Sharing files confidentially in 2023

Problem: A well-defined group of people formerly working at a single location used to pass along pieces of paper containing confidential information so group members could comment and expand. But after covid they find it hard to get together in one place and, since every member has a computer, they would like to be able to do it online. But confidentiality remains very important, along with integrity of the information. What can they do?

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