Elon Musk once championed encrypted messaging app Signal, promoting its user privacy protections. Signal has been sharply criticized recently by a conservative activist and a rival app, Telegram. AdvertisementThe encryption wars brewing between the messaging apps Telegram and Signal have attracted the commentary of a high-profile critic: Elon Musk. In response to Rufo's post, Musk wrote cryptically, "There are known vulnerabilities with Signal that are not being addressed. Green, as well as Musk, Signal, and Telegram representatives, did not immediately respond to requests for comment from Business Insider.

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Persons: Elon Musk, Musk, —, Elon, Pavel Durov, Durov, Tucker Carlson, Vladimir Putin, Jeff Bezos, Christopher Rufo —, Katherine Maher, Rufo, Maher, Edward Snowden, Meredith Whittaker, Whittaker, haven’t, IbXREWVaPL — Meredith Whittaker, @mer__edith, Jack Dorsey, — Elon, Johns Hopkins, Matthew Green, Green Organizations: Service, Fox News, NSA, Amazon, Elon, Telegram, Business Locations: Moscow