Re: Encrypted file-size approximation with multiple recipients

2014-04-10 Thread Tim Chase
On 2014-04-07 00:05, Daniel Kahn Gillmor wrote: > It sounds to me like you might be setting up some sort of automated > encrypted JSON message-passing scheme. If so, you should be aware > that if any of the encrypted JSON could be controlled by an > attacker, that attacker could possibly learn inf

Re: Encrypted file-size approximation with multiple recipients

2014-04-06 Thread Daniel Kahn Gillmor
On 04/02/2014 01:07 PM, Tim Chase wrote: > 1) I'd missed that GPG conveniently compresses the data before > encrypting which would explain some of the differences I saw. [...] > in more than half of my use cases (small plain-text/JSON messages) It sounds to me like you might be setting up some

Re: Encrypted file-size approximation with multiple recipients

2014-04-02 Thread Tim Chase
On 2014-04-02 00:37, David Shaw wrote: > This can change pretty significantly given different key lengths, > different algorithms, and perhaps most significantly, how > compressible the original document is (by default GPG compresses > data before encryption). An input file of text will compress v

Re: Encrypted file-size approximation with multiple recipients

2014-04-01 Thread David Shaw
On Apr 1, 2014, at 9:01 PM, Tim Chase wrote: > I've been trying to find a good explanation on how something like > > gpg -r DEADBEEF -r CAFEBABE -r 8BADFOOD -o output.gpg -e input.txt > > works. The best I've been able to find is this: > > http://lists.gnupg.org/pipermail/gnupg-users/2007-Oc

Re: Encrypted file-size approximation with multiple recipients

2014-04-01 Thread Sam Gleske
-BEGIN PGP SIGNED MESSAGE- Hash: SHA512 On April 1, 2014 9:01:28 PM EDT, Tim Chase wrote: >I've been trying to find a good explanation on how something like > > gpg -r DEADBEEF -r CAFEBABE -r 8BADFOOD -o output.gpg -e input.txt > >works. The best I've been able to find is this: > >htt

Encrypted file-size approximation with multiple recipients

2014-04-01 Thread Tim Chase
I've been trying to find a good explanation on how something like gpg -r DEADBEEF -r CAFEBABE -r 8BADFOOD -o output.gpg -e input.txt works. The best I've been able to find is this: http://lists.gnupg.org/pipermail/gnupg-users/2007-October/031938.html I'm mostly interested in the overhead, so