TODO.md: add ideas

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diff --git a/TODO.md b/TODO.md
index e05b0db..82ad606 100644
--- a/TODO.md
+++ b/TODO.md
@@ -72,6 +72,14 @@ this stuff may not make any sense.
   https://www.brendangregg.com/blog/2021-07-03/how-to-add-bpf-observability.html  https://qmonnet.github.io/whirl-offload/2021/09/23/bpftool-features-thread/
   https://github.com/iovisor/bcc
   (plus kernel docs)
+* gpg keys, 2021:
+  https://musigma.blog/2021/05/09/gpg-ssh-ed25519.html
+* compression: huffman coding vs arithmetic coding versus asymmetric
+  number system compared to shannon entropy (`H(X) = Σ p(x) log_2(p(x))`)
+  https://neptune.ai/blog/lossless-data-compression-using-arithmetic-encoding-in-python-and-its-applications-in-deep-learning
+  (zstd rfc, which uses ans)
+  (zlib compression doc)
+  https://kedartatwawadi.github.io/post--ANS/
 
 ## done
 * add project folders