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Digital Signatures, Certificates, PKI and TLS
Digital Signatures, Certificates, PKI and TLS A digital signature proves who sent a message and that it was not changed. Certificates and PKI prove a public key really belongs to someone. Hash the message, then encrypt the hash with your private key. Anyone checks it with your public key. If the mes
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What this card says
What it is
A digital signature proves who sent a message and that it was not changed.
Certificates and PKI prove a public key really belongs to someone.
How a signature works
Hash the message, then encrypt the hash with your private key.
Anyone checks it with your public key. If the message changes, the hash won’t match.
Why it matters for security
This gives integrity, authentication and non-repudiation.
A Certificate Authority signs certificates, which is how HTTPS (TLS) trusts a website.
Learn more in the lesson: 33.5 Digital Signatures, Certificates, PKI and TLS