Signcryption with quantum random oracles. (English) Zbl 1443.94078

Sato, Shingo; Shikata, Junji

Baek, Joonsang (ed.) et al., Provable security. 12th international conference, ProvSec 2018, Jeju, South Korea, October 25–28, 2018. Proceedings. Cham: Springer. Lect. Notes Comput. Sci. 11192, 406-414 (2018).

Summary: Signcryption is a cryptographic scheme that achieves the functionalities of both public-key encryption and digital signatures. It is an important scheme for realizing a mechanism of sending and/or receiving messages in a secure way, since it is understood that signcryption is a public-key based protocol to realize a secure channel from an insecure channel. On the other hand, various post-quantum cryptographic schemes have been proposed so far. Recently, several cryptographic schemes have been proposed in the quantum random oracle model where an adversary can submit quantum queries to a random oracle. In this paper, we propose a generic construction of signcryption in the quantum random oracle model for the first time. Our construction achieves both of the strongest confidentiality and strongest integrity in the multi-user setting tightly.
For the entire collection see [Zbl 1398.94007].

MSC:

94A60	Cryptography
94A62	Authentication, digital signatures and secret sharing

Keywords:

signcryption; post-quantum cryptography; quantum random oracle