http://wrokmsb7w47rro6st7u6fdopaocqwnyqqzukosgqpusdxyp5sbbuzoad.onion/cypher/index.html
For more serious protection, use special operating systems that allow you to work on the site completely confidentially (Tails or Whonix, for example). Follow links only from trusted sources. Despite a fairly simple authentication system, you shouldn’t enter your personal data in any field (username, password).