The only way to guarantee that the public key signature is from the owner is for the owner to hand you the key on a disk, in person.
保证公共密钥签名来自所有者的惟一方法是，密钥的所有者亲自把磁盘上的密钥交给您。
Alternative way of creating a primary key and foreign key.
另外一种创建主键和外键的方式。
Remember the way dictionary works, this is the key. Is the key of a value.
记住这个字典的工作原理，这是关键，它是值的关键。
Remember the way dictionary works, this is the key. Is the key of a value.
记住这个字典的工作原理，这是关键，它是值的关键。
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