Security, A → Z
Security from the ground up.
One concept per post, attacked then defended — vulnerable code, the attack that breaks it, and the fix, with the reasoning written down. The ladder climbs with our grade ladder: Foundations → Applied → Deep → Proof. Read in order, or jump to your level.
L1
Foundations
The concept, and why it is dangerous.
L12026-06-27
What Tokens, Keys, and Signatures Actually Are
Tokens vs keys vs signatures, framed as access control — token vs key vs signature, what each one proves and what it cannot stop.
Access Control
L12026-06-26
Hash vs Encryption vs HMAC — Why HMAC Is Different
The hash vs encryption vs hmac difference, framed by access control and traceability — what each one guarantees, and what it cannot.
Access ControlAccountability