Privacy and data minimisation¶
Short definition¶
Reduce information about you that can be observed, retained or linked.
Concrete example¶
Your message stays secret, but the service knows your number and last connection.
What it protects¶
Reduces content or contextual data depending on architecture and settings.
What it does not protect¶
Does not automatically mean anonymity or absence of all metadata.
Why it matters¶
Information useful to an investigation is not limited to messages.
Technical details
Distinguish necessary access, claimed retention, observed retention and actually documented disclosure.