Digital Signatures: Authentication & Integrity 🔐

Digital signatures are the trust foundation of PKI — they're how certificates prove identity, code proves it hasn't been tampered with, and emails prove who sent them. This video breaks down exactly how digital signatures work, step by step.

🔑 Key Points:
- Digital signatures use asymmetric cryptography: sign with private key, verify with public key
- Three guarantees: authentication, integrity, and non-repudiation
- Hash-then-sign: the signature covers a hash of the data, not the data itself
- Real-world uses: TLS certificates, code signing, S/MIME, document signing
- Digital signatures ≠ electronic signatures — the cryptographic difference matters

📚 Full written guide:
https://fixmycert.com/guides/digital-signatures
🧪 Interactive demo:
https://fixmycert.com/demos/digital-signatures
📚 Want to go deeper on TLS? Take the Practical TLS course:
https://classes.pracnet.net/courses/practical-tls?affiliate=6azpRz

🎬 Related Videos:
- ACME Protocol Explained - How TLS Automation Actually Works: https://www.youtube.com/watch?v=iHWfD8p12I0
- How TLS Works - Handshake, Key Exchange & Encryption Explained: https://www.youtube.com/watch?v=QHGFifNh3BQ
- Certificate Anatomy - Every X.509 Field Explained: https://www.youtube.com/watch?v=5BNGZSy-4fc
- S/MIME Email Security: https://www.youtube.com/watch?v=9s3QfTCi7ow
- Encrypted Client Hello (ECH) Explained — The TLS Privacy Gap Finally Closed: https://www.youtube.com/watch?v=Sv0j25zhqJk
- RSA Encryption Explained — The Math Inside Every Certificate: https://www.youtube.com/watch?v=e1CdqNW7MWM
- Code Signing Explained — Timestamps, EV Certificates & What Breaks Without It: https://www.youtube.com/watch?v=zfWvZrPT8v0

🔗 More PKI education:
https://fixmycert.com

#SSL #TLS #Certificates #PKI #CyberSecurity #DigitalSignatures #Cryptography #NonRepudiation #CodeSigning #DevOps #SRE