interencdec

interencdec/enc_flag

@@ -0,0 +1 @@
+YidkM0JxZGtwQlRYdHFhR3g2YUhsZmF6TnFlVGwzWVROclgyeG9OakJzTURCcGZRPT0nCg==

interencdec/sol.py

@@ -0,0 +1,23 @@
+#!/home/maxime/.pyvenv/bin/python3
+from base64 import b64decode
+
+def rot(n, s):
+    a = ord('a')
+    A = ord('A')
+    z = ord('z')
+    Z = ord('Z')
+    S = ''
+    for char in s:
+        ochar = ord(char)
+        if a <= ochar and ochar <= z:
+            char = chr(((ochar - a + n) % 26) + a)
+        elif A <= ochar and ochar <= Z:
+            char = chr(((ochar - A + n) % 26) + A)
+        S += char
+    return S
+
+with open("enc_flag", 'r') as f:
+    enc_flag = f.read()
+    dec1 = rot(19, b64decode(b64decode(enc_flag).strip().decode().replace('\'', '')[1:]).decode())
+    print(dec1)
+