Tag: encryption
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HTTPS & TLS
HTTP over TLS — encrypts all traffic between browser and server, preventing eavesdropping, man-in-the-middle attacks, and tampering. Required for cookies, modern APIs, and all production web applications.
2mo ago
security beginner
mcrypt Deprecation — Migrate to OpenSSL PHP 5.0+
mcrypt was deprecated in PHP 7.1 and removed in PHP 7.2 — migrate all encryption to OpenSSL (openssl_encrypt) or libsodium (sodium_crypto_secretbox).
2mo ago
php intermediate
PHP Sodium Extension (Libsodium) PHP 7.2+
The Sodium extension (bundled since PHP 7.2) provides modern, misuse-resistant cryptography via the libsodium C library — covering authenticated encryption, key exchange, password hashing with Argon2, and digital signatures with a simple, safe API.
2mo ago
php advanced
Block Cipher Modes PHP 7.1+
How a block cipher (AES) processes data larger than one block — ECB is insecure, CBC requires a MAC, GCM provides authenticated encryption and is the correct choice.
2mo ago
cryptography advanced
Column-Level Encryption PHP 7.1+
Encrypting sensitive database columns (SSN, credit card, medical data) — application holds the key; database never sees plaintext; breach exposes only ciphertext.
2mo ago
database advanced
Symmetric Encryption PHP 7.2+
Encryption where the same key encrypts and decrypts data — fast and suitable for bulk data, but key distribution is the primary challenge.
2mo ago
cryptography advanced
TLS Handshake The negotiation process between client and server that establishes an encrypted HTTPS connection, agreeing on cipher suites and exchanging keys.
2mo ago
networking intermediate