If the files are encrypted with a user-supplied password/passphrase/public key, and decrypted by the server on download, it would give a fairly good balance between security and convenience.

The attackers, if they get control of the server, could then only decrypt the files the users download by sniffing passphrases.

In reply to Re^4: Encrypt files on server and then decrypt when user downloads by Anonymous Monk
in thread Encrypt files on server and then decrypt when user downloads by MPM

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