[zahlman]

Despite appearing to have perfectly ordinary structured static HTML content (aside from the fact that it spams things like <span style="font-weight:bold"> instead of using some basic CSS properly), without JavaScript I only see a solid-colour background.

Anyway, this doesn't offer a whole lot of storage:

  $ python -c 'print(sum(__import__("math").log2(x) for x in range(1, 53)) // 8)'
  28.0

[throwanem]

28 bytes out of ~225 bits, sure. (I compute 228 bits, but precision gets funny with quantities so large. Interestingly, an emulated TI-86 and a real TI-89 Titanium returned different answers; the latter wasn't even divisible by 8!)

For movie-plot '52 pick-up' that's not so bad, especially if used to encode something like a key for the "Solitaire" cryptosystem, mentioned nearby, wherein the same deck can in turn be reconfigured and manipulated to generate an arbitrary-length keystream for application to a longer message transmitted under separate cover.

[pmarreck]

https://deckcrypt.github.io/

45 characters according to the blog post and this demo

[throwanem]

45 code points in a custom 5-bit encoding representing 32 characters; 28 bytes (with 1 to 4 bits left over) of 8-bit ASCII.

[NooneAtAll3]

7 characters of UTF-32