Aes Key And Iv Generator Download
Aes Key And Iv Generator 2020

Introduction and PHP/Java implementation of Infinite Garble Extension (IGE). AES encryption decryption online tool which performs encryption or decryption of an input data based on the given modes (ECB, CBC, CFB or OFB) and key bit sizes (128, 192 or 256 bits) using AES algorithm. The encryption/decryption with a cipher key of 128, 192, or 256 bits is denoted as AES-128, AES-192, AES-256 respectively. Key generator This page generates a wide range of encryption keys based on a pass phrase. Passphrase: aes-128-cbc: aes-128-cfb: aes-128-cfb1: aes-128-cfb8: aes-128-ecb: aes-128-ofb.

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Implementation for php 7.x was added

As you see this implementation is using openssl instead of mcrypt and the result of the encryption/decryption is not compatible with each other.
The mcrypt function will be deprecated feature in PHP 7.1.x

What is AES encryption?

It is a webtool to encrypt and decrypt text using AES encryption algorithm. You can chose 128, 192 or 256-bit long key size for encryption and decryption. The result of the process is downloadable in a text file.

How to use AES encryption?

If you want to encrypt a text put it in the white textarea above, set the key of the encryption then push the Encrypt button.
The result of the encryption will appear in base64 encoded to prevent character encoding problems.
If you want to decrypt a text be sure it is in base64 encoded and is encrypted with AES algorithm!
Put the encrypted text in the white textarea, set the key and push the Decrypt button.

When is helpful to use AES encryption?

When you want to encrypt a confidential text into a decryptable format, for example when you need to send sensitive data in e-mail.
The decryption of the encrypted text it is possible only if you know the right password.

What is AES encryption?

AES (acronym of Advanced Encryption Standard) is a symmetric encryption algorithm.
The algorithm was developed by two Belgian cryptographer Joan Daemen and Vincent Rijmen.
AES was designed to be efficient in both hardware and software, and supports a block length of 128 bits and key lengths of 128, 192, and 256 bits.

How secure is AES encryption algorithm?

AES encryption is used by U.S. for securing sensitive but unclassified material, so we can say it is enough secure.

1. Overview

The symmetric-key block cipher plays an important role in data encryption. It means that the same key is used for both encryption and decryption. The Advanced Encryption Standard (AES) is a widely used symmetric-key encryption algorithm.

In this tutorial, we’ll see how to implement AES encryption and decryption using the Java Cryptography Architecture (JCA) within the JDK.

2. AES Algorithm

The AES algorithm is an iterative, symmetric-key block cipher that supports cryptographic keys (secret keys) of 128, 192, and 256 bits to encrypt and decrypt data in blocks of 128 bits. The below figure shows the high-level AES algorithm:

If the data to be encrypted does not meet the block size of 128 bits requirement, it must be padded. Padding is a process of filling up the last block to 128 bits.

3. AES Variations

The AES algorithm has six modes of operation:

ECB (Electronic Code Book)
CBC (Cipher Block Chaining)
CFB (Cipher FeedBack)
OFB (Output FeedBack)
CTR (Counter)
GCM (Galois/Counter Mode)

The mode of operation may be applied in order to strengthen the effect of the encryption algorithm. Moreover, the mode of operation may convert the block cipher into a stream cipher. Each mode has its strength and weakness. Let’s have a quick review.

3.1. ECB

This mode of operation is the simplest of all. The plaintext is divided into blocks with a size of 128 bits. Then each block will be encrypted with the same key and algorithm. Therefore, it produces the same result for the same block. This is the main weakness of this mode and it is not recommended for encryption. It requires padding data.

3.2. CBC

In order to overcome the ECB weakness, CBC mode uses an Initialization Vector (IV) to augment the encryption. First, CBC uses the plaintext block xor with the IV. Then it encrypts the result to the ciphertext block. In the next block, it uses the encryption result to xor with the plaintext block until the last block.

In this mode, encryption can not be parallelized, but decryption can be parallelized. It also requires padding data.

3.3. CFB

This mode can be used as a stream cipher. First, it encrypts the IV, then it will xor with the plaintext block to get ciphertext. Then CFB encrypts the encryption result to xor the plaintext. It needs an IV.

In this mode, decryption can be parallelized but encryption can not be parallelized.

3.4. OFB

This mode can be used as a stream cipher. First, it encrypts the IV. Then it uses the encryption results to xor the plaintext to get ciphertext.

It doesn’t require padding data and will not be affected by the noisy block.

3.5. CTR

This mode uses the value of a counter as an IV. It's very similar to OFB, but it uses the counter to be encrypted every time instead of the IV.

This mode has two strengths, including encryption/decryption parallelization, and noise in one block does not affect other blocks.

3.6. GCM

This mode is an extension of the CTR mode. The GCM has received significant attention and is recommended by NIST. The GCM model outputs ciphertext and an authentication tag. The main advantage of this mode, compared to other operation modes of the algorithm, is its efficiency.

In this tutorial, we'll use the AES/CBC/PKCS5Padding algorithm because it is widely used in many projects.

3.7. Size of Data After Encryption

As mentioned earlier, the AES has a block size of 128 bits or 16 bytes. The AES does not change the size, and the ciphertext size is equal to the cleartext size. Also, in ECB and CBC modes, we should use a padding algorithm likes PKCS 5. So, the size of data after encryption is:

For storing IV with ciphertext, we need to add 16 more bytes.

4. AES Parameters

In the AES algorithm, we need three parameters: input data, secret key, and IV. IV is not used in ECB mode.

4.1. Input Data

The input data to the AES can be string, file, object, and password-based.

4.2. Secret Key

There are two ways for generating a secret key in the AES: generating from a random number or deriving from a given password.

In the first approach, the secret key should be generated from a Cryptographically Secure (Pseudo-)Random Number Generator like the SecureRandom class.

For generating a secret key, we can use the KeyGenerator class. Let’s define a method for generating the AES key with the size of n (128, 192, and 256) bits:

In the second approach, the AES secret key can be derived from a given password using a password-based key derivation function like PBKDF2. We also need a salt value for turning a password into a secret key. The salt is also a random value.

We can use the SecretKeyFactory class with the PBKDF2WithHmacSHA256 algorithm for generating a key from a given password.

Let’s define a method for generating the AES key from a given password with 65,536 iterations and a key length of 256 bits:

4.3. Initialization Vector (IV)

IV is a pseudo-random value and has the same size as the block that is encrypted. We can use the SecureRandom class to generate a random IV.

Let’s define a method for generating an IV:

5. Encryption and Decryption

5.1. String

To implement input string encryption, we first need to generate the secret key and IV according to the previous section. As the next step, we create an instance from the Cipher class by using the getInstance() method.

Additionally, we configure a cipher instance using the init() method with a secret key, IV, and encryption mode. Finally, we encrypt the input string by invoking the doFinal() method. This method gets bytes of input and returns ciphertext in bytes:

For decrypting an input string, we can initialize our cipher using the DECRYPT_MODE to decrypt th

Aes Key And Iv Generator