The countries that trusted bugged Swiss encryption devices
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.
> 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.
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