Ouais, bof. Comme souvent c'est surtout les commentaires qu'il faut lire. L'un deux renvoit vers une déclaration de Satoshi Nakamoto lui-même:
« SHA-256 is very strong. It's not like the incremental step from MD5 to SHA1. It can last several decades unless there's some massive breakthrough attack.
If SHA-256 became completely broken, I think we could come to some agreement about what the honest block chain was before the trouble started, lock that in and continue from there with a new hash function.
If the hash breakdown came gradually, we could transition to a new hash in an orderly way. The software would be programmed to start using a new hash after a certain block number. Everyone would have to upgrade by that time. The software could save the new hash of all the old blocks to make sure a different block with the same old hash can't be used. »
[^] # Re: Est ce que le bitcoin résistera ...
Posté par grondilu . En réponse au sondage Que pensez-vous des bitcoins ?. Évalué à 1.
Ouais, bof. Comme souvent c'est surtout les commentaires qu'il faut lire. L'un deux renvoit vers une déclaration de Satoshi Nakamoto lui-même:
« SHA-256 is very strong. It's not like the incremental step from MD5 to SHA1. It can last several decades unless there's some massive breakthrough attack.
If SHA-256 became completely broken, I think we could come to some agreement about what the honest block chain was before the trouble started, lock that in and continue from there with a new hash function.
If the hash breakdown came gradually, we could transition to a new hash in an orderly way. The software would be programmed to start using a new hash after a certain block number. Everyone would have to upgrade by that time. The software could save the new hash of all the old blocks to make sure a different block with the same old hash can't be used. »
http://forum.bitcoin.org/?topic=191.msg1585#msg1585