iMessage apps offer more layers of encryption, but do you need one?

iMessage extensions let you pair additional security with the convenience of an existing network and contacts—but be wary of and stingy with early adoption.

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Glenn Fleishman’s most recent books include Take Control of Zoom, Second Edition, Take Control of Your M-Series Mac, and Take Control of Securing Your Mac. In his spare time, he makes Tiny Type Museums. He’s a senior contributor to Macworld, where he writes Mac 911.