Tool to decrypt/encrypt with T9 for mobile phone. T9 (Text on 9 keys) is a predictive text method based on a dictionary, used in mobile phones to type text on a keyboard with only numeric keys.
T9 Cipher (SMS) - dCode
Tag(s) : Telecom, Substitution Cipher
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T9 Cipher (SMS)
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T9 Decoder
T9 Encoder
Textonym list
Tool to decrypt/encrypt with T9 for mobile phone. T9 (Text on 9 keys) is a predictive text method based on a dictionary, used in mobile phones to type text on a keyboard with only numeric keys.
Answers to Questions
How to encrypt using T9 cipher?
Encryption replaces a letter by the corresponding key code on a mobile phone keypad (compatible with Text on 9 keys).
Example: DCODE becomes 32633
Do not confuse the T9 with the multi-tap code (successively press the keys until you get the correct letter)
How to decrypt T9 cipher?
The decryption of the T9 is normally based on a dictionary where all the words have been previously encoded.
It is normally impossible to write a word that does not exist but the dCode T9 translator in brute-force mode will test all the possibilities of words.
Example: 22 = AA,AB,AC,BA,BB,BC,CA,CB,CC
How to recognize T9 ciphertext?
The ciphered message is made of digits, if there are 1 or 0, these digits can only code spaces or punctuation.
What are the variants of the T9 cipher?
Mobile phones have other typing techniques, such as Multi-tap code (ABC mode). With the same keyboard, DCODE is written 3222666333.
What is a Textonym?
A textonym is the name given to each word written in the same manner in T9.
COOL = 2665 = BOOK
Textonym list
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When T9 have been invented ?
Patent is from 1985
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Source code
dCode retains ownership of the source code of the script T9 Cipher (SMS) online. Except explicit open source licence (indicated Creative Commons / free), any algorithm, applet, snippet, software (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt, encrypt, decipher, cipher, decode, code, translate) written in any informatic langauge (PHP, Java, C#, Python, Javascript, Matlab, etc.) which dCode owns rights will not be given for free. So if you need to download the online T9 Cipher (SMS) script for offline use, check contact page !
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