Abstract
Abstract: This paper introduces an innovative digital signature method called the "expander signature" and explores its Blockchain technology applications. The key advantage of this approach is that a signer can create and manage multiple signatures using a powerful computer, storing expander keys securely. When needed, the signer can release specific expander keys for signature verification, even on resource-limited devices. The paper formally defines the syntax and the security of expander signatures, providing generic constructions from different signature schemes. Importantly, security of expander signatures relies on underlying public key signature schemes, ensuring the signer's secret key remains confidential. This innovation is showcased through an application in blockchain technology.
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