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이준김

I build textmachine.org, a free client-side suite of text and classical-cipher tools. I write about the arithmetic behind cryptanalysis tools and where the usual implementations go wrong.

Joined on Aug 21, 2026 https://textmachine.org/en

이준김

Aug 24

Adaptive PNG filtering made my animations 2.4x bigger

#javascript #webdev #performance #webperf

6 min read

이준김

Aug 23

A GIF re-encode made the file 4.5x bigger. Interframe differencing fixed it.

#javascript #webdev #performance #webperf

5 min read

이준김

Aug 22

Search Console found one 502. All 11 locales were broken, and no test could have caught it.

#nextjs #webdev #debugging #seo

4 min read

이준김

Aug 22

Compressing an image to an exact file size, in the browser

#programming #javascript #webdev #performance

7 min read

이준김

Aug 21

You don't search for the key, you search for English: how cipher auto-solvers actually work

#cryptography #algorithms #javascript

5 min read

이준김

Aug 21

I shipped a Kasiski calculator with 21 passing tests. It got 3 of 5 key lengths wrong.

#cryptography #testing #javascript

6 min read

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