Can I use WordPress Transients to store 'sensitive' data? For example login tokens or Captcha answers?
As far as I know all themes and plugins have access to transients. What would be another good way to store this kind of details?
Edit: The reason I ask this question is that I am creating a 2 Factor Authentication plugin that generates a login token. This token is sent via SMS or e-mail to the user. What would be a safe way to store this token.