How do I create an account?
To create an account on Cryptography Stack Exchange, please sign up through Google, Facebook, or create a new Stack Exchange account using an email address and password.
In addition to creating an account for this site (and its associated meta-discussion site), you will also have a Stack Exchange network profile, which is accessible from your user page on any site where you have an account. This means that if you create an account on any other Stack Exchange site, it will be linked to your account here. Once you’ve earned 200 reputation on at least one Stack Exchange site, you will receive a starting +100 reputation bonus to get you past basic new user restrictions. This will happen automatically on all current Stack Exchange sites where you have an account, and on any other Stack Exchange sites at the time you log in.