Merge pull request #109 from jatinluthra14/sbyte_xor

Single Byte Xor Bruteforcer

Author: ionicc

Cryptography/single_byte_xor.py

@@ -0,0 +1,26 @@
+import sys
+
+def score(text):
+    charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789,.'\n"
+    s = 0
+    for i in text:
+        if i in charset or i == ' ' or i == '\'':
+            s+=1
+    return s
+
+def xor(s1, s2):
+    res = ""
+    for i in range(0, len(s1)):
+        res += chr(ord(s1[i]) ^ ord(s2[i%len(s2)]))
+    return res
+
+def main():
+    best = ""
+    b = 0
+    for i in range(1, 256):
+        c = xor(sys.argv[1].decode('hex'), chr(i))
+        print(c,i)
+        if score(c) > b:
+            b = score(c)
+            best = c
+    print("Plaintext: {}".format(best))