Cryptography on Hanh Pham's Bloghttps://hanh.me/tags/cryptography/Recent content in Cryptography on Hanh Pham's BlogHugoen-usThu, 29 Oct 2026 12:50:49 +0700Flare-On 13 Part 2: A Patched SHA-256d, a Vanity Volume Serial, and a Hand-Rolled Huffman Decoderhttps://hanh.me/posts/flare-on-13-part-2-cryptanalysis-and-compression/Mon, 26 Oct 2026 09:00:00 +0700https://hanh.me/posts/flare-on-13-part-2-cryptanalysis-and-compression/A 32-round SHA-256 whose Ch and Maj functions were rewritten, keyed off a 32-bit volume serial that spells ICE COLD in leetspeak, and a 264-byte RC4 keystream reused as a two-time pad before five JPEGs come back out of a custom canonical Huffman bitstream.