
Date: Mon, 19 Oct 2015 22:16:19 0600 From: Kurt Seifried <kseifried@...hat.com> To: osssecurity <osssecurity@...ts.openwall.com> Cc: Seth Arnold <seth.arnold@...onical.com> Subject: Re: Prime example of a can of worms On Mon, Oct 19, 2015 at 3:40 PM, Daniel Kahn Gillmor <dkg@...thhorseman.net> wrote: > > On the flip side, saying "use only strong (>=2048bit today in 2015?), > wellknown, wellstructured, publiclyvetted groups" is very simple > guidance: clear and easy to follow. > > A move to wellknown, large safe primes seems simpler/saner than trying > to work with an environment where peers are generating new primes which > may or may not be wellformed. (similarly, we're converging on a world > where there are a few trusted, wellvetted, welloptimized DH groups for > elliptic curve DH, because encouraging arbitrary ECDH groups ends up > being sketchier for everyone) > > dkg > So it occurs to me that we have no corpus of data on Diffie Helman primes. With this in mind I would like to create one. Openssl command line can easily create them, using either the 2 (default) or 5 generator (explained at http://security.stackexchange.com/questions/54359/whatisthedifferencebetweendiffiehellmangenerator2and5 ) For example the following code: #!/bin/bash for i in `seq 1 100`; do openssl dhparam 2048 text >> $i done will generate 100 2048 bit primes. If you can ideally simply commit the files to the following github repo: https://github.com/RedHatProductSecurity/DiffieHellmanPrimes/ simply create a directory in the root with your name/whatever you want to call it (nothing rude please) and have a "2048" directory for the 2048 bit primes and a "4096" directory for the 4096 bit primes I would appreciate it. If you use a tool other than OpenSSL command line to generate the primes please make a note of it (especially any command line options used) in a .txt file in the root of your data directory. My goal is to collect a few million primes of each size so we have some real data to work with.  Kurt Seifried  Red Hat  Product Security  Cloud PGP A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993 Red Hat Product Security contact: secalert@...hat.com
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