[1letterunixname]

Bah. Should've used PCX files for that extra steganographic space goodness. (JPG is too easy.)

If you can't create punchcards or hex blindfolded, there are always tools:

[pdf] https://www.pedramhayati.com/images/docs/survey_of_steganogr...

[zip] https://ftp.funet.fi/pub/crypt/archive/idea.sec.dsi.unimi.it...

[zip] https://web.archive.org/web/20230828124101/https://dl.packet...