Password strength evaluation method based on password reuse, character hopping and separation

A password strength evaluation method based on password reuse, character hopping and separation belongs to the technical field of information security, and comprises the following steps: selecting a password set matched with a scene, and constructing a character conversion dictionary and a password structure dictionary through a fuzzy matching algorithm; restoring the password input by the user into a basic character segment, and recording character conversion and a password structure; calculating a basic character segment construction probability by using a neural network, searching a dictionary for a character conversion and password structure corresponding probability, and performing probability continuous multiplication to obtain a password construction probability; and feeding back the absolute intensity and the relative intensity of the password and candidate passwords which are similar to but sufficiently safe to the user password to the user. User password reuse characteristicsare concluded into capit