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Show HN: Cryptography, JWT, and ASN1 Debuggers

TheBestTvarynka Friday, January 23, 2026

Hello HN,

For the last 3 years, I have been working on a tool that helps me debug ASN.1-encoded data (keys, certificates, Kerberos/CredSSP/SPNEGO/etc tokens, and more), cryptographic operations, and JWTs. This app is available online; you can try it [0] (no sign-in/up needed).

First, this app supported only various cryptography operations.

Then, I started working with JWTs a lot, and I did not like jwt.io design at all. So, I made my own JWT debugger without ads, banners, and other crap.

And last but not least, I also implemented the ASN1 debugger over the years. The best feature is that you can edit the ASN1 tree directly on the page [1].

I'm happy that I wrote this tool. I use it often to help me debug my protocol implementations. I know that some of my friends use the JWT debugger and ASN1 parser from this tool. Maybe some of you will find it helpful too.

The app is open-source [2]. All computations are performed on the client side. Related submissions: [3], [4].

[0]: https://crypto.qkation.com/

[1]: https://news.ycombinator.com/item?id=46255464

[2]: https://github.com/TheBestTvarynka/crypto-helper

[3]: https://news.ycombinator.com/item?id=46255464

[4]: https://news.ycombinator.com/item?id=46267963

Summary
The article discusses the potential of quantum computing to revolutionize cryptocurrency and blockchain technology, including the challenges of quantum attacks and the development of quantum-resistant cryptography.
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