Tag
hmac
- Jul 2, 2026 Length Extension and Prefix-Free Message Encoding Why an iterated hash can be continued from its own digest, how the attack reconstructs unknown input from output alone, and which encodings close the hole. cryptography
- Apr 10, 2026 Why HMAC Hashes Twice and What Length Extension Has to Do With It The nested construction that turns a plain hash into a keyed MAC, the Merkle-Damgard weakness it neutralises, and why the two fixed inner and outer pads are load-bearing. cryptography
- Oct 22, 2025 Page-Level Encryption: Nonces, MACs, and the Cost of Decrypting Every Read How an embedded database encrypts individual pages with a per-page nonce and a per-page MAC, what that costs in usable page space, and why the key cache is the real attack surface. mobile computing