Full Domain Hash (FDH) Signature

A full domain hash (FDH) signature is an encryption method that follows the hash-and-sign approach within the realm of cryptographic signatures. By utilizing Rivest–Shamir–Adleman (RSA) public-key cryptography (PKC), FDH signatures offer a verifiable level of security based on the random oracle model. These signatures are extensively used in PKC and are considered a standardized set of signature mechanisms.