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When you generate a token you can set a name and symbol, but this is not unique, that means that another smart contract made by another person may have the same name or symbol.

Is this a problem if a hacker wants to impersonate a token to make operations on behalf of the real token?

How can this be avoid? Or there is something in the creation of the token than makes impersonation not possible?

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There's nothing you can do to avoid this. That is why you will see most ICO owners go the extra mile to communicate the exact address someone should be making a transfer to. You can't trust neither the token name nor the symbol, only the address.

There was a proposal going around for building a registry of token names/symbols so they would be unique, but I don't know where that stands as of this date.

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  • That solves the problem at the initial coin distribution, but how to avoid for example to receive impersonated tokens at an exchange?
    – Moisés Briseño Estrello
    Commented Nov 8, 2017 at 3:09

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