Issue #1689 has been updated by robin.carey1.
Dear Alex, You seem to be blissfully unaware that it already has "been tweaked" (to use your wording). On 19 January 2015 at 14:24, <[email protected]> wrote: > Issue #1689 has been updated by alexh. > > > We should stay away from non-reviewed work in this area. Bob Jenkins' > IBAA/ISAAC implementations have been used and reviewed a fair number of > times, unlike rcarey's work. > > The main reason we still have IBAA around is as a sort of safety net > against any potential (implementation) bugs in the new CSPRNG. As such, it > sounds like a pretty bad idea to try and tweak it like this. > > IMO this should be closed, but I'll leave it up to you. > > ---------------------------------------- > Bug #1689: IBAA recommendation > http://bugs.dragonflybsd.org/issues/1689#change-12535 > > * Author: robin.carey1 > * Status: Feedback > * Priority: Low > * Assignee: > * Category: Crypto > * Target version: 4.2.x > ---------------------------------------- > Dear DragonFlyBSD bugs. > > DragonFly uses Bob Jenkins' IBAA CSPRNG for /dev/random. > > I have been doing some work on this CSPRNG, which is available from: > > http://www.leopard.uk.com/IBAA64 > > I have two recommendations to make with regard to the IBAA CSPRNG which is > used in DragonFly: > > (1) Use my rounded up BETA=32/SHIFT=20 values as opposed to the original > SHIFT=19 value in the > original IBAA CSPRNG/algorithm (details available from above URL) > > and > > (2) Use a 32-bit counter. This is a minor modification, which gurantees no > bad states (an initial state of all zeroes > maps back to an internal state of all zeroes after 256 iterations), > and > also guarantees a cycle length of at least > 2^32. Details on how to implement the counter are available from the > above URL. It's a minor modification which > has minimal performance impact. > Also, a 64-bit version of IBAA is available from the above URL. Matthew > Dillon seemed to be interested in that, with > regard to the 64-bit x86-64 port of DragonFly (but I haven't heard back > from > him about that). > > ---Files-------------------------------- > unnamed (1.4 KB) > > > -- > You have received this notification because you have either subscribed to > it, or are involved in it. > To change your notification preferences, please click here: > http://bugs.dragonflybsd.org/my/account > -- Sincerely, Robin Carey BSc ---------------------------------------- Bug #1689: IBAA recommendation http://bugs.dragonflybsd.org/issues/1689#change-12538 * Author: robin.carey1 * Status: Feedback * Priority: Low * Assignee: * Category: Crypto * Target version: 4.2.x ---------------------------------------- Dear DragonFlyBSD bugs. DragonFly uses Bob Jenkins' IBAA CSPRNG for /dev/random. I have been doing some work on this CSPRNG, which is available from: http://www.leopard.uk.com/IBAA64 I have two recommendations to make with regard to the IBAA CSPRNG which is used in DragonFly: (1) Use my rounded up BETA=32/SHIFT=20 values as opposed to the original SHIFT=19 value in the original IBAA CSPRNG/algorithm (details available from above URL) and (2) Use a 32-bit counter. This is a minor modification, which gurantees no bad states (an initial state of all zeroes maps back to an internal state of all zeroes after 256 iterations), and also guarantees a cycle length of at least 2^32. Details on how to implement the counter are available from the above URL. It's a minor modification which has minimal performance impact. Also, a 64-bit version of IBAA is available from the above URL. Matthew Dillon seemed to be interested in that, with regard to the 64-bit x86-64 port of DragonFly (but I haven't heard back from him about that). ---Files-------------------------------- unnamed (1.4 KB) -- You have received this notification because you have either subscribed to it, or are involved in it. To change your notification preferences, please click here: http://bugs.dragonflybsd.org/my/account
