21–30 of 58 posts
With something as important as blockchain verification, you would think DARPA would stop investing in private intellectual property.
Why is blockchain 'important' to Darpa? Because you are rooting for bitcoin or for some other non-specific to you reason? edit: Updated question to be more clear of intention
https://www.bloomberg.com/news/articles/2016-04-25/u-s-wants...
Wait -- mathematical assurances that a system works only as intended in all cases? That's not possible. It pretends that the Turing Halting problem[1] is soluble.
Not that this claim is at all uncommon. I regularly see similar claims about software validation, by people who either do not know, or who don't want to acknowledge, that this problem cannot be solved in the general case.
1. https://en.wikipedia.org/wiki/Halting_problem : "Alan Turing proved in 1936 that a general algorithm to solve the halting problem for all possible program-input pairs cannot exist."
Quote: "Galois is a leader in formal verification, a technique that goes beyond testing and evaluation to provide mathematical assurances that a system works only as intended in all cases." Wait -- mathematical assurances that a system works only as intended in all cases ? That's not possible. It pretends that the Turing Halting problem[1] is soluble. Not that this claim is at all uncommon. I regularly see similar cl…
Guardtime is set of tooling around a FIPS 140 timestamping appliance. Systems on the network submit hashes of their logs to the time stamping. Assuming the appliance remains secure, you can go back in the event of compromise and prove that your logs are unaltered up to a certain point. It's amazing that they seem to have built a $50 -$100 million dollar business here.
>> "Assuming the appliance remains secure" Makes me wonder what mathematics would prove this, or if it's assumed to be out of scope, and if so, what else is out of scope too.
Quote: "Galois is a leader in formal verification, a technique that goes beyond testing and evaluation to provide mathematical assurances that a system works only as intended in all cases." Wait -- mathematical assurances that a system works only as intended in all cases ? That's not possible. It pretends that the Turing Halting problem[1] is soluble. Not that this claim is at all uncommon. I regularly see similar cl…
Quote: "Galois is a leader in formal verification, a technique that goes beyond testing and evaluation to provide mathematical assurances that a system works only as intended in all cases." Wait -- mathematical assurances that a system works only as intended in all cases ? That's not possible. It pretends that the Turing Halting problem[1] is soluble. Not that this claim is at all uncommon. I regularly see similar cl…
if(x Validation and verification are very different things. Verification is "my program meets these formal specs". Validation is "my specs accurately encodes the whole problem". Indeed, there's no way to do validation in a provably correct way. (But, of course, mathematics and statistics can help :-) ). The good news is that a lot of security and other bugs arise even once you have the correct spec. So verification can be useful even if it's impossible to perfectly validate.
> by people who either do not know, or who don't want to acknowledge, that this problem cannot be solved in the general case.
It's somehow ironic that you invoke the Talking problem since Turing himself -- AFTER having proven the Halting problem -- basically conjectured the creation of formal methods.
Quote: "Galois is a leader in formal verification, a technique that goes beyond testing and evaluation to provide mathematical assurances that a system works only as intended in all cases." Wait -- mathematical assurances that a system works only as intended in all cases ? That's not possible. It pretends that the Turing Halting problem[1] is soluble. Not that this claim is at all uncommon. I regularly see similar cl…
Guardtime is set of tooling around a FIPS 140 timestamping appliance. Systems on the network submit hashes of their logs to the time stamping. Assuming the appliance remains secure, you can go back in the event of compromise and prove that your logs are unaltered up to a certain point. It's amazing that they seem to have built a $50 -$100 million dollar business here.
>> "Assuming the appliance remains secure" Makes me wonder what mathematics would prove this, or if it's assumed to be out of scope, and if so, what else is out of scope too.
Quote: "Galois is a leader in formal verification, a technique that goes beyond testing and evaluation to provide mathematical assurances that a system works only as intended in all cases." Wait -- mathematical assurances that a system works only as intended in all cases ? That's not possible. It pretends that the Turing Halting problem[1] is soluble. Not that this claim is at all uncommon. I regularly see similar cl…
Earlier quoted context omitted.
The blockchain is critical current & future technology, it's future is independent of Bitcoin's future. Bitcoin is the first implementation of a blockchain system, but it's a technology, not Bitcoin. All major log systems will be based on it; governments, banks, military, voting systems, etc. Highly suggest reading the Wikipedia entry on Blockchain to learn more and think about how you might use it too: https://en.m.…
I'm a blockchain blockhead. Any more suggested reading? Really basic like a) how will my debit card debit my money buying DD coffee? If I create another book can I "get blockchain" (so to speak) to protect my work? Thus, I will need to make the right choice to be covered under a blockchain or not? At 50000 ft I get the significance I think. I just cant even come close to explaining it.
It's available from O'Reily: http://shop.oreilly.com/product/0636920032281.do