[rc5] Suggestion for protocol

Anthony Towns aj at humbug.org.au
Wed Jun 25 22:59:41 EDT 1997


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On Tue, 24 Jun 1997, Tim Charron wrote:

> There's a simpler way.  When a client receives a block, it's checking 
> 2^28 different keys.  Instead of doing a checksum on all of that, 
> have it do a checksum every 2^18 keys (for example).  [...]

One problem with specifying a subset of keys in advance is that the
attacker could simply check those keys without any others. In this
case it would be four keys in one million. Anyone want an apparent key
rate 250,000 times higher than their current one?

Personally, I don't think this is a huge concern for RC5 or the v2
clients. Some attack-resistance will be necessary for v3 though, IMO.

Cheers,
aj

- --
Anthony Towns <aj at humbug.org.au> <http://student.uq.edu.au/~s343676/>
I don't speak for anyone save myself. PGP encrypted mail preferred.

``Like the ski resort of girls looking for husbands and husbands looking
  for girls, the situation is not as symmetrical as it might seem.''

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