Whether you want to open the link or not, your messaging app will load the web page in the background, including any malicious content or code it might contain. In this case, the sender's message contains only the link, and the app on the message recipient's device has to generate the link preview by opening the link before the recipient even clicks on it. Least safe: Receiver creates the link preview Messaging apps that do this include Apple iMessage, Viber and WhatsApp, plus Signal if link previews are enabled. "This approach assumes that whoever is sending the link must trust it, since it'll be the sender's app that will have to open the link," Bakry and Mysk wrote. So if your buddy Frances uses iMessage to send you a link to a page on, iMessage on her iPhone will package a small preview of the Tom's Guide page and bundle it into the link message. In the first and safest method, the message sender's app creates the link preview and sends it along with the link itself. That seems simple, but there are in fact three different ways to get that preview to show up in your chat or messaging app. We'll be keeping an eye on this report to see if some of them emerge as among those with the worst problems. Not examined, or at least not named, were several other prominent messaging and chat apps, including Kik, Microsoft Teams, Skype, Snapchat, Telegram, Wickr Me and Wire. The same chart in the actual research report did not include Reddit. Reddit was not named in the research report but was included in a chart of examined apps posted in Ars Technica (opens in new tab) and noted as having had its problems fixed. Besides the four named already, the other 12 were Discord, Google Hangouts, iMessage, Slack, Signal, Threema, TikTok, Twitter, Viber, WeChat, WhatsApp and Zoom. Line created the worst privacy risks among the listed apps, but several parts of the report were blacked out because they involved apps whose problems were more severe and had not been fixed. While Facebook Messenger, Instagram and LinkedIn were singled out for risky practices, those risks affected those companies' servers rather than end users. Who's good, who's worse and who's so bad they're not named "We think link previews are a good case study of how a simple feature can have privacy and security risks," the researchers wrote.
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