Übchi

A double columnar transposition cipher that uses the same key, but adds a number of pad characters. Used by the Germans in World War I.

During World War I, the Germans used a double columnar transposition cipher called Übchi ("ubchi" with umlauts). For a bit more information about columnar transposition ciphers, see that cipher's page. This method is surprisingly similar to the U.S. Army's double columnar transposition, also used during World War I.

Examples:

Operating mode:

Alphabet:

Columnar key:

Number duplicate entries backwards instead of forwards

Use the key as a column order instead of column labels

Enter numbers or words to generate a column key

Charcter to use when padding the message:

Remove: letters, numbers, whitespace, other things
Change: lowercase, Natural case, Title Case, UPPERCASE, swap case, reverse
Make groups of and next line after groups

You need at least two columns in order to encode anything