private static double GetCoincidenceIndex(EncodedText et)
{
Dictionary <char, long> lettersOccurences = CoincidenceKeyLengthAnalyzer.GetLettersOccurrences(et);
long sum = 0;
foreach (KeyValuePair <char, long> letterOccurrences in lettersOccurences)
{
sum += letterOccurrences.Value * letterOccurrences.Value;
}
return((double)sum / (et.Length * et.Length));
}
private List <KeyValuePair <char, long> > GetOftenLetters()
{
Dictionary <char, long> occurrences = CoincidenceKeyLengthAnalyzer.GetLettersOccurrences(encodedText);
List <KeyValuePair <char, long> > result = new List <KeyValuePair <char, long> >();
foreach (KeyValuePair <char, long> occurrence in occurrences)
{
result.Add(new KeyValuePair <char, long>(occurrence.Key, occurrence.Value));
}
result.Sort((firstPair, nextPair) => {
return(nextPair.Value.CompareTo(firstPair.Value));
});
/*
* for (int i = 10; result.Count > i; ) {
* result.RemoveAt(i);
* }
*/
return(result);
}