Grab your coffee and read up on today's top information security stories and articles from around the web:
- Let’s Encrypt takes free “wildcard” certificates live - Ars Technica
- In 2017, Google removed 3.2B ‘bad ads’ and blocked 320K publishers, 90K sites, 700K mobile apps - TechCrunch
- Patch Tuesday drops the mandatory antivirus requirement after all - Ars Technica
- Hacking group threatens researchers' lives after they discover attack servers - CyberScoop
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