[cryptography] Design Strategies for Defending against Backdoors

Thierry Moreau thierry.moreau at connotech.com
Mon Nov 18 12:58:40 EST 2013


ianG wrote:
> On 18/11/13 10:27 AM, ianG wrote:
>> In the cryptogram sent over the weekend, Bruce Schneier talks about how
>> to design protocols to stop backdoors.  Comments?
> 
> 
> To respond...
> 
>> https://www.schneier.com/blog/archives/2013/10/defending_again_1.html
>>
>> Design Strategies for Defending against Backdoors
>>

...

>>      Encryption protocols should be designed so as not to leak any
>> random information. Nonces should be considered part of the key or
>> public predictable counters if possible. Again, the goal is to make it
>> harder to subtly leak key bits in this information.
> 
> 
> Right, that I agree with.  Packets should be deterministically created 
> by the sender, and they should be verifiable by the recipient.
> 

Then you lose the better theoretical foundations of probabilistic 
signature schemes ...



-- 
- Thierry Moreau



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