How about a random substitution cipher? This will be ultra-weak, but fast (using bytes.translate/bytes.maketrans) and seems to be the kind of thing you're asking for.
-- Devin On Tue, Jun 23, 2015 at 12:02 PM, Randall Smith <rand...@tnr.cc> wrote: > Chunks of data (about 2MB) are to be stored on machines using a peer-to-peer > protocol. The recipient of these chunks can't assume that the payload is > benign. While the data senders are supposed to encrypt data, that's not > guaranteed, and I'd like to protect the recipient against exposure to > nefarious data by mangling or encrypting the data before it is written to > disk. > > My original idea was for the recipient to encrypt using AES. But I want to > keep this software pure Python "batteries included" and not require > installation of other platform-dependent software. Pure Python AES and even > DES are just way too slow. I don't know that I really need encryption here, > but some type of fast mangling algorithm where a bad actor sending a payload > can't guess the output ahead of time. > > Any ideas are appreciated. Thanks. > > -Randall > > -- > https://mail.python.org/mailman/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
