An Algorithm to Generate Password Structure Dictionary Based on Gene Bank

Identity authentication is the first line of defense to ensure the security of information systems, and passwords are the most widely used authentication method. Choosing a valid password structure is an effective way to prevent password attacks, such as password dictionary attack. This article talked 68386069 real plaintext passwords with statistical their various features, summarized several rules for generating highly utilized passwords in certain styles. Based on these statistical features and rules, it generated high-probability password structure gene banks. With them, it formulates a dictionary to generate the candidate passwords. Thereby, this can enhance the efficiency of password recovery. We conducted extensive experiments by the real password test data, and the experimental results, compared with the dictionary provided by major websites, show that the dictionary of high probability password structure hit rate increased by about 30%. At the same time, this dictionary can save about one-third of the running time.