![]() Password length cannot be less than 8 characters. Selection of passwords that comply with a certain policyįor example, it is known that an organization has the following password requirements policy: the password must contain at least one capital letter at least one small letter at least one digit and at least one special character. First, we will learn how to create a dictionary of complex passwords from existing dictionaries. Let's start with an example from John the Ripper. It is highly recommended to read about this attack: Can you think of something? Yes, you can do the following: create a dictionary using the Mask that contains all possible words and, using the Rules, filter out only those that comply with the complex password policy. Hence, the problem arises: how to create a dictionary in which there will be only passwords, which, for example, have at least one number, one capital letter, one small letter and one special character? A rule-based attack is suitable for this.īut Rule Based Attack is not designed to generate new dictionaries (or password candidates) from scratch – it creates new words by changing existing ones using a set of rules. Although a mask attack allows for a fairly flexible configuration of password candidates, it will also not be very effective in brute-force attacks on passwords created according to security policy requirements. That is, using them means that almost all the brute-force time is wasted. As will be shown below, in typical dictionaries, about 99.65% of the password candidates do not comply with the strong password policy. Some services also check passwords invented by the user in a dictionary and make sure that they do not have many identical characters in a row, do not accept previously used passwords, etc.įor this reason, common dictionaries become ineffective for security auditing. As a rule, it must be a password of at least a certain length and containing various groups of characters (upper and lower case letters, numbers, special characters). Nowadays, many services, operating systems and websites have requirements for the complexity of the password that you want to use for your account. Dictionaries that contain all groups of characters ![]()
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