Beginner LevelWeb Security & Cyber Defense
How does HTTPS (TLS/SSL) secure data in transit between browsers and web servers?
❓ Interview Prompt: Explain TLS 1.3 Handshake, X.509 Digital Certificates, Public Key Cryptography, Symmetric AES session keys, and Confidentiality / Integrity.
HTTPS (HTTP Secure) layers HTTP traffic over an encrypted TLS (Transport Layer Security) channel:
3 Security Guarantees:
1
Confidentiality: Encrypts data payload in transit, preventing eavesdropping.
2
Integrity: MAC (Message Authentication Code) hashes detect payload tampering.
3
Authentication: Server proves identity using an X.509 Certificate issued by a trusted Certificate Authority (CA).
TLS 1.3 Handshake Steps:
1
Key Exchange: Client and Server exchange public keys via Diffie-Hellman to derive a shared Symmetric AES Session Key.
2
Symmetric Payload Encryption: Fast symmetric encryption is used for all subsequent HTTP traffic.
Code Implementation Example
bash
# Inspect TLS Certificate and Handshake details via OpenSSL CLI:
openssl s_client -connect api.example.com:443 -tls1_3💡Inspecting server TLS 1.3 certificates and handshake negotation with OpenSSL.
🎯 Interview Key Takeaway
HTTPS combines asymmetric key exchange with fast symmetric AES payload encryption to guarantee confidentiality and integrity.
#HTTPS#TLS#Encryption#Certificates#Beginner
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