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Your Signal messages can leak via locked screen on macOS

If you are a security-aware person, you probably use one of the secure messengers. 😏 And maybe to improve your comfort, you installed its desktop version on your mac? Sometimes we leave our computer unattended when we go to make a coffee, or we need to talk with somebody in the other room. Since we are security-aware, we always lock our screens (you do that, right?). But what if all messages sent to you will be visible on your locked mac?

Your encrypted photos revealed in macOS cache

Quicklook is a super cool mechanism allowing you to quickly check file contents without opening it in a specialized application. When you press the space bar on, for instance, *xlsx file, you can see the following preview without having MS Excel installed. While reading *OS Internals Volume I (that I highly recommend btw) I stopped on the Quicklook chapter. I found out that Quicklook registers com.apple.quicklook.ThumbnailsAgent XPC service that is responsible for ==creating thumbnails== database and storing it in /var/folders/…/C/com.