college-rowing-team

college_rowing_team/encrypt.py

@@ -0,0 +1,29 @@
+#!python3
+
+import random
+from Crypto.Util.number import getPrime, bytes_to_long
+
+with open('flag.txt', 'rb') as f:
+    flag = f.read()
+
+msgs = [
+    b'I just cannot wait for rowing practice today!',
+    b'I hope we win that big rowing match next week!',
+    b'Rowing is such a fun sport!'
+        ]
+
+msgs.append(flag)
+msgs *= 3
+random.shuffle(msgs)
+
+for msg in msgs:
+    p = getPrime(1024)
+    q = getPrime(1024)
+    n = p * q
+    e = 3
+    m = bytes_to_long(msg)
+    c = pow(m, e, n)
+    with open('encrypted-messages.txt', 'a') as f:
+        f.write(f'n: {n}\n')
+        f.write(f'e: {e}\n')
+        f.write(f'c: {c}\n\n')