1 files changed, 108 insertions, 0 deletions
diff --git a/p59/p_59.go b/p59/p_59.go
new file mode 100644
index 0000000..32d08c9
--- /dev/null
+++ b/p59/p_59.go
@@ -0,0 +1,108 @@
+
+package main
+import (
+  "fmt"
+  "math"
+)
+
+
+var cipher = [...]rune{79,59,12,2,79,35,8,28,20,2,3,68,8,9,68,45,0,12,9,67,68,4,7,5,23,27,1,21,79,85,78,79,85,71,38,10,71,27,12,2,79,6,2,8,13,9,1,13,9,8,68,19,7,1,71,56,11,21,11,68,6,3,22,2,14,0,30,79,1,31,6,23,19,10,0,73,79,44,2,79,19,6,28,68,16,6,16,15,79,35,8,11,72,71,14,10,3,79,12,2,79,19,6,28,68,32,0,0,73,79,86,71,39,1,71,24,5,20,79,13,9,79,16,15,10,68,5,10,3,14,1,10,14,1,3,71,24,13,19,7,68,32,0,0,73,79,87,71,39,1,71,12,22,2,14,16,2,11,68,2,25,1,21,22,16,15,6,10,0,79,16,15,10,22,2,79,13,20,65,68,41,0,16,15,6,10,0,79,1,31,6,23,19,28,68,19,7,5,19,79,12,2,79,0,14,11,10,64,27,68,10,14,15,2,65,68,83,79,40,14,9,1,71,6,16,20,10,8,1,79,19,6,28,68,14,1,68,15,6,9,75,79,5,9,11,68,19,7,13,20,79,8,14,9,1,71,8,13,17,10,23,71,3,13,0,7,16,71,27,11,71,10,18,2,29,29,8,1,1,73,79,81,71,59,12,2,79,8,14,8,12,19,79,23,15,6,10,2,28,68,19,7,22,8,26,3,15,79,16,15,10,68,3,14,22,12,1,1,20,28,72,71,14,10,3,79,16,15,10,68,3,14,22,12,1,1,20,28,68,4,14,10,71,1,1,17,10,22,71,10,28,19,6,10,0,26,13,20,7,68,14,27,74,71,89,68,32,0,0,71,28,1,9,27,68,45,0,12,9,79,16,15,10,68,37,14,20,19,6,23,19,79,83,71,27,11,71,27,1,11,3,68,2,25,1,21,22,11,9,10,68,6,13,11,18,27,68,19,7,1,71,3,13,0,7,16,71,28,11,71,27,12,6,27,68,2,25,1,21,22,11,9,10,68,10,6,3,15,27,68,5,10,8,14,10,18,2,79,6,2,12,5,18,28,1,71,0,2,71,7,13,20,79,16,2,28,16,14,2,11,9,22,74,71,87,68,45,0,12,9,79,12,14,2,23,2,3,2,71,24,5,20,79,10,8,27,68,19,7,1,71,3,13,0,7,16,92,79,12,2,79,19,6,28,68,8,1,8,30,79,5,71,24,13,19,1,1,20,28,68,19,0,68,19,7,1,71,3,13,0,7,16,73,79,93,71,59,12,2,79,11,9,10,68,16,7,11,71,6,23,71,27,12,2,79,16,21,26,1,71,3,13,0,7,16,75,79,19,15,0,68,0,6,18,2,28,68,11,6,3,15,27,68,19,0,68,2,25,1,21,22,11,9,10,72,71,24,5,20,79,3,8,6,10,0,79,16,8,79,7,8,2,1,71,6,10,19,0,68,19,7,1,71,24,11,21,3,0,73,79,85,87,79,38,18,27,68,6,3,16,15,0,17,0,7,68,19,7,1,71,24,11,21,3,0,71,24,5,20,79,9,6,11,1,71,27,12,21,0,17,0,7,68,15,6,9,75,79,16,15,10,68,16,0,22,11,11,68,3,6,0,9,72,16,71,29,1,4,0,3,9,6,30,2,79,12,14,2,68,16,7,1,9,79,12,2,79,7,6,2,1,73,79,85,86,79,33,17,10,10,71,6,10,71,7,13,20,79,11,16,1,68,11,14,10,3,79,5,9,11,68,6,2,11,9,8,68,15,6,23,71,0,19,9,79,20,2,0,20,11,10,72,71,7,1,71,24,5,20,79,10,8,27,68,6,12,7,2,31,16,2,11,74,71,94,86,71,45,17,19,79,16,8,79,5,11,3,68,16,7,11,71,13,1,11,6,1,17,10,0,71,7,13,10,79,5,9,11,68,6,12,7,2,31,16,2,11,68,15,6,9,75,79,12,2,79,3,6,25,1,71,27,12,2,79,22,14,8,12,19,79,16,8,79,6,2,12,11,10,10,68,4,7,13,11,11,22,2,1,68,8,9,68,32,0,0,73,79,85,84,79,48,15,10,29,71,14,22,2,79,22,2,13,11,21,1,69,71,59,12,14,28,68,14,28,68,9,0,16,71,14,68,23,7,29,20,6,7,6,3,68,5,6,22,19,7,68,21,10,23,18,3,16,14,1,3,71,9,22,8,2,68,15,26,9,6,1,68,23,14,23,20,6,11,9,79,11,21,79,20,11,14,10,75,79,16,15,6,23,71,29,1,5,6,22,19,7,68,4,0,9,2,28,68,1,29,11,10,79,35,8,11,74,86,91,68,52,0,68,19,7,1,71,56,11,21,11,68,5,10,7,6,2,1,71,7,17,10,14,10,71,14,10,3,79,8,14,25,1,3,79,12,2,29,1,71,0,10,71,10,5,21,27,12,71,14,9,8,1,3,71,26,23,73,79,44,2,79,19,6,28,68,1,26,8,11,79,11,1,79,17,9,9,5,14,3,13,9,8,68,11,0,18,2,79,5,9,11,68,1,14,13,19,7,2,18,3,10,2,28,23,73,79,37,9,11,68,16,10,68,15,14,18,2,79,23,2,10,10,71,7,13,20,79,3,11,0,22,30,67,68,19,7,1,71,8,8,8,29,29,71,0,2,71,27,12,2,79,11,9,3,29,71,60,11,9,79,11,1,79,16,15,10,68,33,14,16,15,10,22,73};
+
+var freq = map[rune]float64 {
+  'a': 8.167,
+  'b': 1.492,
+  'c': 2.782,
+  'd': 4.253,
+  'e': 12.702,
+  'f': 2.228,
+  'g': 2.015,
+  'h': 6.094,
+  'i': 6.966,
+  'j': 0.153,
+  'k': 0.772,
+  'l': 4.025,
+  'm': 2.406,
+  'n': 6.749,
+  'o': 7.507,
+  'p': 1.929,
+  'q': 0.095,
+  'r': 5.987,
+  's': 6.327,
+  't': 9.056,
+  'u': 2.758,
+  'v': 0.978,
+  'w': 2.360,
+  'x': 0.150,
+  'y': 1.974,
+  'z': 0.074,
+}
+
+func indexProb( plain []rune ) float64 {
+  pFreq:= make(map[rune]int);
+  nbC  := 0
+
+  for c := 'a' ; c <= 'z' ; c++ {
+    pFreq[c] = 0
+  }
+
+  for _,r := range plain {
+    if 'a' <= r && 'z' >= r {
+      pFreq[r]++
+      nbC += 1
+    } else if 'A' <= r && 'Z' >= r {
+      r = r+'a'-'A';
+      pFreq[r]++
+      nbC += 1
+    }
+  }
+
+
+  delta := float64(0)
+
+  for c := 'a' ; c <= 'z' ; c++ {
+    delta += math.Abs(freq[c] - float64(pFreq[c])/float64(nbC)*100)
+  }
+
+  return delta
+}
+
+func main() {
+
+  key := [3]rune{};
+  bestDelta := 1000000000.
+  bestKey := ""
+  plain := make([]rune, len(cipher));
+
+  for key[0] = 'a' ; key[0] <= 'z' ; key[0]++ {
+    for key[1] = 'a' ; key[1] <= 'z' ; key[1]++ {
+      for key[2] = 'a' ; key[2] <= 'z' ; key[2]++ {
+
+        for i := range cipher {
+          plain[i] = cipher[i] ^ key[i%3];
+        }
+
+        tmpDelta := indexProb( plain )
+
+        if tmpDelta < bestDelta {
+          bestKey = fmt.Sprintf("%c%c%c", key[0], key[1], key[2])
+          bestDelta = tmpDelta
+        }
+      }
+    }
+  }
+
+  for i := range cipher {
+    plain[i] = cipher[i] ^ rune(bestKey[i%3]);
+  }
+
+  answer := 0
+
+  for i := range plain {
+    fmt.Printf("%c", plain[i])
+    answer += int(plain[i])
+  }
+
+
+  fmt.Println("\nBest key :", bestKey);
+  fmt.Printf("Answer : %d\n", answer);
+}