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SSL/TLS cheat sheet & developer notes

SSL/TLS cheat sheet and 3 curated developer notes — core concepts, patterns, and interview prep. Maintained by the DevRecall team.

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01 · SSL/TLS

How TLS Works: Handshake & Certificates

SSL/TLS: How TLS Works. TLS (Transport Layer Security) encrypts communication between client and server. SSL is the predecessor — it's deprecated. When people say "SSL" today they mean TLS. Current versions: TLS 1.2 (sti…

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02 · SSL/TLS

Certificate Authorities, PKI & Trust Chains

SSL/TLS: Certificates, CA & PKI. X.509 Certificate Structure. A certificate contains: Subject: CN=example.com, O=Example Inc, C=US Subject Alt Names (SAN): DNS:example.com, DNS:www.example.com, IP:93.184.216.34 Issuer: C…

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03 · SSL/TLS

Configuration: Nginx, HSTS, mTLS & Pinning

SSL/TLS: Configuration & Hardening. Nginx TLS Configuration. server { listen 443 ssl; listen [::]:443 ssl; http2 on; # enable HTTP/2 server_name example.com www.example.com; # Certificate chain (leaf + intermediates) ssl…

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Concepts to know for SSL/TLS

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The TLS Handshake and Certificate ChainsWhat happens in the round trip before HTTPS sends a byte: key exchange, certificate checks, forward secrecy, 0-RTT, and why handshakes fail in production.Intermediate·14 min

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