changed repo structure

2025/cscg/crypto/intro1/exploit.py

@@ -0,0 +1,45 @@
+from pwn import *
+import binascii
+
+
+p = remote("a96a15c9c5222abacb014e80-1024-intro-crypto-1.challenge.cscg.live", 1337, ssl=True)# Define functions for convenience
+
+def recv_until(delim):
+    return p.recvuntil(delim)
+
+def interact():
+    p.interactive()
+
+def send_payload(payload):
+    p.sendline(payload)
+
+def xor(bytes1, bytes2):
+    return bytes([b1 ^ b2 for b1, b2 in zip(bytes1, bytes2)])
+
+
+# Example interaction
+recv_until(b":")
+payload = b"41" * 74
+send_payload(payload)
+
+encrypted_plaintext = []
+
+for _ in range(255):
+    data = binascii.unhexlify(recv_until(b"\n").replace(b"\n",b"").split(b" ")[-1])
+    encrypted_plaintext.append(data)
+
+payload = b"\x41" * 74
+
+print(payload)
+
+keystreams = [xor(enc, payload) for enc in encrypted_plaintext]
+
+enc_flag = binascii.unhexlify(recv_until(b"\n").replace(b"\n",b"").split(b" ")[-1])
+print(enc_flag)
+
+dec_flags = [xor(keystream, enc_flag) for keystream in keystreams]
+
+for flag in dec_flags:
+        if b'CSCG{' in flag:
+            print(flag)
+