Outflow Designs/ iStock / Getty Images Plus via Getty Images Follow ZDNET:  Add us as a preferred source  on Google. ZDNET's key takeaways Canvas was disrupted this week by a cyberattack. Many students are unable to access the popular educational portal. Instructure says data was stolen; what Canvas users should do next. Canvas is at the center of an ongoing cyberattack and data extortion attempt by a well-known cybercriminal group that claims to have stolen student records. If you are a Canvas user, you can take defensive measures now. Also: No one pays ransomware demands anymore - so attackers have a new goal What is Canvas? Canvas is a Learning Management System (LMS) from Instructure, a Salt Lake City-based educational technology company founded in 2008 . Designed for remote learning, Canvas has been adopted by thousands of schools for course creation and management, grading, feedback, and coursework submission.…