Encryption Question

I have a form where a user can change his password, but I'm confused
on how to prevent this from being transmitted in plain text.

Well, I know how not to transmit it in plain text - use any type of
encryption, but then the problem is, how do I decrypt it on the server
to store it?

If I use some type of key based encryption, the how do I get the key
to the client without it being intercepted, rendering the whole
process useless.

My question is, how can I set up secure password change functionality
on my site?

.

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