Private messaging application Signal hit the top of both Apple and Google app stores after being installed 1.3 million times on Monday. The number of downloads was recorded by Apptopia, which tracks apps. The number was a new record for the app. Signal utilizes end-to-end encryption to keep conversations secure, according to the website of the nonprofit Signal Foundation, the app’s developer. “We can’t read your messages or listen to your calls, and no one else can either. Privacy isn’t an optional mode—it’s just the way that Signal works. Every message, every call, every time,” it says. High-profile users include Edward Snowden, the National Security Agency whistleblower, and business maven Elon Musk. Another messaging app, Telegram, shot to number two in both major app stores. “These types of shifts in messaging and social networking apps are not unusual,” Amir Ghodrati, director of market insights at App Annie, which analyzes apps, …