On 7/31/2010 2:54 PM, Adam Shostack wrote:
On Sat, Jul 31, 2010 at 06:44:12PM +1200, Peter Gutmann wrote:
| Apparently the DNS root key is protected by what sounds like a five-of-seven
| threshold scheme, but the description is a bit unclear. Does anyone know
| more?
|
| (Oh, and for people who want to quibble over "practically-deployed", I'm not
| aware of any real usage of threshold schemes for anything, at best you have
| combine-two-key-components (usually via XOR), but no serious use of real n-
| of-m that I've heard of. Mind you, one single use doesn't necessarily count
| as "practically deployed" either).
We had a 3 of 7 for the ZKS master keys back in the day. When we
tested, we discovered that no one had written the secret-combining
code, and so Ian Goldberg wrote some and posted it to usenix for
backup.
At RSA Security back in the early 2000s, I devised protection schemes,
and wrote product code using 5 of 7 Shamir secret sharing for certain
products.
Peter Trei
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