Q: How can you verify that a password is correct if you don't store it anywhere and don't send it to server? How do you authenticate the user?
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A: The server doesn't know anything about authentication; that's all handled in your browser. There are no users on ProtectedText.com, just sites. Passwords are never saved; not even within encrypted text.
Decryption of a page will fail if the password is incorrect, so whoever can decrypt the page must have used the correct password. The idea is that we don't have to know the password; we just have to make sure that the password is correct - and one way to check that is to try decrypting some well-known text using the provided password. The 'well-known' text we're using is the URL of the current site (which is different, but known, for each site).
Once a user creates the password, we store the encrypted URL, and each time the password needs to be tested, we just try decrypting the encrypted URL. Adam open source editor. If we get the expected URL, we try using the same password for decrypting the whole site (it's possible -- but very unlikely -- that two different passwords correctly decrypt the same URL, but using that wrong password for decrypting everything else will result in gibberish).
Decryption of a page will fail if the password is incorrect, so whoever can decrypt the page must have used the correct password. The idea is that we don't have to know the password; we just have to make sure that the password is correct - and one way to check that is to try decrypting some well-known text using the provided password. The 'well-known' text we're using is the URL of the current site (which is different, but known, for each site).
Once a user creates the password, we store the encrypted URL, and each time the password needs to be tested, we just try decrypting the encrypted URL. Adam open source editor. If we get the expected URL, we try using the same password for decrypting the whole site (it's possible -- but very unlikely -- that two different passwords correctly decrypt the same URL, but using that wrong password for decrypting everything else will result in gibberish).
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