TLS versions explained: from SSL 3.0 to TLS 1.3Every TLS version from SSL 3.0 to TLS 1.3 explained — what changed, what broke, and why old versions are now disabled by default.SSH explained: how Secure Shell worksSSH explained: what Secure Shell is, how the protocol works end to end, and why it replaced telnet and rsh.What is HSTS (HTTP Strict Transport Security)? How it works and why it mattersHTTP Strict Transport Security (HSTS) is a web security policy that forces browsers to only use HTTPS. Learn how the Strict-Transport-Security header works, what it protects against, and how HSTS preload lists eliminate the SSL-stripping window.How to use the Web Crypto API in the browser: hashing, signing, and encryptionThe Web Crypto API gives every browser a built-in cryptography engine. Learn how to hash data, sign and verify messages, and encrypt or decrypt content using SubtleCrypto — with practical code examples and security notes. 