(1)加密(Encryption) 将明文变换为密文的过程。把可懂的语言变换成不可懂的语言。 (2)明文(Plaintext) 加密前的原始信息。 (3)解密(Decryption) 加密的逆过程,即由密文恢复出原明文的过程。把不可懂的语言变换成可懂的语言。 (4)密文(Ciphertext) 加密后的信息。 古典加密算法主要分为: 单表替代密码:Caesa...
We will use symmetric encryption, which means the same key we used to encrypt data is also usable for decryption. There are a lot of encryption algorithms out there. The library we gonna use is built on top of theAES algorithm. There are many encryption uses in the real world. In fact,...
对称加密（AES）：from cryptography.fernet import Fernet # 生成一个密钥 key = Fernet.generate_key...
encryption_algorithm=serialization.NoEncryption())# 将公钥序列化以便传输或存储pem_public_key=public_k...
Now that we have the function that is responsible for encryption, let's make the opposite, that's decryption:def decrypt_pdf(input_file: str, password: str): """ Decrypts a file using PyPDF4 library. Precondition: A file is already encrypted """ pdf_reader = PdfFileReader(open(input_...
# Measure how long the encryption/decryption takes: startTime = time.time() if myMode == 'encrypt': translated = transpositionEncrypt.encryptMessage(myKey, content) elif myMode == 'decrypt': translated = transpositionDecrypt.decryptMessage(myKey, content) ...
()fileObj.close()print('%sing...' % (myMode.title()))# Measure how long the encryption/decryption takes:startTime = time.time()if myMode == 'encrypt':translated = transpositionEncrypt.encryptMessage(myKey, content)elif myMode == 'decrypt':translated = transpositionDecrypt.decryptMessage(...
root.title("Encryption and Decryption") # 设置输入文本区域 text_input = tk.Text(root, height=8) text_input.pack() # 设置按钮 button1 = tk.Button(root, text="Encrypt", command=encrypt_message) button1.pack() button2 = tk.Button(root, text="Decrypt", command=decrypt_message) ...
System.out.println("AES Encryption Time (Average): " + avgEncryptTime + " nanoseconds"); System.out.println("AES Decryption Time (Average): " + avgDecryptTime + " nanoseconds"); } private static SecretKey generateKey() throws Exception { ...
4 of the key: M Z Q Possible letters for letter 5 of the key: O B Z Possible letters for letter 6 of the key: V I K Attempting with key: ASIMOV Possible encryption hack with key ASIMOV: ALAN MATHISON TURING WAS A BRITISH MATHEMATICIAN, LOGICIAN, CRYPTANALYST, AND COMPUTER SCIENTIST....