ACTS: A Multi-Tier Benchmark Evaluating LLM Cipher Identification under Controlled Blind Conditions

We introduce ACTS Artifacts in Cipher Testing Suite, a reproducible benchmark that isolates cryptanalytic ability through tiered metadata deprivation Tier-1: full metadata; Tier-2: filename only; Tier-3: completely blind and tests forced reasoning Tier-5: chain-of-thought, code-as-reasoning,...