veyepar: securely backing up gpg private keys.. to the cloud‽

Author(s):	Joey Hess
Location	Plenary Hall
Date	jan Mon 16	Days Raw Files
Start	Jan. 16, 2017, 5:40 p.m.	First Raw Start	Jan. 16, 2017, 5:17 p.m.
Duration	0:30:0	Offset	0:22:47
End	Jan. 16, 2017, 6:10 p.m.	Last Raw End	Jan. 16, 2017, 6:17 p.m.
Chapters	00:00 0:03:41
Total cuts_time	30 min.

http://linux.conf.au/schedule/presentation/152/
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Imagine a world in which gpg was not hard to use, and was used widely. Users exchange encrypted email, gpg sign comments on websites, make encrypted backups, and so on.

What happens, in that world, when a user's gpg private key gets deleted? The only backup is encrypted with the lost private key. Catch 22.

We're not in that world, and so we don't often worry about this problem. Unless we've lost gpg key ourselves. But solving the gpg key backup problem seems a necessary step in the path toward that world.

Most ways to back up gpg private keys require physical security, like a safe to keep the key in, and often cumbersome backup and restore procedures.

Keysafe makes backup and restore easy, by backing the private key up to the cloud. It necessarily trades off some security to do so, but manages to make it very expensive to compromise its backups. I'll explain how Argon2, Shamir Secret Sharing, relatively weak passwords, and AES decryption puzzles are combined in keysafe to accomplish this.

Comment:

production notes

2017-01-17/10_17_13.ts Apply: 17:17:13 - 17:24:49 ( 00:07:36 ) S: 17:17:13 - E: 17:47:12 D: 00:29:59 (End: 456.0) show more...

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	Jan. 16, 2017, 5:17 p.m.		seconds: 0.0 Wall: 17:17:13
Duration	00:29:59
	Jan. 16, 2017, 5:47 p.m.		seconds: 456.0 Wall: 17:24:49
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mp4 mp4.m3u	dv.m3u	Split: Sequence:: delete

2017-01-17/10_17_13.ts Apply: 17:24:49 - 17:36:12 ( 00:11:23 ) S: 17:17:13 - E: 17:47:12 D: 00:29:59 (Start: 456.0) (End: 1139.0) show more...

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Duration	00:29:59
	Jan. 16, 2017, 5:47 p.m.		seconds: 1139.0 Wall: 17:36:12
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2017-01-17/10_17_13.ts Apply: 17:36:12 - 17:41:16 ( 00:05:04 ) S: 17:17:13 - E: 17:47:12 D: 00:29:59 (Start: 1139.0) (End: 1443.0) show more...

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	Jan. 16, 2017, 5:17 p.m.		seconds: 1139.0 Wall: 17:36:12
Duration	00:29:59
	Jan. 16, 2017, 5:47 p.m.		seconds: 1443.0 Wall: 17:41:16
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mp4 mp4.m3u	dv.m3u	Split: Sequence:: delete

2017-01-17/10_17_13.ts Apply: 17:43:30 - 17:47:12 ( 00:03:41 ) S: 17:17:13 - E: 17:47:12 D: 00:29:59 (Start: 1577.640571) show more...

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	Jan. 16, 2017, 5:17 p.m.		seconds: 1577.640571 Wall: 17:43:30
Duration	00:29:59
	Jan. 16, 2017, 5:47 p.m.		seconds: 0.0 Wall: 17:17:13
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mp4 mp4.m3u	dv.m3u	Split: Sequence:: delete

2017-01-17/10_47_13.ts Apply: 17:47:13 - 18:14:04 ( 00:26:51 ) S: 17:47:13 - E: 18:17:13 D: 00:30:00 (End: 1611.0) show more...

vlc ~/Videos/veyepar/lca/lca2017/dv/plenary/2017-01-17/10_47_13.ts :start-time=00.0 --audio-desync=0

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	Jan. 16, 2017, 5:47 p.m.		seconds: 0.0 Wall: 17:47:13
Duration	00:30:00
	Jan. 16, 2017, 6:17 p.m.		seconds: 1611.0 Wall: 18:14:04
Comments:
mp4 mp4.m3u	dv.m3u	Split: Sequence:: delete

2017-01-17/10_47_13.ts Apply: 18:14:04 - 18:17:13 ( 00:03:09 ) S: 17:47:13 - E: 18:17:13 D: 00:30:00 (Start: 1611.0) show more...

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	Jan. 16, 2017, 5:47 p.m.		seconds: 1611.0 Wall: 18:14:04
Duration	00:30:00
	Jan. 16, 2017, 6:17 p.m.		seconds: 0.0 Wall: 17:47:13
Comments:
mp4 mp4.m3u	dv.m3u	Split: Sequence:: delete