Inspired by Chris's HMAC cipher

I came up with the following idea.

Register a webpage at nekoweb.org, use an API key
and send encrypted messages to the web page, which
later Bob and Alice can decrypt.

https://pollux.nekoweb.org

Alice does:

$ xchacha20 key iv < msg.txt | b2h | hex2img -b 0 -v | xml2html > index.html && neko

Process completed in 4.7553ms

Files uploaded

While Bob does:

$ curl https://pollux.nekoweb.org | xml2html -d | hex2img -v -d | b2h -d | xchacha20 key iv
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   825    0   825    0     0   4881      0 --:--:-- --:--:-- --:--:--  4881
Hello sci.crypt! :-)

Process completed in 191.3448ms

Thus allowing Alice and Bob to exchange messages without email usage and
without visiting a website with a browser.

Hope you like the idea!

--
Regards
Stefan