[Cryptography] Practicality of codebook in current-day secret communications

[Henry Baker]

At 03:00 PM 2/24/2016, Tom Mitchell wrote:
>On Wed, Feb 24, 2016 at 11:58 AM, mok-kong shen <mok-kong.shen at t-online.de> wrote:
>
>Codebook appears, if I don't err, to be an antiquitated topic rarely
>touched upon in discussions of modern cryptography.

Most 19th C. codebooks were primarily used for compression, since cables were charged by the length of the message, and were terribly expensive.

To the extent that you used a proprietary codebook, it might ensure some confidentiality, as well.