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ISACA Certified Information Systems Auditor · Isaca
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To create a digital signature, you would take the message or file you would like to sign and run it through a hash function. After that, you take the resulting message digest or hash, combine it with your private key, and then run them through a signing algorithm like RSA or DSA.
For Asymmetric Encryption, the sender uses a public key to encrypt the data and the receiver uses the private key to decrypt the encrypted data. For Signing, the sender uses the private key to create the message's signature and the receiver uses the public key to verify the signature.