Re: [PATCH v6 3/5] random: use SipHash in place of MD5

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi Andy,

> Agreed.  A simpler contruction would be:
>
> chaining++;
> output = H(chaining, secret);
>
> And this looks a whole lot like Ted's ChaCha20 construction.

In that simpler construction with counter-based secret rekeying and in
Ted's ChaCha20 construction, the issue is that every X hits, there's a
call to get_random_bytes, which has variable performance and entropy
issues. Doing it my way with it being time based, in the event that
somebody runs ` :(){ :|:& };:`, system performance doesn't suffer
because ASLR is making repeated calls to get_random_bytes every 128 or
so process creations. In the time based way, the system performance
will not suffer.

Jason
--
To unsubscribe from this list: send the line "unsubscribe linux-crypto" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Kernel]     [Gnu Classpath]     [Gnu Crypto]     [DM Crypt]     [Netfilter]     [Bugtraq]

  Powered by Linux