ONLINE GPU HASH CALCULATOR PASSWORDSome of the popular password strength metric services, such as “Password Meter” and “How Secure is my Password”, use a bit more complex custom-crafted rule sets for their password evaluations. It is noticeable that password length increase has a stronger effect on entropy then the increase in character set size. In general, password strength can be linked to the information content or entropy of the password, and both the length and the size of the character set size affect its value.Įntropy H is given as: H = L ∗ log 2 N, where L is password length and N is the character set size. ONLINE GPU HASH CALCULATOR CRACKEDStronger passwords take a longer time to be cracked with brute force attacks, as more combinations need to be checked before the correct one is found. It is interesting to define password strength in terms of a very common attack method, the brute force attack, which attempts to find passwords for every possible combination in a given character set. By using weaker passwords, they are often relieved of the burden of having to remember a larger number of passwords. The human aspect of this problem increases with the number of passwords people have to manage in their daily lives, as they use more and more password-based authorized applications. Although most people are aware of the importance of choosing strong passwords to protect their personal information, they often lack the necessary motivation to follow the suggested guidelines that could help them create stronger passwords. The widespread use of password-based systems emphasized one of the major drawbacks they bring – the security vulnerability that ordinary user-generated passwords contain, as they are easily affected by common password guessing attacks. Although various alternatives, such as graphic based authentications, have been proposed, the simplicity of text-based passwords make their replacement a slow and even unlikely process. We also demonstrate the scalability of our cCc cluster.Īs more and more aspects of our lives become closely intertwined with the use of various Internet-based applications, many of which have only emerged in recent years, password-based authentication is still the most popular method of gaining access to them. In terms of the total operational costs, our cluster pays off after 4500 cracked passwords for a bcrypt hash with cost parameter 12, which makes it more appealing for real-world password-based system attacks. We show that our solution outperforms other platforms such as high-end GPUs, by a factor of at least 3 in terms of energy-efficiency and thus producing less overall cost of password attack than other platforms. We also compared our cluster with various GPU implementations in terms of performance, energy-efficiency, and price-efficiency. We tested individual nodes and the cluster as a whole, trying different combinations of nodes and evaluating our distribution scheme for password candidates. the order of appearance in the dictionary. To mitigate the different performances among the cluster nodes and to balance the load, we developed and implemented password candidate distribution scheme based on the passwords' probability distribution, i.e. On the communication layer, we used Message Passing Interface (MPI)library with a standard Ethernet network connecting the nodes. ONLINE GPU HASH CALCULATOR SOFTWAREThe cluster was formed around the famous open-source password cracking software package John the Ripper (abbr. Zynq based nodes use the improved version of our custom bcrypt accelerator, which executes the most costly parts of the bcrypt hash computation in programmable logic. In the experiments, we used a combination of Xilinx Zynq-series SoC boards and ZTEX 1.15y board which was initially used as a bitcoin miner. In the cluster, nodes are low-power heterogeneous embedded systems with programmable logic containing specialized hash computation accelerators. The cluster consists of up to 8 computational units (nodes) with different performances measured in bcrypt hash computations per second. ONLINE GPU HASH CALCULATOR CRACKERIf (xhr.readyState = 4 & xhr.This paper presents the improved version of our cool Cracker cluster (cCc), a heterogeneous distributed system for parallel and energy-efficient bcrypt password hash computation. We have removed CORS restriction so you can use direct access to hash calculator in your javascript applications via AJAX. Output - for output type (empty, "json" or "plain") Via params to avoid processing of our url parser. If you have string that contains complicated urlencoded characters you can send it directly The another cool thing is that you can specify "json" or "plain" mode into URL and you will get only HASH in response. Type string that you need to encode with algorithm according to next schema:įor example to visit page that contains hash of "hello world" you can just visit url: You can use direct access to this page from your browser address bar.
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