galetahub/simple-captcha — pull request #32 by nakajijapan (2013-02-01 07:48:40+00:00)
Title: use session_id at SimpleCaptcha::Utils::generate_key()

It is wasteful not to use this code at default.
I want to change session[:id] into session[:session_id].
So, we can use session_id at default and simple_capthca_data.key become more unique.