Privacy
Privacy
How this site handles the small amount of data needed for the homepage like counter.
No tracking or advertising
This site uses no analytics, advertising, or cross-site profiling. It does not use the like counter to identify visitors or associate a like with a real-world identity.
Homepage likes
If the like service is enabled, the browser creates a random identifier and stores it locally underqi-zhang-homepage-like-visitor-id. The server applies HMAC-SHA-256 before storing that identifier. It also uses an HMAC of the network address only to enforce short-term abuse limits; raw IP addresses and user-agent strings are not stored.
Removing a like deletes its stored like record. Clearing browser local storage removes this browser’s local recognition of its previous like, but does not by itself remove an existing server record because the identifier needed to find that record has been erased.
Contact
Questions about this page may be sent tozhi-bai-shou-hei@sjtu.edu.cn.