Decipher substitution ciphers with mathematical precision
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Franklin D. Roosevelt (Historical Speeches)
FYN BXGK FYRXZ MN YCIN FB HNCD RE HNCD RFENGH.
Daily Quote Cryptogram
Letter Conflict Detected
Multiple cipher letters are assigned to the same plaintext letter.
Philosophy Cryptogram · Franklin D. Roosevelt
Instructions: Each letter in the ciphertext stands for another letter in the alphabet. All instances of a cipher letter represent the same plaintext letter. Punctuation and spaces are preserved.
Decryption Complete!
You cracked the substitution cipher!
Substitution Rail & Keypad
On-Screen Mobile Keyboard
Letter Frequency Distribution
Click any bar to highlight matching ciphertext letters across the worksheet.
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Everything you need to master monoalphabetic substitution ciphers, newspaper puzzles, and Aristocrats.
Dynamic Letter Frequency
Visualize single-letter counts alongside standard reference tables to isolate high-frequency vowels and consonants.
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Filter thousands of dictionary words by letter recurrence patterns (like 0.1.2.0 for "THAT") to crack tough words.
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A structured deduction process based on English letter frequencies and syntax.
Read the complete solving guide →Decipher substitution ciphers with mathematical precision
Enter any encrypted cipher puzzle to reveal frequencies, discover matching word patterns, or let our constraint solver decode quotes instantly.