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epriestley 8a4bf38655 Use 160-bit TOTP keys rather than 80-bit TOTP keys
Summary:
See <https://hackerone.com/reports/435648>. We currently use 80-bit TOTP keys. The RFC suggests 128 as a minimum and recommends 160.

The math suggests that doing the hashing for an 80-bit key is hard (slightly beyond the reach of a highly motivated state actor, today) but there's no reason not to use 160 bits instead to put this completely out of reach.

See some additional discussion on the HackerOne report about enormous key sizes, number of required observations, etc.

Test Plan: Added a new 160-bit TOTP factor to Google Authenticator without issue.

Reviewers: amckinley

Reviewed By: amckinley

Differential Revision: https://secure.phabricator.com/D19792
2018-11-07 15:44:02 -08:00
bin Add a "lock log" for debugging where locks are being held 2018-03-05 17:55:34 -08:00
conf Support "ssl.chain" in Aphlict configuration 2016-04-14 10:41:21 -07:00
externals Add profile images to Repositories 2017-06-12 07:51:39 -07:00
resources Remove nonfunctional AJAX embed behavior for Slowvote 2018-11-06 09:20:07 -08:00
scripts Improve aesthetics of commit hook rejection message 2018-11-06 09:39:48 -08:00
src Use 160-bit TOTP keys rather than 80-bit TOTP keys 2018-11-07 15:44:02 -08:00
support Append the intermediate chain to the "cert" parameter in Aphlict 2018-06-26 19:34:28 +00:00
webroot Remove nonfunctional AJAX embed behavior for Slowvote 2018-11-06 09:20:07 -08:00
.arcconfig Set "history.immutable" to "false" explicitly in .arcconfig 2016-08-03 08:12:49 -07:00
.arclint Begin adding test coverage to GitHub Events API parsers 2016-03-09 09:30:07 -08:00
.arcunit Use the configuration driven unit test engine 2015-08-11 07:57:11 +10:00
.editorconfig Fix text lint issues 2015-02-12 07:00:13 +11:00
.gitignore Make i18n string extraction faster and more flexible 2016-07-04 10:23:30 -07:00
LICENSE Fix text lint issues 2015-02-12 07:00:13 +11:00
NOTICE Update Phabricator NOTICE file to reflect modern legal circumstances 2014-06-25 13:42:13 -07:00
README.md Remove push to IRC from "readme.md" too 2015-10-24 18:39:16 -07:00

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