A bug exposed the checksum of annexed files to encrypted special remotes, which are not supposed to have access to the checksum of the un-encrypted file. This only occurred when resuming uploads to the encrypted special remote, so it is considered a low-severity security hole.
For details, see commit b890f3a53d936b5e40aa9acc5876cb98f18b9657
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No CVE was assigned for this issue.
Fixed in git-annex-6.20160419.