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Multi-tap Cipher (SMS Mode ABC)

Tool to decrypt/encrypt ext with SMS phone Tap mode. Multi-tap (or ABC code) is an input text method used in mobile phones to type text on a keyboard with reduced number of keys.

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Multi-tap Cipher (SMS Mode ABC) -

Tag(s) : Communication, Substitution Cipher

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# Multi-tap Cipher (SMS Mode ABC)

## Multi-tap Encoder

Tool to decrypt/encrypt ext with SMS phone Tap mode. Multi-tap (or ABC code) is an input text method used in mobile phones to type text on a keyboard with reduced number of keys.

## Answers to Questions

### How to encrypt using Multitap cipher?

Encryption replaces a letter by repeated digits defined by the corresponding key code on a mobile phone.

Example: DCODE becomes 3222666333

### How to decrypt Multitap cipher?

Decryption requires a dictionary, it tests all possibilities and gives back only the one existing in a dictionary

Example: 2222 = AAAA, AAB, ABA, AC, BAA, BB, CA.

### How to recognize Multitap ciphertext?

The ciphered message is made of digits often repeated, between 1 and 3 times, there a few or none 1 or 0.

### What are the variants of the Multi-tap cipher?

A code such as 222 can be written 2*3, 2^3 or 23.

It is possible to cipher a message twice

Example: CLE = 22255533 = AAAJJJDD

Mobile phones have other typing techniques, such as T9 predictive text.

### When Multi-tap have been invented?

The first patent is from 1985.

## Source code

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## Questions / Comments

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