Atbash Cipher Decoder
An Atbash decoder applies the same mirror swap as encryption. Because Atbash is self-inverse, “decoder” and “encoder” are identical operations—searchers often say Atbash translator when they want instant reversal.
How to decode Atbash
Map A↔Z, B↔Y, C↔X through the alphabet. Any tool that accepts a fixed substitution tableau can decrypt Atbash ciphertext. On paper, write the alphabet and its reverse above it.
Read the Atbash guide for historical context.
Atbash decoder online workflow
Until a one-click Atbash button ships, build the reverse alphabet as a 26-character substitution key on Cipher Portal (A→Z, B→Y, …) or decode mentally for short puzzles.
For frequency practice, Atbash ciphertext still looks like English shifted by mirror statistics—see the Frequency Lab.
Decoder pitfalls
Students sometimes apply Caesar shifts to Atbash ciphertext—mirror reversal is not a uniform rotation. If 26 Caesar trials fail but substitution frequency still looks English-shaped, test the Atbash tableau.
Hebrew scholarship uses different alphabets; Latin-letter puzzles on this site assume A–Z Atbash as shown in the examples page.
- Plaintext
- HELLO
- Rule
- A↔Z mirror
- Ciphertext
- SVOOL
Frequently asked questions
How do I decode Atbash online?
Apply the alphabet reversal map; use substitution mode on Cipher Portal with the Atbash tableau.
What is an Atbash translator?
Any tool that converts text using the Atbash mirror—encryption and decryption are the same operation.
Is Atbash used in the Bible?
Scholars discuss Atbash-style wordplay in some Hebrew texts; Latin-letter demos use the same reversal idea.
Can frequency analysis break Atbash?
Yes—Atbash is monoalphabetic; histograms remain English-shaped under relabeling.
Try substitution on Cipher Portal with the Atbash alphabet mapping.