Columnar Transposition Cipher

How Columnar Transposition Cipher works

Columnar Transposition Cipher handles all characters by writing them across keyword-width rows and reading columns in stable alphabetical key order, including repeated key letters. Column ranks use the key letter and original index as a stable tie-breaker. Decoding reconstructs the unequal final-column lengths before reading rows. The Columnar Transposition Cipher exposes its message, column keyword, operation controls so this particular convention stays inspectable instead of hiding behind an unexplained preset.

WEAREDISCOVEREDFLEEATONCE under ZEBRAS yields EVLNACDTESEAROFODEECWIREE, the familiar no-padding columnar example, and reverses exactly. Cipher learners can test ragged final rows and see why column lengths depend on original positions rather than sorted positions. The Columnar Transposition Cipher presents a deterministic plain-text result that can be copied and compared with the worked value before it enters another workflow.

Limits and private processing

Whitespace and punctuation are intentionally transposed as real characters. Columnar transposition conceals order only and is not suitable for protecting information. The Columnar Transposition Cipher performs its complete operation locally in your browser; neither the source text nor its settings are uploaded, stored remotely, or sent through an external request.