Excellent introductory article. My only gripe is that the following statement should have been qualified: > Datensparsamkeit suggests that you shouldn't store

Excellent introductory article. My only gripe is that the following statement should have been qualified: > Datensparsamkeit suggests that you shouldn't store the IP address directly, perhaps instead you should hash it and only store the hash. Hashing an IP address with a well-known function such as SHA1 will be almost useless for keeping the data private from malicious actors, as there are less than 4 billion hashes to precompute. A keyed hash would be better assuming that the key could be well protected.