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Numeric Keypad Draw

Tool for decrypting / encrypting codes representing matrix drawings on the keypad (computer or telephone)

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Numeric Keypad Draw -

Tag(s) : Cryptography, Substitution Cipher, Informatics

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Numeric Keypad Draw

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Keypad Drawing Decoder





Keypad Drawing Encoder





Tool for decrypting / encrypting codes representing matrix drawings on the keypad (computer or telephone)

Answers to Questions

How to encrypt using keypad drawing cipher?

Encryption with a numeric keypad consists of drawing each character via a 3x3 (or 3x4) dot matrix symbolized by the keypad itself.

Example: To encrypt the letters D,C,O,D,E, imagine using the numeric keypad of a computer and the keys 78 | 89 | 789 | 78 | 789
4 5 | 4 | 4 6 | 4 5 | 45
12 | 23 | 123 | 12 | 123

The order of the keys is usually not important, but can help to recognize the drawn character.

Example: D can be encoded 124578

The computer numeric keypad and cell phone keypad have inverted digits (123 is at the bottom for one and at the top for the other one). The phone mode also accepts the characters * (star), 0 (zero) and # (pound).

How to decrypt keypad drawing cipher?

Decryption requires the knowledge of the numeric keypad used and to note the keys in order to deduce the drawing of a character.

Example: From the message 1478965,14789635,147862, can be infered the drawings:
789 | 789 | 78
456 | 456 | 4 5
1 | 1 3 | 12
thus, the plain message is PAD.

How to recognize a keypad ciphertext?

The message consists of the characters of a numeric keypad, namely 123456789*0#

What are the possible combinations?

Numeric codes that draw a symbol on a 3x3 9-digit grid are limited:

1-digit combinationshref

Example: 1, 2, 3, 4, 5, 6, 7, 8, 9

2-digit combinationshref

Example: 12, 13, 14, 15, 16, 17, 18, 19, 23, 24, 25, 26, 27, 28, 29, 34, 35, 36, 37, 38, 39, 45, 46, 47, 48, 49, 56, 57, 58, 59, 67, 68, 69, 78, 79, 89

3-digit combinationshref

Example: 123, 124, 125, 126, 127, 128, 129, 134, 135, 136, 137, 138, 139, 145, 146, 147, 148, 149, 156, 157, 158, 159, 167, 168, 169, 178, 179, 189, 234, 235, 236, 237, 238, 239, 245, 246, 247, 248, 249, 256, 257, 258, 259, 267, 268, 269, 278, 279, 289, 345, 346, 347, 348, 349, 356, 357, 358, 359, 367, 368, 369, 378, 379, 389, 456, 457, 458, 459, 467, 468, 469, 478, 479, 489, 567, 568, 569, 578, 579, 589, 678, 679, 689, 789

4-digit combinationshref

Example: 1234, 1235, 1236, 1237, 1238, 1239, 1245, 1246, 1247, 1248, 1249, 1256, 1257, 1258, 1259, 1267, 1268, 1269, 1278, 1279, 1289, 1345, 1346, 1347, 1348, 1349, 1356, 1357, 1358, 1359, 1367, 1368, 1369, 1378, 1379, 1389, 1456, 1457, 1458, 1459, 1467, 1468, 1469, 1478, 1479, 1489, 1567, 1568, 1569, 1578, 1579, 1589, 1678, 1679, 1689, 1789, 2345, 2346, 2347, 2348, 2349, 2356, 2357, 2358, 2359, 2367, 2368, 2369, 2378, 2379, 2389, 2456, 2457, 2458, 2459, 2467, 2468, 2469, 2478, 2479, 2489, 2567, 2568, 2569, 2578, 2579, 2589, 2678, 2679, 2689, 2789, 3456, 3457, 3458, 3459, 3467, 3468, 3469, 3478, 3479, 3489, 3567, 3568, 3569, 3578, 3579, 3589, 3678, 3679, 3689, 3789, 4567, 4568, 4569, 4578, 4579, 4589, 4678, 4679, 4689, 4789, 5678, 5679, 5689, 5789, 6789

5-digit combinationshref

Example: 12345, 12346, 12347, 12348, 12349, 12356, 12357, 12358, 12359, 12367, 12368, 12369, 12378, 12379, 12389, 12456, 12457, 12458, 12459, 12467, 12468, 12469, 12478, 12479, 12489, 12567, 12568, 12569, 12578, 12579, 12589, 12678, 12679, 12689, 12789, 13456, 13457, 13458, 13459, 13467, 13468, 13469, 13478, 13479, 13489, 13567, 13568, 13569, 13578, 13579, 13589, 13678, 13679, 13689, 13789, 14567, 14568, 14569, 14578, 14579, 14589, 14678, 14679, 14689, 14789, 15678, 15679, 15689, 15789, 16789, 23456, 23457, 23458, 23459, 23467, 23468, 23469, 23478, 23479, 23489, 23567, 23568, 23569, 23578, 23579, 23589, 23678, 23679, 23689, 23789, 24567, 24568, 24569, 24578, 24579, 24589, 24678, 24679, 24689, 24789, 25678, 25679, 25689, 25789, 26789, 34567, 34568, 34569, 34578, 34579, 34589, 34678, 34679, 34689, 34789, 35678, 35679, 35689, 35789, 36789, 45678, 45679, 45689, 45789, 46789, 56789

6-digit combinationshref

Example: 123456, 123457, 123458, 123459, 123467, 123468, 123469, 123478, 123479, 123489, 123567, 123568, 123569, 123578, 123579, 123589, 123678, 123679, 123689, 123789, 124567, 124568, 124569, 124578, 124579, 124589, 124678, 124679, 124689, 124789, 125678, 125679, 125689, 125789, 126789, 134567, 134568, 134569, 134578, 134579, 134589, 134678, 134679, 134689, 134789, 135678, 135679, 135689, 135789, 136789, 145678, 145679, 145689, 145789, 146789, 156789, 234567, 234568, 234569, 234578, 234579, 234589, 234678, 234679, 234689, 234789, 235678, 235679, 235689, 235789, 236789, 245678, 245679, 245689, 245789, 246789, 256789, 345678, 345679, 345689, 345789, 346789, 356789, 456789

7-digit combinationshref

Example: 1234567, 1234568, 1234569, 1234578, 1234579, 1234589, 1234678, 1234679, 1234689, 1234789, 1235678, 1235679, 1235689, 1235789, 1236789, 1245678, 1245679, 1245689, 1245789, 1246789, 1256789, 1345678, 1345679, 1345689, 1345789, 1346789, 1356789, 1456789, 2345678, 2345679, 2345689, 2345789, 2346789, 2356789, 2456789, 3456789

8-digit combinationshref

Example: 12345678, 12345679, 12345689, 12345789, 12346789, 12356789, 12456789, 13456789, 23456789

9-digit combinationhref

Example: 123456789

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