TW
About AES-GCM, see Black Hat 2016, paper is public on iacr: "nonce disrespecting adversaries" https://twitter.com/tqbf/status/760907360319660032
http://www.nongnu.org/lzip/xz_inadequate.html interesting article, includes "longer is not necessarily better" fact about CRCs/hashes.
The AMD Ryzen 1800X cpu has this cpu flag: sha_ni : SHA1/SHA256 Instruction Extensions
keccak can be used for single-pass authenticated encryption.
http://preshing.com/20110504/hash-collision-probabilities/
Update: bountysource borgbackup organisation funds currently at USD 0 total. These are the funds I usually use to create new bounties.
Just added paypal as an additional option to the funds page.
Ah, right, we wanted to cherry-pick that part from there... - can you do it?
part of this was re-implemented in #4391. the remaining slow path is for computing the unique_csize (and fetching / building an archive index from remote for this).
i removed all the csize stuff. the unique size computation is still expensive.