Double Transposition Cipher (online tool) | Boxentriq

The duplicate columnar transposition cipher is considered one of the most secure ciphers that can be performed by hand. It is equivalent to using two columniform substitution ciphers, with like or unlike keys. During World War I and II, it was used by versatile agents and military forces .

Double Transposition Cipher Tool

You must enter the message .


You must enter the encoding key .
You must enter the encoding key .

Auto Solve Options

Min Key Length

Max Key Length
Max Results
Spacing Mode


You can decode ( decode ) or encode ( code ) your message with your key. If you do n’t have any key, you can try to car clear ( break ) your cipher .

  • Language: The language determines the letters and statistics used for decoding, encoding and auto solving.
  • Min/Max Key Length: This is the search range for keys when auto solving a cipher.
  • Max Results: This is the maximum number of results you will get from auto solving.
  • Spacing Mode: This is about the spaces (word breaks) in the text. In most cases it should be set to Automatic. In case a specific letter (for instance X) is used as word separator, set it to Substitute.


Auto Solve results

Score Key Text

still not seeing the correct result ? then try experimenting with the Auto Solve settings or use the Cipher Identifier Tool .


Enter the key and click decode or encode to show.


  • The double transposition cipher is an example of transposition cipher.
  • Until the VIC cipher, the double transposition cipher was considered as the most complicated cipher that an agent could operate reliably by hand.
  • It can encrypt any characters, including spaces and punctuation, but security is increased if spacing and punctuation is removed.
  • The message does not always fill up the whole transposition grid. The remaining of the transposition grid can then optionally be filled with a padding
    character, or left blank.
  • If the same key is used for encrypting multiple messages of the same length, they can be compared and attacked using a method called “multiple anagramming”,
    finding solutions to both.

Sample Double Columnar Transposition Cipher Text

Code-breaking is not only fun, but besides a very good exercise for your mind and cognitive skills. Why preceptor ’ metric ton you try breaking this model cipher :
htdre anwac aedot dnahk liolr rtiao saaer ioooi elroh dwyha aedee wtian ndten rkerc tdtod tnmti setlm mdoni yrngs wfegt ghyer emeas yhneh sde

generator :
Category : crypto topics

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