In real systems we do need to be a bit careful to ensure that the key K is chosen honestly and at random, to avoid a user duplicating another user’s key or doing something tricky. Often real-world issuance protocols will have K chosen jointly by the Issuer and User, but this is a bit too technically deep for a blog post.
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，这一点在体育直播中也有详细论述
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Abstraction is indeed the key of any modularization, and without modularization every hope of being able to guarantee reliability and correctness vanishes.