Tool to decrypt/encrypt with input mode Multi-tap (or ABC code or Tap mode) used in mobile phones to type text/SMS on a keyboard with a numeric keypad.
Multi-tap Phone (SMS) - dCode
Tag(s) : Telecom, Polygrammic Cipher
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Multitap ABC should not be confused with T9 predictive text. 'DCODE' is written '3222666333' in Multitap and '32633' in T9.
The correspondence table is:
Example: DCODE becomes 3222666333
This standard also has the name of E.161 created by the ITU Telecommunication Standardization Sector (ITU-T). It only sets letters from A to Z, other characters such as digits or lowercase uppercase distinctions are not normalized.
Multi-tap decryption consists in replacing groups of numbers by their corresponding letter, but if there is no separator, then it is necessary to test all the possibilities of words and only return the existing words in the dictionary.
Example: 2222 = AAAA or AAB or ABA or AC or BAA or BB or CA
The ciphered message is made of numbers with digits often repeated consecutively, between 1 and 3 times, there are few (or none) 1 or 0.
With new smartphones, this mode has become obsolete and is often used as a simplistic cipher.
Variations of the multi-tap ABC can be created by varying the writing.
Example: A code such as 222 can be written 2*3, 2^3 or 23.
An over-encryption is possible by coding a message twice
Example: PHONE = 7446666633 = PGGMMMMMDD
Mobile phones have other typing techniques, such as T9 predictive text.
The first patent is from 1985. It has since been used in the majority of mobile phones keypad, had its heyday with the Nokia, and then disappeared with touch screens and smartphones type iphone.
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Cite as source (bibliography):
Multi-tap Phone (SMS) on dCode.fr [online website], retrieved on 2022-08-08,