Straddling Checkerboard Builder
Build caller-ordered straddling checkerboard with eight single-digit positions and two ten-digit rows, truncate 28 available cells to26 letters. Classical educational encoding only; not secure encryption, no hidden normalization or inferred key.
Description
A straddling checkerboard assigns short and long digit codes to alphabet positions.
A straddling checkerboard assigns short and long digit codes to alphabet positions.1
Its blank-column choices and alphabet order must be retained for interpreting the returned code list. Use Straddling Checkerboard Builder to evaluate the supplied inputs under the specific model below.
When to use Straddling Checkerboard Builder
Use Straddling Checkerboard Builder 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 Straddling Checkerboard Builder and understand its results
- Choose the intended encoding, alphabet or check and keep the exact character, key and measurement conventions described below.
- Enter Caller alphabet, Caller blank column digits using the field table and validation rules below, then run the tool.
- Read Checkerboard letter codes 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 |
|---|---|---|---|
| callerAlphabet | Caller alphabet | string | Required; constraints below |
| callerBlankColumnDigits | Caller blank column digits | array of number | Required; constraints below |
Enter a 26-symbol permutation of distinct uppercase ASCII letters or digits and exactly two distinct blank-column digits from 0 to 9. Assign one-digit codes to the eight remaining digits in ascending order, then two-digit codes under each blank prefix in the caller's order, using suffixes 0 through 9. Return the first 26 codes, aligned to the supplied alphabet; no message is encoded.
codes = available single digits, then blankPrefix1×[0..9], then blankPrefix2×[0..9]; take 26 Field order, units and branch conditions follow the implementation explanation above.
| Output field | Meaning | Value type |
|---|---|---|
| checkerboardLetterCodes | Checkerboard letter codes | array of string |
{
"input": {
"callerAlphabet": "ABCDEFGHIJKLMNOPQRSTUVWXYZ",
"callerBlankColumnDigits": [
2,
6
]
},
"output": {
"checkerboardLetterCodes": [
"0",
"1",
"3",
"4",
"5",
"7",
"8",
"9",
"20",
"21",
"22",
"23",
"24",
"25",
"26",
"27",
"28",
"29",
"60",
"61",
"62",
"63",
"64",
"65",
"66",
"67"
]
}
}Limitations and assumptions
Its blank-column choices and alphabet order must be retained for interpreting the returned code list. 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 AD FGVX Cipher Tool for a related task: ADFGVX uses a six-by-six symbol square before keyed column transposition.
Use Polybius Square Coordinate Lookup for a related task: A Polybius square maps symbols to row and column coordinates.
References
-
Straddling Checkerboard Builder — tool.io
Similar or alternative tools
- AD FGVX Cipher Tool
ADFGVX uses a six-by-six symbol square before keyed column transposition.
- Polybius Square Coordinate Lookup
A Polybius square maps symbols to row and column coordinates.