security password

Do you can please send the source code?

I will send source code, mark my answer is accepted

Thanku on the answer. Do you can please write the code?

Use Md5 algorithm to stored password, keep 3 columns for last 3 password. When user changed password compare with these 3 if found then show error and don't allow to add. Keep last change password column in table if value is null then ask user to change password. User has to change password first time. Use regular expression of password. I will give you in next comment .. https://stackoverflow.com/questions/19605150/regex-for-password-must-contain-at-least-eight-characters-at-least-one-number-a