Tariq,

At 2016-01-13 16:58:03 +0500
Tariq Saraj <tariqsa...@gmail.com> wrote:

>         I am working on my MS(InfoSec) Final Thesis "Lightweight solution
> for confidentiality in DNS".
> I just want to raise an issue about DNS confidentiality.
> Encryption is only strong when we don't know about both decryption key and
> plaintext.

I am by no means a cryptographer, but I am pretty certain that this is
not true.

https://en.wikipedia.org/wiki/Known-plaintext_attack

   "Modern ciphers such as Advanced Encryption Standard are not
   currently known to be susceptible to known-plaintext attacks."

> In case with DNS, plaintext is always known. It just a matter of couple of
> tries with domain names such as google, facebook, twitter, hotmail, yahoo
> and youtube etc.
> A simple xoring can return original key used for encryption.

Cheers,

--
Shane

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