加密
3 条名言。中文为本站译文，每条附日期与原文链接。
一代人以前，多用户分时计算机系统也有过类似的问题。在强加密出现之前，用户只能靠密码保护文件的安全，把隐私托付给系统管理员，相信他会为信息保密。隐私随时可能被管理员凌驾：他会按自己的判断权衡隐私原则与其他考量，或听命于上级。后来强加密走向大众，信任不再是必需品。数据可以用一种方式保护起来，让别人从物理上就无法访问——无论出于什么理由，无论借口多么冠冕堂皇，无论如何。
英文原文
A generation ago, multi-user time-sharing computer systems had a similar problem. Before strong encryption, users had to rely on password protection to secure their files, placing trust in the system administrator to keep their information private. Privacy could always be overridden by the admin based on his judgment call weighing the principle of privacy against other concerns, or at the behest of his superiors. Then strong encryption became available to the masses, and trust was no longer required. Data could be secured in a way that was physically impossible for others to access, no matter for what reason, no matter how good the excuse, no matter what.
SHA-256 非常强。它不像从 MD5 到 SHA1 那样只是渐进的一步。除非出现某种重大的突破性攻击，否则它能撑几十年。
英文原文
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.
如果 SHA-256 被彻底攻破，我想我们可以就麻烦开始之前那条诚实的区块链达成某种共识，把它锁定，然后从那里开始换用新的哈希函数继续。
英文原文
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.