Cipher Tools
Browse all available cipher tools.
Available tools
- Playfair Cipher Decoder Decrypt even-length Playfair ciphertext using a 5×5 key square. Output preserves filler letters because removal is ambiguous without context.
- Playfair Cipher Encoder Encrypt letters with the classical 5×5 Playfair square, merging J into I and inserting X (or Q after X) between repeated digraph letters. This historical cipher is not secure.