The Weekly Cipher is The Cipher Lab’s rotating cryptographic challenge.
Each week, a new puzzle is released — ranging from simple substitution ciphers
to advanced transpositions and polyalphabetic encryption.
🔐 Weekly Challenges
Every Monday, a new cipher is posted. You can solve it and submit your plaintext or keyword.
Correct answers earn points — faster solves earn more.
🏆 Seasons
The year is divided into multiple seasons (each lasting a few months).
Seasonal leaderboards reset at the start of each season, giving everyone a fresh chance to climb.
⚡ Fastest Weekly Solvers
Each week, the quickest correct submissions are featured on the Weekly Fastest board —
rewarding both speed and accuracy. Only your fastest solve per week counts.
📊 All-Time Rankings
Your total score across all seasons is tracked in the All-Time Leaderboard,
showcasing the most consistent and dedicated solvers.
💡 Hints & Scoring
Some puzzles may include hints. These are typically released later, allowing solvers time to work through the challenge without guidance first.
🧠 Tip: Each challenge may use different classical ciphers — Caesar, Vigenère, Affine,
Railfence, AMSCO, or others. Pay attention to patterns, letter frequencies, and clues in the text.
New puzzles appear every Monday at 12:00 UTC — good luck, and happy decrypting!