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AES Encryption and Decryption in PHP: AES-128-CBC

AES Encryption and Decryption in PHP

AES (Advanced Encryption Standard) is a popular encryption method used to protect sensitive information. It works with key sizes of 128, 192, and 256 bits. CBC (Cipher Block Chaining) is a mode often paired with AES, adding an Initialization Vector (IV) to boost security.

In this article, we’ll explore how to perform AES-128-CBC encryption and decryption in PHP.

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AES, also known as Rijndael, operates on blocks of data, with the block size being 128 bits. It supports key sizes of 128, 192, or 256 bits. In this example, we’ll focus on AES-128, which uses a 128-bit key.

AES encryption involves multiple rounds of transformations, including substitution, permutation, and mixing of the data. The core strength of AES lies in its ability to resist various cryptographic attacks.

CBC (Cipher Block Chaining) mode adds an extra layer of security to AES by chaining each block of plaintext to the previous cipher text block before encryption.

This method introduces an Initialization Vector (IV), which mixes with the first block of data before encryption. Following blocks mix with the previous cipher text block before encryption.

CBC mode prevents identical plaintext blocks from producing identical cipher text blocks, enhancing security against certain attacks like pattern analysis.

Now, let’s dive into the implementation of AES-128-CBC encryption and decryption in PHP. We’ll use the OpenSSL extension, which provides functions for cryptographic operations.

Step-1: Create a new PHP file “aes.php

Let’s start by writing a Class: AesCipher and two functions: aes_encrypt() and aes_decrypt(). These functions will handle encryption and decryption using AES-128-CBC mode.

Step-2: Usage Example

Now, let’s see how we can use these functions to encrypt and decrypt data.

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Conclusion

By understanding and implementing AES encryption in your PHP applications, you can safeguard sensitive data from unauthorised access and maintain confidentiality.

Thanks for reading 🙏, I hope you found the How to Display Default Variation Regular and Sale Price in WooCommerce tutorial helpful for your project. Keep learning! If you face any problems – I am here to solve your problems.

Also Read: How to generate dynamic QR code using PHP

FAQs

What is AES encryption?

AES (Advanced Encryption Standard) is a popular encryption method used to protect sensitive information.

Is AES encryption secure?

Yes, AES encryption is highly secure.

What is CBC mode in AES encryption?

CBC (Cipher Block Chaining) mode creates an extra layer of security to AES encryption.

How do I encrypt and decrypt data using AES in PHP?

You can use PHP’s OpenSSL extension to encrypt and decrypt data using AES. By using the right functions and keeping your keys safe, you can do this effectively.

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