Tag: encryption
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Most referenced — #encryption
HTTPS & TLS 2PHP Sodium Extension (Libsodium) 2Block Cipher Modes 2TLS Handshake 2Symmetric Encryption 2mcrypt Deprecation — Migrate to OpenSSL 1
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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.
3mo 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).
3mo ago
PHP intermediate
PHP Sodium Extension (Libsodium)
PHP 7.2+
5
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.
3mo 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.
3mo ago
Cryptography advanced
Column-Level Encryption
PHP 7.1+
1
Encrypting sensitive database columns (SSN, credit card, medical data) — application holds the key; database never sees plaintext; breach exposes only ciphertext.
3mo ago
Database advanced
Symmetric Encryption
PHP 7.2+
1
Encryption where the same key encrypts and decrypts data — fast and suitable for bulk data, but key distribution is the primary challenge.
3mo ago
Cryptography advanced
TLS Handshake
2
The negotiation process between client and server that establishes an encrypted HTTPS connection, agreeing on cipher suites and exchanging keys.
3mo ago
Networking intermediate