http://loyaltylobby.com/2015/03/13/update-hilton-hhonors-dropping-pins-1000-points-for-updating-password-march-12-24-2015-new-dates/
Today, to ensure maximum security, Hilton announced that the login process for all Hilton HHonors members is being updated. PIN numbers will no longer be accepted and members will have until March 25, 2015, to create a new password or update their existing password. Members that update their password between February 19 and by March 8, 2015, will be awarded 1,000 Bonus Points as a thank you. Updating passwords today won’t make a difference as the change must happen on or after February 19, 2015.
This update will continue to protect the privacy of HHonors members while also allowing Hilton to make accounts more secure as the hospitality industry and loyalty programs are seeing an increased number of security incidents. While we know this is an added measure for our HHonors members, it will help us ensure their accounts are more secure.