Can you explain how hashing is insufficient? You're saying someone could use a lookup table of hashcodes for all the URLs on the internet and deanonymize the URLs? The browser's identity is still unrecoverable.
EDIT: Ah, just looked up k anonymity. We don't store any of the information that they're protecting for, like age, sex, any other personal attributes.
EDIT: Ah, just looked up k anonymity. We don't store any of the information that they're protecting for, like age, sex, any other personal attributes.