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Changes between Initial Version and Version 1 of Ticket #6111, comment 4

initial	v1
3	3	If a member has changed their password, then that indicates either a) they had forgotten their old password or b) their old password had been compromised. If it's the case of the latter and at a later date the member again changes their password (this time to the old compromised password perhaps forgetting it was compromised in the past) then that could pose a security threat.
4	4
5		If remembering old passwords is a trivial thing to do then I'd opt for that approach. ~~That said, I'm now thinking that might be overkill.~~
	5	If remembering old passwords is a trivial thing to do then I'd opt for that approach.