https://www.chronicle.com/article/7-ways-to-assess-students-online-and-minimize-cheating

• Break up a big high-stakes exam into small weekly tests.
• Start and end each test with an honor statement.
• Ask students to explain their problem-solving process. 
• Get to know each student’s writing style in low- or no-stakes tasks.
• Assess learning in online discussion forums.
• Don’t base grades solely on tests. 
• Offer students choice in how they demonstrate their knowledge.

As we all work to improve our online teaching, we have the opportunity to rethink practices we’ve relied on for years in our physical classrooms.

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more on cheating in this IMS blog
https://blog.stcloudstate.edu/ims?s=cheating