I have a few Aqara smart socket with power monitoring, and they ask great, but also expensive.

I had a bunch of the old style of IKEA smart sockets without power monitoring. They work just fine, but they are quite clunky…

I recently bought a couple of the new IKEA smart sockets with power monitoring, and they are almost on par with the Aqara ones, but less than half the price.

The short answer is basically everywhere they can find data.

But sometimes the government even wants to give them all the data they have on every citizen in their country, including medical history, financial information, and much much more. So the police can “Minority Report” terrorism before it happens

That’s not correct. Under the GDPR, the data that Facebook collects on you makes them the Data Controller. Any partners they share data with would be considered Data Processors. When you invoke your right to be forgotten under the GDPR, then both Data Controllers and Data Processors must delete your data. So if Facebook partners isn’t deleting your data after you filed a request to Facebook, then they are violating the GDPR.

That said Facebook is certainly violating the GDPR left and right. For example with their “Pay or Consent” model…

You are correct for regular hash functions, but a cryptographic hash function has stronger requirements.

MD5 was supposed be a cryptographic hash function, but it was found to be flawed all the way back in 1996, and has been discouraged ever since… Now it’s too weak to be used in a cryptographic setting, and too slow to be used in non-cryptographic settings.

This is why hashes like xxhash is considered a non-cryptographic hash function, while SHA-256 is considered a cryptographic hash function.