Compare RSA and elliptic curve keypairs by security strength, performance, and encoding. Learn PKCS#8 and SPKI PEM structure, why SSH needs a different format, and where post-quantum migration stands.
Understand how JavaScript’s backtracking regex engine works, what makes a pattern degrade to exponential time, and the concrete rewrites that make catastrophic backtracking impossible.
Understand how authenticator apps generate 6-digit 2FA codes. Learn the RFC 6238 time-step formula, HOTP dynamic truncation, Base32 secret encoding, otpauth:// URI parameters, and clock drift windows.
Learn how EXIF, XMP, and IPTC metadata are stored inside JPEG and PNG files, exactly which fields expose your location and devices, which platforms strip them and which do not, and how to remove them without recompressing the image.
Deep dive into AES-GCM and AES-CBC symmetric cryptography. Learn Galois/Counter Mode authenticated encryption, 96-bit IV generation, and client-side Web Crypto security.
Step-by-step tutorial on formatting, validating, and debugging JSON payloads locally in your browser. Complete guide to syntax errors, RFC 8259 rules, and zero-server security.