Just Learn Code

Securing Your JavaScript Data: A Guide to AES Encryption with CryptoJS and NcryptJs

In the world of web development, security is a top priority. One area that must be secured is the transfer of sensitive data such as passwords, credit card information, and other private data.

JavaScript developers can use cryptographic algorithms to encrypt and decrypt this sensitive information. In this article, we will introduce

CryptoJS and

NcryptJs libraries, explain the AES algorithm, and provide practical examples to encrypt and decrypt a JavaScript string.

CryptoJS

CryptoJS is a JavaScript library that provides cryptographic algorithms including AES, SHA-1, SHA-256, and HMAC. It is an excellent library for encrypting and decrypting sensitive data in web applications.

One of the advantages of using

CryptoJS is the easy implementation of algorithms without any installation or setup.

AES Algorithm

AES (Advanced Encryption Standard) is a widely used algorithm for data encryption. AES uses a cipher block encryption mechanism that encrypts data in blocks of 128 bits.

The key sizes for AES are 128, 192, and 256 bits. A secret key is required to perform encryption and decryption.

AES is commonly used in web applications to protect sensitive data. To use AES in

CryptoJS, we need to follow these steps:

1.

Create a secret key for encryption and decryption. 2.

Create a plain text to encrypt. 3.

Create an initialization vector (IV) for encryption. 4.

Use the secret key, plain text, and IV to perform the encryption and decryption process.

Using CryptoJs to Encrypt and Decrypt a JavaScript String

Here’s a practical example of how to use CryptoJs to encrypt and decrypt a JavaScript string. First, we need to add the

CryptoJS library to our project.

We can add it using a CDN or by downloading the library and linking it to our HTML file:

Next, we can create a secret key using

CryptoJS:

const secretKey =

CryptoJS.enc.Hex.parse(“000102030405060708090a0b0c0d0e0f”);

In this example, we used a 128-bit key. The secret key should be secret and never shared publicly.

Next, we can create the plain text to encrypt:

const plainText = “This is a plain text”;

We also need an initialization vector, which is an IV used for encryption:

const iv =

CryptoJS.lib.WordArray.random(16);

Now that we have the secret key, plain text, and IV, we can perform the encryption:

const encrypted =

CryptoJS.AES.encrypt(plainText, secretKey,

{ iv: iv }).toString();

The result of the encryption is a string that contains both the ciphertext and the IV. To decrypt the encrypted string, we can use the following code:

const decrypted =

CryptoJS.AES.decrypt(encrypted, secretKey,

{ iv: iv }).toString(

CryptoJS.enc.Utf8);

The result of the decryption is the plain text in a readable format.

NcryptJs

NcryptJs is another JavaScript library that provides encryption and decryption functionality. It also supports the AES algorithm with CBC (Cipher-Block-Chaining) mode.

Implementing AES-256-CBC Algorithm

To implement the AES-256-CBC algorithm with

NcryptJs, we need to follow these steps:

1. Create a secret key in a byte array format.

2. Create an IV in a byte array format.

3. Convert the plain text into a byte array format.

4. Use the secret key, IV, and plain text to perform the encryption process.

5. Decrypt the encrypted string back into the original plain text.

Here’s how we can use

NcryptJs to encrypt and decrypt a JavaScript string:

First, we need to add the

NcryptJs library to our project:

Next, we can create the secret key and IV in byte array format:

const secretKey = Ncrypt.hexStringToByteArray(“000102030405060708090a0b0c0d0e0f1011121314151617”);

const iv = Ncrypt.hexStringToByteArray(“000102030405060708090a0b0c0d0e0f”);

In this example, we used a 256-bit key. Next, we can convert the plain text into a byte array format:

const plainText = “This is a plain text”;

const bytes = Ncrypt.stringToByteArray(plainText);

Now we can perform the encryption process using the secret key, IV, and plain text:

const encrypted = Ncrypt.AES.encrypt(

bytes, secretKey, iv,

{ mode: Ncrypt.AES.CBC, padding: Ncrypt.pad.Pkcs7 }

);

The result of the encryption is a byte array that contains both the ciphertext and the IV.

To decrypt the encrypted byte array, we can use the following code:

const decrypted = Ncrypt.AES.decrypt(

encrypted, secretKey, iv,

{ mode: Ncrypt.AES.CBC, padding: Ncrypt.pad.Pkcs7 }

);

The result of the decryption is a byte array that contains the original plain text.

Conclusion

In a nutshell, encrypting and decrypting sensitive data is a crucial aspect of web application security. Cryptographic algorithms like AES can secure data by preventing unauthorized access.

JavaScript developers can use libraries like

CryptoJS and

NcryptJs to implement encryption and decryption processes in their web applications. To use these libraries, developers must follow specific steps to generate secret keys, IV, plain text and perform encryption or decryption.

We hope this article provided an informative introduction to the

CryptoJS and

NcryptJs libraries. In conclusion, the use of cryptographic algorithms like AES is vital for securing sensitive data in web applications.

The

CryptoJS and

NcryptJs libraries provide an easy-to-use solution for encrypting and decrypting JavaScript strings. The AES algorithm, with its various key sizes and modes, is commonly used for data encryption.

Both libraries offer practical examples to implement encryption and decryption processes, and the steps are relatively straightforward. Web developers must take security seriously and apply encryption techniques to protect users’ sensitive information.

By incorporating libraries like

CryptoJS and NcryptJS, developers can efficiently secure their web applications and safeguard users’ data from unauthorized access.

Popular Posts