request information about symetric crypto

Robert J. Hansen rjh at
Mon Feb 28 23:09:11 CET 2011

On 2/28/11 11:01 AM, florent ainardi wrote:
> as regards symetric cipher algorithm, does algorithm included in the
> library manage key with a size greater than 128 bits


> in asymetric mode for the RSA, does the size of the module are
> greater or equal to 2048 bits

Yes (up to 4096).

> do you have more detail on how are built prime number?  if p and q
> are two primes numbers, is there any test during  the generation
> of these numbers ? some tests like : does p = q ?  does the
> internal state for re-treatment of random number is greater than
> 128 bits?

Read the source for these details.

> do you apply the standard and recommandation for the generation
> of prime number?

There is no universal standard, but GnuPG does follow the best practices
for random number generation.

> for random number, do you know if the re-treatment algorythm has a
> non volatil memory as specify in the standard for the generation
> of big random number?  do you know if at this time, the libray has
> vulnerability referenced in the CVE ? and if yes is there any patch
> available ?

I don't understand these questions.

> do you confirm that the library is supported for 32/64 bit windows
> systems and 32/64 bit linux system

Which library -- gpgme, libgcrypt, which?  As far as Linux goes, I've
seen it work on both 32- and 64-bit architectures.  As far as Windows
goes, I've only ever seen them come in 32-bit versions.

In the future, *please* consolidate your questions into one email message.

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