On the Security of Joint Signature and Encryption

  title={On the Security of Joint Signature and Encryption},
  author={Jee Hea An and Yevgeniy Dodis and Tal Rabin},
  journal={IACR Cryptology ePrint Archive},
We formally study the notion of a joint signature and encryption in the public-key setting. We refer to this primitive as signcryption, adapting the terminology of [35]. We present two de£nitions for the security of signcryption depending on whether the adversary is an outsider or a legal user of the system. We then examine generic sequential composition methods of building signcryption from a signature and encryption scheme. Contrary to what recent results in the symmetric setting [5, 22… CONTINUE READING
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