Letter frequency

Those Letter frequency is one statistic Size, in that Decoding of Substitution procedure in that Cryptology (more exactly that Cryptanalysis) one uses. The frequency distribution of the letters is of Language to language differently. The statistic distribution of the letter frequency at the upper places becomes of Zipf law predicted.

Application

With simple Coding procedure as for example that Caesarchiffre can Text alone through Frequency analysis are decoded. The frequentnesses of the particulars becomes Indication in Geheimtext determined, and then with the frequency of the indications in German Plain language compared. Now those become Letter the geheimtextes by the "normal" letters of same frequency replaces. This Method functioned better, the longer the text which can be decoded is, because by it those statistic Deviation becomes smaller.

For typing instruction (see Palpation letter) it is uncommonly important, that the instructor about the letter frequency in a language is well informed and instruction contents with it to be co-ordinated accordingly. Frequent letters like the E or the I must be trained sufficiently around as high a notice number and a good write security as possible to obtain.

Continuation

The continuation of the letter frequency is the frequency of Pairs of letters and tripeln.

Frequentnesses of the German language

See also: Wikipedia:WikiProjekt cryptology