For the last 3 years, I have been working on a web tool to help me at work: debugging ASN1-encoded data (keys, certificates, Kerberos/CredSSP/SPNEGO/etc data structures, and more) and performing various cryptographic operations. This app is available online; you can try it [0] (no sign-in/up needed).

This December, I reached a huge milestone: I implemented ASN1 tree editing [1]. Now I can edit the ASN1 tree directly in the browser (read my blog post for more details: [2]).

I'm happy that I wrote this tool. I use it often to help me debug my protocol implementations and/or debugging. 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.

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

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

[2]: https://tbt.qkation.com/posts/announcing-crypto-helper-0-16/