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How does it work?
As shown in Figure 2.11, the digital signature process consists of two parts: signing, and verification. Unlike with encryption, the digital signature performs the first operation, signing using the private key. Verification uses the public key distributed by the signer.
A hashing algorithm generates a unique fixed length value that is used during the construction and verification of a digital signature. Refer to the next section for a detailed explanation of cryptographic hashing.