What happens if one Shamir backup share is copied without my knowledge?

For a properly configured threshold scheme, fewer than the required number of shares should not reconstruct the secret; compromise can still matter operationally.

The answer

For a properly configured threshold scheme, fewer than the required number of shares should not reconstruct the secret; compromise can still matter operationally.

What to do next

Check the threshold, locations and whether enough shares could have been copied together.

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