Route Spiral Transposition Tool
Clockwise top-left inward spiral read of exact row-major rectangle, explicit inverse. Classical educational encoding only; not secure encryption, no hidden normalization or inferred key.
Description
A spiral route reads cells around a filled rectangle in a chosen direction.
A spiral route reads cells around a filled rectangle in a chosen direction.1
Grid dimensions and the starting corner are part of the cipher convention. Use Route Spiral Transposition Tool to evaluate the supplied inputs under the specific model below.
When to use Route Spiral Transposition Tool
Use Route Spiral Transposition Tool to evaluate the supplied inputs under the specific model below. Choose the intended encoding, alphabet or check and keep the exact character, key and measurement conventions described below.
How to use Route Spiral Transposition Tool and understand its results
- Choose the intended encoding, alphabet or check and keep the exact character, key and measurement conventions described below.
- Enter Text, Rows, Columns, Decode using the field table and validation rules below, then run the tool.
- Read Transformed and interpret units, signs, ordering and placeholders as explained below.
- If the tool reports an input error, correct that field and rerun. A successful false result, empty match list or unknown-evidence placeholder has the specific meaning described here; check the limitations before applying the result.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| text | Text | string | Required; constraints below |
| rows | Rows | number | Required; constraints below |
| columns | Columns | number | Required; constraints below |
| decode | Decode | boolean | Required; constraints below |
Enter positive integer rows and columns no greater than 64, uppercase A–Z text whose length exactly equals their product and a decode flag. Enumerate a clockwise spiral from the top-left corner, starting across the top row. Encoding reads a row-major grid along that route; decoding puts symbols along the route and returns row-major text. No padding or alternative route is inferred.
encode = rowMajorText indexed by clockwise top-left spiral; decode applies inverse index permutation Field order, units and branch conditions follow the implementation explanation above.
| Output field | Meaning | Value type |
|---|---|---|
| transformed | Transformed | string |
{
"input": {
"text": "ABCDEFGHI",
"rows": 3,
"columns": 3,
"decode": false
},
"output": {
"transformed": "ABCFIHGDE"
}
}Limitations and assumptions
Grid dimensions and the starting corner are part of the cipher convention. Apply the exact scope and assumptions described above.
All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse arrays fail validation. Domain-specific bounds, alignments and supported tokens are stated above; extremely large inputs or outputs can also be rejected. These errors differ from successful results such as false, no matches or unknown evidence.
This educational transformation or format check does not establish modern cryptographic confidentiality, authentication or key security.
Alternative or Complementary methods
Use Transposition Column-Count Candidate List for a related task: A column-transposition hypothesis assigns text to a rectangular or ragged grid.
Use Columnar Transposition Encryptor for a related task: Columnar transposition reads columns in key-defined order.
References
-
Route Spiral Transposition Tool — tool.io
Similar or alternative tools
- Transposition Column-Count Candidate List
A column-transposition hypothesis assigns text to a rectangular or ragged grid.
- Columnar Transposition Encryptor
Columnar transposition reads columns in key-defined order.