ALL the CTFS of Crypto2025 finally

crypto-asimmetric/RSA-7/chall.py

@@ -0,0 +1,16 @@
+from Crypto.Util.number import bytes_to_long, getPrime, inverse
+from secret import flag
+
+p, q = getPrime(512), getPrime(512)
+n = p*q
+e = 65537
+print(n)
+m = bytes_to_long(flag.encode())
+print(pow(m, e, n))
+phi = (p-1)*(q-1)
+d = inverse(e, phi)
+
+while True:
+    req = input()
+    dec = pow(int(req), d, n)
+    print(dec % 2)