Comments
70 pages