Initial release

Les Avengers cryptanalystes I.py

@@ -0,0 +1,65 @@
+input = "CJKDPQZZZLSULOEXFPNMXOSVLJSVRHRMFFOABIKBZFJM"
+proxima = "PROXIMA"
+
+def vigenere(key, message):
+    message = message.upper().replace(" ", "")
+    key = key.upper()*(len(message)//len(key)+1)
+
+    plain = ""
+    for i in range(len(message)):
+        plain = plain + chr(ord('A') + (ord(message[i]) + ord(key[i])) % 26)
+    return plain
+
+def vigenere_1(key, message):
+    message = message.upper().replace(" ", "")
+    key = key.upper()*(len(message)//len(key)+1)
+
+    plain = ""
+    for i in range(len(message)):
+        plain = plain + chr(ord('A') + (ord(message[i]) - ord(key[i])) % 26)
+    return plain
+
+print("*", vigenere("FUA", 'PRO'))
+print("*", vigenere("XGA", 'PRO'))
+
+keys = list()
+for i in range(26):
+    for j in range(26):
+        key = chr(i+ord('A')) + chr(j+ord('A'))
+        res = vigenere(key, proxima[:len(key)])
+        if input.find(res) == -1:
+            continue
+        for k in range(26):
+            key = chr(i+ord('A')) + chr(j+ord('A')) + chr(k+ord('A'))
+            res = vigenere(key, proxima[:len(key)])
+            if input.find(res) == -1:
+                continue
+            for l in range(26):
+                key = chr(i+ord('A')) + chr(j+ord('A')) + chr(k+ord('A')) + chr(l+ord('A'))
+                res = vigenere(key, proxima[:len(key)])
+                if input.find(res) == -1:
+                    continue
+                for m in range(26):
+                    key = chr(i+ord('A')) + chr(j+ord('A')) + chr(k+ord('A')) + chr(l+ord('A')) + chr(m+ord('A'))
+                    res = vigenere(key, proxima[:len(key)])
+                    if input.find(res) == -1:
+                        continue
+                    for n in range(26):
+                        key = chr(i+ord('A')) + chr(j+ord('A')) + chr(k+ord('A')) + chr(l+ord('A')) + chr(m+ord('A')) + chr(n+ord('A'))
+                        res = vigenere(key, proxima[:len(key)])
+                        if input.find(res) == -1:
+                            continue
+                        for o in range(26):
+                            key = chr(i+ord('A')) + chr(j+ord('A')) + chr(k+ord('A')) + chr(l+ord('A')) + chr(m+ord('A')) + chr(n+ord('A')) + chr(o+ord('A'))
+                            res = vigenere(key, proxima[:len(key)])
+                            if input.find(res) == -1:
+                                continue
+                            keys.append(key)
+
+for key in keys:
+    res = vigenere_1(key, input[input.find(vigenere(key, proxima)):])
+    print(key, res)
+
+print("")
+print(vigenere_1("LOKI", input))
+