dth2331 2016-03-11 21:16
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I'm trying to get my head around JWT tokens in Golang. I'm using github.com/dgrijalva/jwt-go.

What caught me off guard is the fact that I can enter multiple valid signatures.

For example, head over to http://jwt.io - enter MySuperSecretKey for the secret

This token is valid:


as well as this one:


In fact, if I change the last letter to V, W or X, I get a "Signature Verfied" message.

Can anyone tell me what's going on here?

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  • dongyanjing5975 2016-03-14 10:35

    It's the Base64 encoding of the signature which can have the last letter changed to certain targets without affecting the relevant bits.

    Try popping both signatures into a base64->hex decoder and you'll get the same results. In fact at https://conv.darkbyte.ru/ both signatures get re-evaluated to base64 SxshVL42DUH9e7jXUblbBbTwKxhe4jo70DrvbQMlaQ==

    本回答被题主选为最佳回答 , 对您是否有帮助呢?



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