The countries that trusted bugged Swiss encryption devices

Peter Fairbrother peter at tsto.co.uk
Fri Aug 13 12:04:16 PDT 2021


On 13/08/2021 11:06, grarpamp wrote:
>> I heard people recently talking about using _multiple_ OTP's.
>> Not sure how that helps anything but it sounds nice and paranoid.

If the rng is good then using multiple OTPs doesn't gain you anything. If...

> That's probably describing "multiple encryption",
> cascade, or composition.
> 
> https://en.wikipedia.org/wiki/Multiple_encryption
> 
> In the case of properly used OTP's with TRNG's,
> multiple doesn't help anything since the info theoretic security
> of that system has been proven.

Info theoretic security isn't everything - you might want to use an OTP 
then re-encrypt the ciphertext with a block cipher in order to get 
non-malleability *and* info theoretic security.

You might also want to use padding for message length concealment. You 
might want some form of message authentication..

.. and so on.

Peter Fairbrother


More information about the cypherpunks mailing list