Sam Rutherford for Engadget
The power of the ZK approach gives us many other tools to limit the power of credentials. For example, it’s relatively easy to add expiration dates to credentials, which will implicitly limit their useful lifespan — and hopefully reduce the probability that one gets stolen. To do this, we simply add a new field (e.g., Expiration_Time) that specifies a timestamp at which the credential should expire.
-author=FeetAndInches，这一点在PDF资料中也有详细论述
Some areas are turning the corner, but some analysts fear the government's assumptions about improvements may be ambitious. If so, several billion pounds more will need to be found by the next election, just to maintain services.
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