The Complete Course of SSL and TLS 2025

Explore cryptographic fundamentals and how SSL uses symmetric and asymmetric encryption to secure data. Understand hash functions, message authentication codes, and digital signatures, and how TLS handshake underpins secure communication.

Learn how hashing authenticates and ensures integrity in SSL/TLS by signing and verifying certificates, using MD5, SHA-1, and SHA-256 with practical lab demonstrations.

Explore how digital signatures and certificates validate public keys, how certificate authorities issue and sign certificates, and how browsers verify trust through certificate chains, including certificate transparency and common pitfalls.

Use SSL Labs tools to test SSL configurations and interpret scan results to analyze websites' certificates and signatures, while exploring GitHub resources for additional tools.

Explore SSL labs tools to test websites, inspect certificate chains, and analyze TLS protocol support, ciphersuites, and handshakes, with examples on facebook.com and x.com.

Explore the SSL protocol stack introduction, covering data encryption in HTTPS, symmetric and RSA approaches, hashing for integrity, TLS handshake overview, key exchange, and hands-on analysis with Wireshark and browsers.

Explain how HTTPS uses TLS data encryption with symmetric keys for speed, and compare RSA and Diffie-Hellman elliptic curve key exchange for secure transmission.

See how to analyze http traffic with Wireshark by filtering an ip address, inspecting an http login, and observing unencrypted credentials in a tcp handshake.

Use Wireshark to analyze https traffic and observe tls encrypted data, compare with http, see tls 1.2 in action, and verify that login details remain unreadable.

Explore how the TLS handshake and protocol establish secure client-server connections, including cipher suites, certificate validation, and symmetric key exchange.

Explore how TLS 1.2 is implemented on real websites by inspecting the TLS handshake, understanding the TLS record layer, and analyzing encapsulation with Wireshark.

Inspect a TLS connection to stackoverflow.com by capturing packets for multiple IP addresses, applying filters in Wireshark, and examining the TLS record layer within the TCP/IP model.

Learn how TLS handshake progresses, including the negotiation of ciphersuites, certificate validation, and key exchange, with practical Wireshark analysis and an introduction to Diffie-Hellman and elliptic-curve methods.

Explore the TLS handshake phases from client hello to finish, including certificate exchange, server hello done, key exchange via RSA or diffie-hellman, and cipher suites across TLS 1.2 and 1.3.

Diffie-Hellman key exchange uses a one-way modulus function to derive a shared symmetric key between Alice and Bob over an insecure channel using public and private keys.

Explore elliptic curve cryptography and how point addition and multiplication enable secure Diffie-Hellman key exchange. See how TLS 1.3 uses elliptic curve Diffie-Hellman to generate the same symmetric key.

An in-depth wireshark analysis of tls handshake highlights elliptic curve diffie-hellman, cipher suites, and certificate exchange, showing rsa-signed server parameters and encrypted application data.

Explore TLS key exchange differences between 1.2 and 1.3, use OpenSSL to list cipher suites, and identify the key exchange method and naming conventions.

Use OpenSSL to inspect ciphers and compare TLS 1.2 and 1.3 cipher suites. Understand why TLS 1.3 uses elliptic curve Diffie-Hellman and avoids RSA exposure, while SSL 3 is deprecated.

Explore SSL and TLS vulnerabilities and attacks, including downgrade attacks and common misconfigurations. Examine Heartbleed, Poodle, Logjam, BEAST, man-in-the-middle, and Google CA breaches.

The lecture explains downgrade attacks that force weaker encryption or cipher suites during TLS handshakes, often via a man-in-the-middle on public networks, with examples like poodle and logjam.

Explore the Heartbleed vulnerability in OpenSSL, showing how crafted heartbeat packets can expose server memory to remote attackers, a flaw discovered by Google in 2011, with vulnerable versions identified.

Explore major root CA failures in SSL history, from Diginotar and StartCom to Comodo and WoSign, and analyze how misissuance and trust breaches enable hacks.

Learn to install and run testssl.sh, a bash tool that scans TLS configurations for cryptographic flaws, on Linux or via Docker, with practical demonstrations.

Explore how testssl, a bash tool for scanning tls configurations and cryptographic flaws, is installed and run on Linux or via Docker for practical TLS testing.

Analyze SSL and TLS vulnerabilities with a docker-based test SSL tool, examining cipher suites, forward secrecy, and certificate details.

Explore deployment best practices for SSL and TLS by configuring Nginx, Apache, and Caddy, securing SMTP/IMAP/POP, hardening configurations, running syntax and protocol checks, and ensuring perfect forward secrecy.

Deploy and configure nginx using Docker Engine, set up self-signed SSL, and adjust nginx.conf with conf.d and default settings for secure HTTPS hosting.

Explore configuring the Apache web server for ssl, including enabling the ssl module, editing httpd.conf and httpd-ssl.conf, generating self-signed certificates, and testing locally on localhost.

Configure a postfix SMTP server with TLS using self-signed certificates in a dockerized ubuntu setup, building an image, copying the postfix config, and running postfix on port 25.

Perfect forward secrecy in TLS uses elliptic curve Diffie-Hellman to generate fresh keys for each session, ensuring a compromised private key cannot decrypt past traffic.

Acquire a domain from pork bun and a free Letsencrypt certificate to secure a GitHub pages site, then configure the certificate for a GitLab page connected to your domain.

Learn to buy a domain, use Porkbun's Let's Encrypt SSL with auto renew, and host on platforms like GitHub Pages and Vercel with a custom domain.

Identify common SSL and TLS issues across OpenSSL and browsers, and learn troubleshooting tools. Debug handshake failures by analyzing the process with Wireshark and inspecting certificates using Firefox network tools.

Troubleshoot ssl and tls certificate problems using real-world examples, verifying expired, wrong host, self-signed, untrusted, revoked, incomplete chain, no subject, and pinning issues with openssl and wireshark.

Explore common SSL and TLS issues, including weak Diffie-Hellman parameters, deprecated TLS versions, cipher suite mismatches, and certificate transparency with signed certificate timestamps.

Investigate common SSL and TLS issues, including Lenovo Superfish and other rootkits, invalid certificates, client certificates, mixed content, and deprecated SHA-1 and ciphers, with practical troubleshooting steps.

Explore TLS vulnerabilities using the testssl tool to scan for cryptographic flaws, install the bash script on Linux, or run via Docker on Windows or Mac.

Learn to troubleshoot TLS using a docker-based nmap setup and the ssl-ciphers script to enumerate cipher suites on an HTTPS server (port 443), including Diffie-Hellman with GCM/SHA-256.

Explore the fundamentals of certificate management, including PKI, certificate authorities, revocation and renewal, ACME protocol, and the roles of self-signed and CA-signed certificates in SSL for organizations.

Explore public key infrastructure and its role in securing modern networks through SSL, TLS, and PKI, including key pairs, certificates, and revocation processes.

Discover how to use public key infrastructure to sign Git commits with GPG, manage signing keys, and verify downloaded files with SHA-256 hashes for integrity.

Understand how certificate authorities issue and sign ssl/tls certificates, including domain validation, intermediaries, and automated issuance via shortcode and the ACME protocol with Let's Encrypt.

Explore certificate authorities and SSL options, from domain validation to extended validation, compare Globalsign, Digicert, Comodo CA, and Let's Encrypt, and learn verification methods, warranties, and OCSP basics.

Create and manage a certificate authority with OpenSSL, generate key pairs, sign certificates, and experiment with a root certificate authority to master SSL and TLS basics.

Learn to create a basic root CA with OpenSSL, generating a private key, a root certificate, and a signing request, then sign and inspect a local server certificate.

Explore advanced SSL/TLS concepts such as mutual authentication during the TLS handshake, two-way SSL configuration, and extended validation certificates, including certificate authorities and pricing.

Explore mutual authentication and two-way SSL, where client and server verify certificates during the TLS handshake. Learn to issue and verify client certificates and configure nginx for HTTP APIs.

Analyze extended validation certificates from root certificate authorities and compare their advantages over competitors and price differences.

Explore external validation by major certificate authorities, compare extended validation pricing, and understand how domain validation, organization validation, and multi-domain extended validation certificates secure websites.

Master SSL and TLS concepts from cryptographic principles to secure deployment, applying hands-on labs and practical assignments to protect network communications.