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How to manage the user key in symmetric encryption algorithm?

Source: Internet
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A system that uses a user-logged password for data-encrypted transmission. How to manage the user key effectively and reasonably?

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A system that uses a user-logged password for data-encrypted transmission. How to manage the user key effectively and reasonably?

Didn't want to go back to this ... See the answer upstairs I still write it ...

The symmetric encryption key is the user password after the digest what can be managed ...?

Local cookies stored in JavaScript solution ... The direct solution of the server can ...

Using DES encryption

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