PyCrypto AES encryption algorithm detailed
PyCrypto AES encryption algorithm detailed explanation
Overview
AES (Advanced Encryption Standard) is a symmetrical key and encryption algorithm that is widely used in the field of data security.It is one of the most commonly used encryption algorithms and has been adopted by many software and hardware systems.In this article, we will deeply explore how to use the PyCrypto library to implement the AES encryption algorithm and provide a complete programming code and related configuration.
First, we need to install the PyCrypto library.You can use the following command to install in the command line:
pip install pycrypto
2. Import the necessary module
In the Python code, we first need to import the necessary modules to implement the AES encryption algorithm.Here are the modules that need to be imported:
python
from Crypto.Cipher import AES
from Crypto.Random import get_random_bytes
-` `Crypto.Cipher` Module contains a class that implements multiple encryption algorithms. We will use the AES class to implement AES encryption.
-` `crypto.random` Module is used to generate random bytes as keys in the process of encryption.
3. Generate key
In AES encryption, we need a key to encrypt and decrypt data.The following is the code for generating random keys:
python
key = get_random_bytes(16)
The above code will generate a 16 -byte (128 -bit) random key.
4. Configuration initialization vector (IV)
Initialization vector (IV) is a technology used to increase the randomness of the password system and ensure security.In AES encryption, we need to configure a 16 -byte IV.The following is the code that generates random IV:
python
iv = get_random_bytes(16)
5. Encryption data
We can now encrypt the data with the generated key and IV.The following is the code of encryption data:
python
def encrypt_data(key, iv, data):
cipher = AES.new(key, AES.MODE_CBC, iv)
padding = AES.block_size - (len(data) % AES.block_size)
data += bytes([padding]) * padding
encrypted_data = cipher.encrypt(data)
return encrypted_data
encrypted_text = encrypt_data(key, iv, b"Hello, World!")
In the above code, we use key, IV, to encrypted data, and AES encryption mode (using the CBC mode) to create a AES object.We then fill in the data to ensure that its length meets the group size (usually 16 bytes) required by the AES encryption algorithm.Finally, we encrypt the data with the created AES object and return the encrypted data.
Note: In order to ensure the correct encryption and decryption process, the data before and decrypted the data need to have the same length and filling.
6. Decrypt the data
By using the same key, IV, and AES objects, you can decrypt the encrypted data.The following is the code for decryption data:
python
def decrypt_data(key, iv, encrypted_data):
cipher = AES.new(key, AES.MODE_CBC, iv)
decrypted_data = cipher.decrypt(encrypted_data)
padding = decrypted_data[-1]
decrypted_data = decrypted_data[:-padding]
return decrypted_data
decrypted_text = decrypt_data(key, iv, encrypted_text)
In the above code, we use the same key, IV, and AES objects to create a decryrator.Then, we decrypt the encrypted data and delete the filling byte to obtain the original data.
Note: In the process of decryption, make sure that the use and parameters are exactly the same as the encryption process.
Summarize
By using the PyCrypto library, we can easily implement the AES encryption algorithm.This article provides a detailed explanation of the PyCrypto AES encryption algorithm, and introduces the complete programming code and related configuration of generating key, configuration initialization vector, encryption data, and decryption data.By understanding and practicing these code, we can better understand and apply the AES encryption algorithm to improve the security of data.