Identity based signatures (IBS) are a type of digital signature scheme where a user’s public key can be any arbitrary string representing their identity, such as an email address or name. This eliminates the need for a public key infrastructure (PKI) to distribute and verify public keys. A trusted private key generator creates the corresponding private key for a given identity. IBS simplifies key management and reduces overhead in certain cryptographic systems.
Context
Identity based signatures offer a streamlined approach to key management, which is particularly relevant for simplifying user experiences in digital asset applications. Debates often concern the inherent trust placed in the private key generator and potential issues related to key escrow. Future developments include advancements in threshold identity based signature schemes and combining IBS with decentralized identity solutions to mitigate single points of trust.
Expander Signature decouples heavy key generation from verification, enabling resource-limited devices to achieve constant-size, efficient, and forward-secure authentication.
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