Adding a digital signature ensures that a corresponding public key can validate the file. If the signature does not match, it indicates tampering or an unverified source. Other methods such as using a passphrase, a firewall, or encrypting the binaries do not confirm publisher authenticity or enable precise integrity checks.
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How does a digital signature confirm integrity and authenticity?
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What is the difference between a public key and a private key in digital signatures?
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Why are other methods like encryption or passphrases insufficient for verifying authenticity?