func findBestCypher(bytes []byte) byte {
var best Candidate
for i := 0; i < 256; i++ {
cypher := byte(i)
decoded := matasano.FixedXorWithSingleByteMask(bytes, cypher)
phrase := string(decoded)
englishness := getLetterDensity(phrase)
if best.englishness < englishness {
best = Candidate{englishness, phrase, cypher, 0}
}
}
return best.cypher
}
func findCandidate(c chan<- Candidate, bytes []byte, line int) {
var best Candidate
for i := 0; i < 256; i++ {
cypher := byte(i)
decoded := matasano.FixedXorWithSingleByteMask(bytes, cypher)
phrase := string(decoded)
englishness := 1 / stdDevFromCharFrequencies(phrase)
if best.englishness < englishness {
best = Candidate{englishness, phrase, cypher, line}
}
}
c <- best
}