There are plenty of encrypted messaging apps out there, of greater or lesser value. Ultimately, though, they all have a similar flaw. If you have one of these ultra-secure apps on your phone, or malicious authorities capture you sending lots of messages to such a server, it can be somewhat obvious that you’re doing something worth hiding. You might not be—you might just have a penchant for keeping your fantasy football submissions under wraps. Regardless, using heavily-encrypted messaging systems can put a bit of a beacon on you, at a time when you might be hoping to stay as unobtrusive as possible.
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Both page table entries and segment descriptors have an Accessed bit that the hardware must set on use -- but the mechanisms are quite different.