//iterate all rotation from 0 to 25, each variant checking in english words in database.
//return variant who has maximum matches.
public static int tryDecrypt(string ciphertext)
{
int resultRotation = -1;
int maxMatches = 0;
using (DatabaseWordsEntities db = new DatabaseWordsEntities())
{
for (short i = 0; i < 26; i++)
{
string decryptStr = Encrypt(ciphertext, i, false);
string[] words = decryptStr.Split(new[] { ' ', ',', ':', '?', '!' }, StringSplitOptions.RemoveEmptyEntries);
int matches = db.Words.Where(getPredicate(words).Compile()).Count();
if (matches > maxMatches)
{
if (matches > 4)
{
return(i); //if found many matches not sense to find more
}
maxMatches = matches;
resultRotation = i;
}
}
}
return(resultRotation);
}
//iterate all rotation from 0 to 25, each variant checking in english words in NHunspell lib.
//return variant who has maximum matches.
public static int tryDecryptWithoutDatabase(string ciphertext)
{
int resultRotation = -1;
int maxMatches = 0;
using (DatabaseWordsEntities db = new DatabaseWordsEntities())
{
for (short i = 0; i < 26; i++)
{
string decryptStr = Encrypt(ciphertext, i, false);
int matches = Speller.Analyze(decryptStr);
if (matches > maxMatches && matches > 0)
{
maxMatches = matches;
resultRotation = i;
}
}
}
return(resultRotation);
}