---

decrypt.py

@@ -0,0 +1,35 @@
+#!/usr/bin/python
+import sys
+
+
+def decrypt(text: str, d: int, n: int) -> str:
+  try:
+    # Convert the encrypted string into an integer
+    cyphertext_int = int(text)
+
+    # Calculate the plaintext m (in integer form) according to the formula c^d = (m^e)^d = m, where c is the cyphertext (in integer form)
+    plaintext_int = pow(cyphertext_int, d, n)
+
+    # Convert m from integer form back to the original string
+    plaintext_bytes = plaintext_int.to_bytes((n.bit_length() + 7) // 8, 'big')
+    plaintext = plaintext_bytes.strip(b'\x00').decode('utf-8')
+    return plaintext
+  except:
+    return 'Decryption Error!'
+
+
+def main():
+  if len(sys.argv) != 4:
+    print('Usage: ./decrypt.py text d n')
+    sys.exit(1)
+
+  cyphertext = sys.argv[1]
+  d = int(sys.argv[2])
+  n = int(sys.argv[3])
+
+  decrypted_text = decrypt(cyphertext, d, n)
+  print(f'Decrypted Text: {decrypted_text}')
+
+
+if __name__ == '__main__':
+  main()