The short answer is YOU (and only you). Per Harvard's Information Security Policy you may not share your password or access credentials with anyone. HUIT or any IT service at Harvard cannot reset your password for you. The HarvardKey system is totally self-service - so that you are in control of all aspects of your own access.
The HUID/password (formerly known as PIN) login type no longer meets current Harvard IT security standards and will be retired over the fall of 2016. HUID/password users who have not yet claimed a HarvardKey are encouraged to do so as soon as possible, and will also be reminded by email in advance of their HUID/password credential expiring.
You can always claim your HarvardKey, even after your HUID/password (formerly known as PIN) credential expires. However, once your HUID/password credential expires, you will no longer be able to access many of your Harvard services until you claim your HarvardKey.
Many online resources within the Harvard Community require verification of your identity before granting you access. By supplying a login name and matching password, you can verify, or authenticate, your identity. In order to reduce the number of credentials that you need to remember, HarvardKey acts as a unifying credential verifying your identity across Harvard without the need for multiple ID/password pairs.
HarvardKey is Harvard University’s unified credential for accessing a wealth of University applications and services with a single, convenient login name and password. In addition to enabling access to the Harvard applications and services you use every day, HarvardKey also offers an easy-to-use self-service portal for managing your account, including changing your password and updating your recovery information in case you forget your login details. HarvardKey also provides optional two-step verification to keep you even more secure.
Over the autumn and winter of 2015-16, full HarvardKey functionality will be rolled out to users across the University Community. Visit the HarvardKey news page to see the latest updates to the rollout schedule.