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Trigrams

Tool to analyze trigrams appearance frequency in a message. A trigram is the association of 3 characters, usually 3 letters that appear consecutively in a message.

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Trigrams -

Tag(s) : Cryptanalysis

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# Trigrams

## Trigrams Frequency Analysis

### Trigrams Parameters

 Analyze by Blocks (ABCDEF => ABC,DEF) by sliding/overlapping (ABCDEF => ABC,BCD,CDE,DEF)

### Action

 Compute Frequencies Count Appearances List missing letters/ngrams Count triple trigrams (AAA, BBB, ...) Monoalphabetic Decryption

### How to analyse trigrams?

Trigrams (groups of three 3 letters) are used in some encryptions in cryptography. There are 2 main modes of appearance of trigrams:

- A trigram can appear when a single character (or a bigram) is encrypted by 3 characters.

Example: A can become 'BCD', or AB can become CDE

- A trigram can be derived from the encryption of another trigram

Example: ABC can become DEF

### What are the most common trigrams in english?

The top 100 trigrams that appear in the english language are :

THE AND ING HER 1.87% 0.78% 0.69% 0.42% 0.37% 0.36% 0.33% 0.33% 0.32% 0.32% 0.31% 0.29% 0.28% 0.27% 0.26% 0.26% 0.26% 0.26% 0.25% 0.24% 0.24% 0.24% 0.24% 0.24% 0.23% 0.23% 0.23% 0.22% 0.22% 0.22% 0.21% 0.21% 0.21% 0.2% 0.2% 0.19% 0.19% 0.18% 0.18% 0.18% 0.18% 0.18% 0.18% 0.17% 0.17% 0.17% 0.17% 0.17% 0.16% 0.16% 0.16% 0.16% 0.16% 0.16% 0.16% 0.16% 0.16% 0.16% 0.15% 0.15% 0.15% 0.15% 0.15% 0.15% 0.15% 0.15% 0.15% 0.15% 0.15% 0.15% 0.15% 0.15% 0.14% 0.14% 0.14% 0.14% 0.14% 0.14% 0.14% 0.14% 0.14% 0.13% 0.13% 0.13% 0.13% 0.13% 0.13% 0.13% 0.13% 0.13% 0.13% 0.13% 0.13% 0.13% 0.13% 0.13% 0.13% 0.12% 0.12% 0.12%

For information/comparison, in French language it is:

ENT LES QUE EDE 0.84% 0.77% 0.62% 0.61% 0.56% 0.43% 0.42% 0.41% 0.41% 0.41% 0.4% 0.39% 0.38% 0.37% 0.37% 0.37% 0.37% 0.36% 0.35% 0.34% 0.33% 0.33% 0.32% 0.31% 0.3% 0.3% 0.29% 0.28% 0.28% 0.28% 0.28% 0.27% 0.27% 0.27% 0.27% 0.26% 0.26% 0.25% 0.25% 0.25% 0.25% 0.25% 0.25% 0.24% 0.24% 0.24% 0.23% 0.23% 0.23% 0.22% 0.22% 0.22% 0.22% 0.21% 0.21% 0.21% 0.21% 0.21% 0.21% 0.2% 0.2% 0.2% 0.2% 0.2% 0.2% 0.2% 0.2% 0.2% 0.2% 0.2% 0.2% 0.2% 0.2% 0.19% 0.19% 0.19% 0.19% 0.19% 0.19% 0.19% 0.19% 0.19% 0.19% 0.19% 0.19% 0.18% 0.18% 0.18% 0.17% 0.17% 0.17% 0.17% 0.17% 0.17% 0.16% 0.16% 0.16% 0.16% 0.16% 0.16%

## Source code

dCode retains ownership of the online 'Trigrams' tool source code. Except explicit open source licence (indicated CC / Creative Commons / free), any 'Trigrams' algorithm, applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any 'Trigrams' function (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and no data download, script, copy-paste, or API access for 'Trigrams' will be for free, same for offline use on PC, tablet, iPhone or Android ! dCode is free and online.

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