The key should be as random as possible and it must not be a regular text string, nor the output of a hashing function, etc.

To save your key to your application/config/config.php, open the file and set:

$config['encryption_key'] = 'yourKeyHere'

Random Key Generator

It's important for you to know that the encoded messages the encryption function generates will be approximately 2.6 times longer than the original message. For example, if you encrypt the string "my super secret data", which is 21 characters in length, you'll end up with an encoded string that is roughly 55 characters (we say "roughly" because the encoded string length increments in 64 bit clusters, so it's not exactly linear). Keep this information in mind when selecting your data storage mechanism. Cookies, for example, can only hold 4K of information.

Encryption Class : CodeIgniter User Guide, To take maximum advantage of the encryption algorithm, your key should be 32 characters in length (128 bits). The key should be as random a string as you can​  The key should be as random as possible and it must not be a regular text string, nor the output of a hashing function, etc. To save your key to 

In addition to the answer by Chumillas, I personally use this Random Key Generator for my CodeIgniter encryption strings. Quick and easy.

how to use encryption library in codeigniter, Your encryption key must be as long as the encryption algorithm in use allows. For AES-256, that’s 256 bits or 32 bytes (characters) long. The key should be as random as possible, and it must not be a regular text string, nor the output of a hashing function, etc. To create a proper key, you can use the Encryption library’s createKey() method. This library has been DEPRECATED and is only kept for backwards compatibility​. Please use the new Encryption Library. Using the Encrypt Library. Setting your 

Codeigniter 3.1.0 YOU MUST NOT USE REGULAR TEXT FOR 'encryption_key'

"The key should be as random as possible and it must not be a regular text string, nor the output of a hashing function, etc. In order to create a proper key, you must use the Encryption library’s create_key() method"

$this->load->library('encryption');
$key = $this->encryption->create_key(16);
// Get a hex-encoded representation of the key:
$key = bin2hex($this->encryption->create_key(16));

// Put the same value in your config with hex2bin(),
// so that it is still passed as binary to the library:
$config['encryption_key'] = hex2bin(<your hex-encoded key>);

Source: https://codeigniter.com/userguide3/libraries/encryption.html#setting-your-encryption-key

codeigniter encryption library example, Your encryption key must be as long as the encryption algorithm in use allows. For AES-256, that’s 256 bits or 32 bytes (characters) long. The key should be as random as possible, and it must not be a regular text string, nor the output of a hashing function, etc. To create a proper key, you can use the Encryption library’s createKey() method. Configuring the library​​ For example, if you were to change the encryption algorithm and mode to AES-256 in CTR mode, this is what you should do: $this->encryption->initialize( array( 'cipher' => 'aes-256', 'mode' => 'ctr', 'key' => '<a 32-character random string>' ) );

Type this into your terminal:

php -r 'echo bin2hex(random_bytes(16)), "\n";'

It'll output a string where you update your config.php

codeigniter encrypt database password, The Encryption Service provides two-way symmetric (secret key) data encryption. The service will instantiate and/or initialize an encryption handler to suit your parameters as explained below. Encryption Service handlers must implement CodeIgniter’s simple EncrypterInterface. Using an appropriate PHP cryptographic extension or third-party DO NOT use this or any other encryption library for password storage! Passwords must be hashed instead, and you should do that through 

Just go to application/config

open config.php file

find out the word

$config['encryption_key'] = '';

replace this with

$config['encryption_key'] = 'your_encryption_key_here';

codeigniter encrypt url segment, The URI Class provides methods that help you retrieve information from your URI strings. If you use URI routing, you can also retrieve information about the re-routed segments. The optional second parameter defaults to NULL and allows you to set the return value of this method when the requested URI on some of the url it will work as expected but on some it will give browser error 404 (Object not found). On deleting the encrypted segment, I can 

I am using the following code in my app's installer. It takes 128 bytes of random data (converted to a hex string), and takes two characters at a time, converting to decimal, and checking they're in an acceptable range (alphanumeric, with symbols, no whitespace or characters that won't play nice with your editor or config file - aka no ')

32 characters is 128 bits, so it works well with the block cipher.

function random_key_string() {
    $source = bin2hex(openssl_random_pseudo_bytes(128));
    $string = '';
    $c = 0;
    while(strlen($string) < 32) { 
        $dec = gmp_strval(gmp_init(substr($source, $c*2, 2), 16),10);
        if($dec > 33 && $dec < 127 && $dec !== 39)
            $string.=chr($dec);
        $c++;
    }
    return $string;
}

codeigniter email encryption, Email Class¶. CodeIgniter’s robust Email Class supports the following features: Multiple Protocols: Mail, Sendmail, and SMTP; TLS and SSL Encryption for SMTP TLS and SSL Encryption for SMTP; Multiple recipients; CC and BCCs; HTML or Plaintext email; Attachments; Word wrapping; Priorities; BCC 

To save your key to your application/config/config.php, open the file and set:

on line 227 $config['encryption_key'] = "YOUR KEY";

codeigniter file encryption, The Encryption Service provides two-way symmetric (secret key) data encryption. The service will instantiate and/or initialize an encryption handler to suit your parameters as explained below. Encryption Service handlers must implement CodeIgniter’s simple EncrypterInterface. Using an appropriate PHP cryptographic extension or third-party DO NOT use this or any other encryption library for password storage! To save your key to your app/Config/Encryption.php, open the file and