Noted "white hat" hacker Peiter Zatko is the new head of security at Twitter (NYSE: TWTR). Known to many by his hacker handle "Mudge," Zatko confirmed the appointment in a tweet on Monday. "I truly believe in the mission of (equitably) serving the public conversation," he wrote. "I will do my best!" Image source: Getty Images. One of the more high-profile "ethical" hackers on the scene, Zatko has had a long career in security work both in the private sector and in the government. He held positions as security chiefs for privately held fintech company Stripe and the Advanced Technology and Projects skunkworks at Alphabet's Google. In the public sphere, he was a program manager at the Defense Advanced Research Projects Agency (DARPA), conducting research activities and doling out grants for cybersecurity projects. He rose to prominence in the 1990s, when he was a top figure at a veteran hacking collective known as the Cult of the Dead Cow. This group gained notoriety for developing and distributing tools that allowed users to hack Microsoft's (NASDAQ: MSFT) Windows operating system, although the main aim was to pressure the company into improving its security regime. The Cult is also known for coining the term "hacktivism," describing positive hacking done for the benefit of society. Zatko's skills should get quite the workout at Twitter, which has struggled with security vulnerabilities. This past July, for example, a group of hackers accessed internal tools at the company. They then used them to change account settings and send fake tweets from prominent accounts such as those of Joe Biden, Tesla CEO Elon Musk, and Microsoft founder and ex-CEO Bill Gates. 10 stocks we like better than TwitterWhen investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* David and Tom just revealed what they believe are the ten best stocks for investors to buy right now... and Twitter wasn't one of them! That's right -- they think these 10 stocks are even better buys. See the 10 stocks *Stock Advisor returns as of October 20, 2020 Suzanne Frey, an executive at Alphabet, is a member of The Motley Fool’s board of directors. Teresa Kersten, an employee of LinkedIn, a Microsoft subsidiary, is a member of The Motley Fool’s board of directors. Eric Volkman has no position in any of the stocks mentioned. The Motley Fool owns shares of and recommends Alphabet (A shares), Alphabet (C shares), Microsoft, Tesla, and Twitter and recommends the following options: long January 2021 $85 calls on Microsoft and short January 2021 $115 calls on Microsoft. The Motley Fool has a disclosure policy.Source