Today
six puzzles, fresh every day — 2026-10-11
Passcodetoday's topic: Cryptographycodes, secrets, and proofs — think ciphers, keys, hashes, and encryptionMinitoday's topic: AI & Machine Learningteaching machines from data — think models, training, neurons, and predictionsHexdumptoday's topic: IoT & Embeddedtiny computers inside everyday things — think sensors, firmware, chips, and signalsTraceroutetoday's topic: Cybersecurityattacks and defenses — think malware, firewalls, phishing, and the tools of both sidesGreptoday's topic: Databases & Data Engstoring and finding data — think tables, queries, indexes, and transactionsBrute Forcetoday's topic: Privacy & Data Protectionwho gets to know what about you — think consent, tracking, anonymity, and data rights
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