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New Encryption Key format introduced on Magento 2.4.7
December 02, 2024
20

Starting from Magento 2.4.7, the encryption key has a new format and the key length is increased to 256-bit. We will demonstrate the key generation process and after reading this blog, you should be able to generate one manually.
< 2.4.7 old format
The encryption key is in hex format, and actually, it is calculated by the PHP builtin md5() function.
<?php
// this is how Magento generates the key
echo md5(random_bytes(32)); // 128-bit
Example output:
5f81fe506a1025b8ea439fd49c6fa8e3
Alternative PHP way:
<?php
// this is how Magento generates the key
echo bin2hex(random_bytes(16));
The OpenSSL way:
openssl rand -hex 16
>= 2.4.7 new format
The encryption key is base64 encoded and prefixed with 'base64'.
<?php
// this is how Magento generates the key
echo 'base64' . base64_encode(random_bytes(32)); // 256-bit
Example output:
base64bDr+HSz4tZ+cjZA89J5RvbZzCfDKWO1iXgDfmqeZL0c=
The OpenSSL way:
( echo -n 'base64'; openssl rand -base64 32; ) | cat