[openplatypus]

Correct. This is a flawed hashing implementation as it allows for re-identification.

Having that IP and user timezone you can generate the same hash and trace back the user. This is hardly anonymous hashing.

Wide Angle Analytics adds daily, transient salt to each IP hash which is never logged thus generating a truly anonymous hash that prevents reidentification.

[thih9]

What if my hashing function is really destructive and has high likelihood of collisions?

[hk__2]

> What if my hashing function is really destructive and has high likelihood of collisions?

If it’s so destructive that it’s impossible to track users, it’s useless for you. If not, you need a privacy banner.

[thih9]

A high collision hash would be useful for me on my low traffic page and I’d enjoy not having to display a cookie banner.

Also: https://news.ycombinator.com/item?id=38096235