![]() ![]() If you find it, you will know the corresponding password. When you know the hash value of a password, you only need to find the hash value in the table you created. Of course, the more passwords, the larger the table. It first calculates the hash value of some commonly used passwords, and then creates a table. ![]() The table lookup method does not guess passwords like dictionary cracking and brute force cracking. Now let's take a look at the principle of the table lookup method. There are also some methods, such as Reverse Lookup Tables, Rainbow Tables, etc., which are similar to the look-up table method. If you know the hash of the password in the database, you can use a more efficient way to crack the Lookup Tables. The two methods are white is to guess the password.ĭictionary cracking and brute force cracking are all relatively low-efficiency cracking methods. The simplest and most common way to crack is the Dictionary Attack and Bruce Force Attack. (2) Several common methods for cracking passwords So is it safe to store the password encrypted by the hash function? Let's take a look at several common ways to crack passwords. Since the hash function is irreversible, even if someone opens the database, you can't see what the user's password is. When the user logs in to the website, we can verify that the hash value entered by the user is the same as the hash value in the database. With the hash function, we can store the hash of the password into the database. In other words, from the hash value, you can't figure out how much the original password is. (4) The hash function is unidirectional and irreversible. (3) The same password, the hash value is the same (2) change the original password, the hash value calculated by the hash function will also change accordingly. (1) The original password is calculated by a hash function to obtain a hash value. ![]() Simply put, its characteristics are as follows: The specific definition of the hash function can be found online or in related books. The more common encryption method is to use a hash function. The solution is to encrypt the password and store it in the database. It is extremely insecure to write the password directly into the database as follows, because anyone who can open the database will be able to directly See these passwords. If you need to save a password (such as a website user's password), you should consider how to protect the password data. (1) Why use a hash function to encrypt passwords? Even if a hacker can find a user with a specific password with his own password and his own generated hash value, the chance is too small (the password and the salt value are the same as those used by the hacker). ![]() Thus, even if two users use the same password, their hash values are different because the system generates different salt values for them. The "feed" here is called the "Salt value", and this value is randomly generated by the system and is only known by the system. When the user logs in, the system sprinkles the same "feed" for the user-provided code, then hashes it, compares the hash value, and determines if the password is correct. The basic idea is this: When the user first provides the password (usually when registering), the system automatically sprinkles some "sorts" into the password and then hashes. The so-called addition of the Salt method is to add a "feeding". We know that if the password is hashed directly, the hacker can get the password of a user by obtaining the hash value of the password and then checking the hash value dictionary (for example, MD5 password cracking website).Īdding Salt can solve this problem to some extent. Use Salt + Hash to encrypt your password Novem09:43:44 wxwzy738 Reads: 20506 Turn: ![]()
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