MySQL database and Go language: How to protect internal data decryption?

MySQL database and Go language: How to protect internal data decryption?

With the popularity of data storage in the cloud and network transmission, data security is receiving more and more attention. For the MySQL database, we can use encryption to protect the security of the data, but this also brings a problem: How to perform decryption operations within the data while ensuring the security of the data? In this article, we will explore how to solve this problem using Go language.

Implementation of encryption in MySQL database

MySQL database provides support for data encryption. We can use the AES algorithm to encrypt sensitive data and use the master key to protect the security of the AES key. When using a MySQL database, we can use the following operations to implement data encryption:

1. Create a MySQL master key

CREATE MASTER KEY ENCRYPTION BY PASSWORD '[password]';

2. Create an AES key

CREATE TABLE test_table (id INT, username VARCHAR(50), password VARBINARY(128), data VARBINARY(512));
CREATE KEY test_table_aes_key USING AES WITH KEY_LENGTH = 128;

3. Encrypt the data and store it in the database

INSERT INTO test_table (id, username, password, data) VALUES (1, 'johndoe', 
AES_ENCRYPT('secret', UNHEX(SHA2(CONCAT('[password]', '1234'), 256)))), 
AES_ENCRYPT('data', UNHEX(SHA2(CONCAT('[password]', '1234'), 256))));

The above steps will encrypt the data in the password and data fields while ensuring the security of the Master Key, thereby Protect the security of sensitive data.

Implementation of Go language

Now the problem we need to solve is how to decrypt data in Go language. First of all, we need to ensure the security of the Master Key, which means that the Master Key must be kept in a safe place and the data will not be stolen due to accidental leakage. This issue usually needs to be handled by the security team.

Now assume that we have safely obtained the encrypted data from the database, and the Master Key has also been safely saved. We can then use the AES algorithm in Go language to decrypt the data:

func decryptData(encryptedData, masterKey []byte) ([]byte, error) {
    block, err := aes.NewCipher(masterKey)
    if err != nil {
        return nil, err
    }

    decryptedData := make([]byte, len(encryptedData))
    iv := encryptedData[:aes.BlockSize]
    stream := cipher.NewCFBDecrypter(block, iv)

    stream.XORKeyStream(decryptedData[aes.BlockSize:], encryptedData[aes.BlockSize:])
    return decryptedData[aes.BlockSize:], nil
}

The above code will decrypt the data by passing in the encrypted data and Master Key. During the decryption process, we use the CFB mode to decrypt the data and use the XOR operation to change the value of the bits to improve the security of the encryption.

Conclusion

For MySQL database and Go language developers, protecting data security is a necessary task. Through the MySQL data encryption implementation and Go language decryption implementation provided in this article, we can effectively protect the security of data, thereby providing users with more secure and trustworthy services. At the same time, we also need to pay attention to the security of the Master Key to avoid data loss or theft due to accidental leakage.

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