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Clarify rotation in 1.9 #74

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Clarify rotation in 1.9 #74

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e3d308d
clarify rotation
mnm678 Dec 13, 2019
ceb0a0e
whitespace issues
mnm678 Dec 13, 2019
22f5855
clarify what threshold to use
mnm678 Dec 18, 2019
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3 changes: 2 additions & 1 deletion tuf-spec.md
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Expand Up @@ -1116,7 +1116,8 @@ repo](https://github.com/theupdateframework/specification/issues).
cycle, report the potential freeze attack. On the next update cycle, begin
at step 0 and version N of the root metadata file.

* **1.9**. **If the timestamp and / or snapshot keys have been rotated, then
* **1.9**. **If a threshold of timestamp and / or snapshot keys have been
removed (compared to verion N of the root metadata), then
delete the trusted timestamp and snapshot metadata files.** This is done in
order to recover from fast-forward attacks after the repository has been
compromised and recovered. A _fast-forward attack_ happens when attackers
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