Bigrams (or digrams, couples of two letters) are used in various encryptions in cryptography. There are 2 main modes of use of bigrams:
- A bigram may appear when a single character is encrypted by 2 characters.
Example: The Polybius cipher encodes each letter with a bigram representing coordinates in a grid. A can become BC
This type of encryption can be broken by transforming it into a mono-alphabetic substitution.
- A bigram can come from the encryption of another bigram
Example: The Playfair cipher encodes the message by bigram by replacing it with another one. AB can become CD
The top 100 bigrams that appear in the english language are :
In english, digram and bigram means are the same thing: a couple of two characters. Bigram is the most common term.
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