Why Hashids can be decoded?

Ask Time：2018-12-03T05:33:37 Author：Hiroki

I've used this popular library Hashids.

As this poster mentioned,Hashes produced by these algorithms are designed to be 'one-way'. Then, why is it possible for a hash value to be decoded?

I've read the documentation (and searched the issues), but don't see why hashes created by this library can be decoded.

I was about to ask this question in the git repo, but this is a question rather than an issue.

Any insight will be appreciated.

Author:Hiroki，eproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/53584834/why-hashids-can-be-decoded

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