Signcryption
In cryptography , Signcryption refers to an asymmetrical cryptosystem that can ensure the authenticity and confidentiality of a message at the same time . For certain areas of application (especially with large key lengths), signcryption implementations require significantly less computing effort and communication volume than conventional methods, which first sign the message and then encrypt it symmetrically ( sign-then- encryption ) to ensure authenticity and confidentiality . The efficiency advantages of sign encryption (a) require that all parties involved share the common key parameters and (b) require the interaction of the signature recipient ( Bob ) and the decisive third party ( judge ) in a dispute about the validity of a signature ( Interactive Repudiation Settlement ).
Signcryption was first published in 1997 and is patented in Australia and the United States (Australia: Patent No. 721497, USA: Patent No. 6,396,928).
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- ^ Yuliang Zheng: Digital Signcryption or How to Achieve Cost (Signature & Encryption) << Cost (Signature) + Cost (Encryption) . In Advances in Cryptology - Crypto'97, Lecture Notes in Computer Science, Vol. 1294, pp. 165-179, Springer-Verlag, 1997.