https://th3b0ywh0l1v3d.github.io/tags/stream-cipher/ Recent content in Stream-Cipher on Th3B0yWh0L1v3d — Security Writeups Hugo en-us Sat, 06 Jun 2026 00:00:00 +0000 https://th3b0ywh0l1v3d.github.io/ctf/dalctf-2026/crypto/lcg-seed-squared/ Sat, 06 Jun 2026 00:00:00 +0000 https://th3b0ywh0l1v3d.github.io/ctf/dalctf-2026/crypto/lcg-seed-squared/ A homemade LCG-as-cipher multiplies each flag byte by a deterministic state independent of the plaintext — the known DalCTF{ prefix recovers one state, and replaying the generator divides out the rest. The lost seed is a red herring.