I want to encrypt certain field values from webform submissions and will use webform_encrypt module to achieve this. This is dependant on encrypt module.
I am interested to know how satisfactory are the default encryption methods which are included with Encrypt module?
For encryption method settings, I am using the default settings as below
Mcrypt AES (CBC Mode) Uses PHP's Mcrypt extension and AES in CBC mode. The key MUST be 16, 24, or 32 bytes.
I am also using the Base64 decode method with the key stored in a file outside the web root.
The generated key looks like this (I have changed most of the characters)
I don't know much about this stuff and I am unsure how strong this key is? It has 24 characters. Is it therefore a 24bit key?
Are any simple methods available to use a much longer key?