Tanya Khovanova gives a great simple example of a one-way function, which is becoming dated. She's looking for other examples. Can you help her out?
A one-way function can be used to encode a message. To decode the message, we'd want to go backwards, using the inverse of the function. It's very hard to compute the inverse of a good one-way function. Anything involving financial transactions online should use a secure encoding.
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