You can prohibit re-use of passwords that were used immediately preceding a newly selected password.
In the Number of Previous Passwords that Cannot be Reused field, enter a numeric value greater than one to prohibit re-use of the current and preceding passwords. For example, if you enter a numeric value of 3, the new password cannot be the same as the current password or the two passwords used immediately before it.
You can also prohibit re-use of similar characters from passwords used previously. In the Maximum Number of Similar Characters from Previous Passwords that Cannot be Reused field, enter the number of consecutive characters from the previous password or passwords that cannot be repeated in the new password. For example, if you enter a value of 7, and the previous password was password1, then the new password cannot be password2 or password3.
If you enter a value of 0, then all characters must be different regardless of sequence. For example, if the previous password was abcd, then the new password cannot include the characters a, b, c, or d.
The rule can apply to one or more previous passwords. The number of previous passwords checked is the number specified in the Number of Previous Passwords that Cannot be Reused field.