digram frequency cryptanalysis - meaning and definition. What is digram frequency cryptanalysis
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What (who) is digram frequency cryptanalysis - definition

STUDY OF THE FREQUENCY OF LETTERS OR GROUPS OF LETTERS IN A CIPHERTEXT
Frequency Analysis; Etaoi; Frequency analysis (cryptanalysis); Letter frequency analysis
  • First page of [[Al-Kindi]]'s 9th century ''Manuscript on Deciphering Cryptographic Messages''
  • Part of the cryptogram in ''The Dancing Men''
  • A typical distribution of letters in [[English language]] text. Weak ciphers do not sufficiently mask the distribution, and this might be exploited by a cryptanalyst to read the message.
  • Letter frequency in Spanish
  • [[Arabic Letter Frequency]] distribution

Frequencies         
  • Diagram of the relationship between the different types of frequency and other wave properties.
  • Complete spectrum of [[electromagnetic radiation]] with the visible portion highlighted
  • Modern frequency counter
  • Hz]]
  • The [[sound wave]] spectrum, with rough guide of some applications
NUMBER OF OCCURRENCES OR CYCLES PER TIME
Wave period; Frequencies; Period (physics); Frequency (wave motion); Frequency dependence; Oscillation frequency; Frekvens; Periodic time; Frequency measurement; Period (frequency); Temporal frequency; Repetition frequency; Occurrence frequency; Event frequency; Oscillation rate; Repetition rate; Occurrence rate; Event rate; Rate of occurrence; Rate of repetition; Rate of oscillation; Wave frequency; Ordinary frequency; Aperiodic frequency
·pl of Frequency.
Digram         
WIKIMEDIA DISAMBIGUATION PAGE
Digram (disambiguation); Digramme
·noun A Digraph.
Frequency analysis         
In cryptanalysis, frequency analysis (also known as counting letters) is the study of the frequency of letters or groups of letters in a ciphertext. The method is used as an aid to breaking classical ciphers.

Wikipedia

Frequency analysis

In cryptanalysis, frequency analysis (also known as counting letters) is the study of the frequency of letters or groups of letters in a ciphertext. The method is used as an aid to breaking classical ciphers.

Frequency analysis is based on the fact that, in any given stretch of written language, certain letters and combinations of letters occur with varying frequencies. Moreover, there is a characteristic distribution of letters that is roughly the same for almost all samples of that language. For instance, given a section of English language, E, T, A and O are the most common, while Z, Q, X and J are rare. Likewise, TH, ER, ON, and AN are the most common pairs of letters (termed bigrams or digraphs), and SS, EE, TT, and FF are the most common repeats. The nonsense phrase "ETAOIN SHRDLU" represents the 12 most frequent letters in typical English language text.

In some ciphers, such properties of the natural language plaintext are preserved in the ciphertext, and these patterns have the potential to be exploited in a ciphertext-only attack.