![]() #Xojo gmail password#If a hacker gets access to your hash value and they know how it was calculated, they can then look it up in the rainbow table to see what the plain text password is. Since most people choose relatively simple passwords, they will more than likely be found in a rainbow table. This is where a nefarious hacker pre-calculates hash values for large amounts of common words. This strategy is a great start, but it has a flaw: it is susceptible to a “brute-force” attack. If they are the same then you know the password is correct even though you do not know the actual password. To validate that the password is correct, when the user logs in you calculate the hash of the password they entered and then check to see if it matches the hash of the password you have stored. The idea is that instead of storing the actual password, you use the hash of the password. ![]() It just so happens that Xojo has several built-in one-way hash functions in the Crypto namespace: MD5, SHA1, SHA256, SHA512 and PBKDF2.įor example, given a password “frenchfries”, MD5 generates this hash value (converted to hex): A one-way hash is a hash that can convert text to a hash value but cannot convert the hash value back to the original text. A hash is a function that given a value, returns a new value of a fixed length that is always the same for the original value. Instead store a one-way hash of a password. So the first thing to do is to not store the password. ![]() The only one who should know the password is the person who created the password. Unfortunately, I’ve seen far too many apps that have databases with a “password” column that contains the actual password! And I’m sure you’ve seen web sites that, when you click the “forgot password” link, send you an email with your actual password! This is not good. ![]() The best way to not allow passwords to be compromised is to not store the password at all. Though too much security is never enough, as developers, there are things we can do to keep our users’ passwords secure. Passwords are a problem, as we frequently see in the news when databases containing password and login information are hacked and exposed. ![]()
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