[userbinator]

The checksums in the left column of the listings innocuously looked to the casual observer kind of like line numbers, which may have contributed to their true subversive purpose flying under the radar.

Are you implying there's something more interesting there than just the DES source code and related data that the book already very clearly claims to contain?

[some_random]

I don't think so, I think the OP's just trying to be dramatic?

[jethro_tell]

PGP already did this a few years before. It wasn't a secret what was being done, it just had no legal recourse for stopping it.

It's a bit dramatic to imply this was covert in anyway.