ADD file via upload

decrypt_ciphertext.py

@@ -0,0 +1,19 @@
+from cryptography.fernet import Fernet
+
+def load_key(key_file_path):
+    # 从文件中加载对称密钥
+    with open(key_file_path, 'rb') as key_file:
+        key = key_file.read()
+    return key
+
+def decrypt_file(encrypted_file_path, key):
+    with open(encrypted_file_path, 'rb') as encrypted_file:
+        ciphertext = encrypted_file.read()
+
+    cipher_suite = Fernet(key)
+    plaintext = cipher_suite.decrypt(ciphertext)
+
+    decrypted_file_path = encrypted_file_path.replace('.encrypted', '_decrypted.txt')
+    with open(decrypted_file_path, 'wb') as decrypted_file:
+        decrypted_file.write(plaintext)
+    print('解密成功:' + decrypted_file_path)