Week #1 — Welcome Cipher

Week #2 · Posted 2026-01-02 07:19:14
Ciphertext
BJQHTRJ YT YMJ HNUMJW QFG!
Work on this cipher in your personal lab with notes and tools.

Kickoff puzzle. Decrypt and submit the plaintext keyword.

Think Caesar…

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About the Weekly Cipher

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.

🧠 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!