Paper 2021/161

Generic Adaptor Signature

Xianrui Qin, Handong Cui, and Tsz Hon Yuen

Abstract

Adaptor signature is becoming an increasingly important tool in solving the scalability and interoperability issues of blockchain applications. It has many useful properties, such as reducing the on-chain communication cost, increasing the fungibility of transactions, and circumventing the limitation of the blockchain's scripting language. In this paper, we propose the first generic construction of adaptor signatures from {\sf Type-T} canonical identification, which includes discrete-logarithm-based, RSA-based, and lattice-based constructions. Our generic construction can be used as a general framework to combine with different privacy-preserving cryptosystems. We propose blind adaptor signature and linkable ring adaptor signature, which are useful in different blockchain applications.