[dm-crypt] Future decryption

[dm-crypt] Future decryption

[Antonio Araujo Brett]

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Hi,
Is it possible to use dm-crypt to implement future decryption?
(protecting a document before a predefined time).

Best Regards

Antonio Araujo Brett
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Re: [dm-crypt] Future decryption

[Arno Wagner]

That makes very little sense for filesystem encryption.

And actually, I do not believe there is any good way
way of implementing such a concept in the first place.
Time is just a number to a cryptosystem, and that 
number is one of the very few things that can be well
predicted, hence it can be faked.

Thinks like hardware modules that release a key after a 
predefined time do not count. They are not a cryptographic
approach.

Arno


On Tue, Nov 03, 2009 at 08:37:49AM -0430, Antonio Araujo Brett wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Hi,
> Is it possible to use dm-crypt to implement future decryption?
> (protecting a document before a predefined time).
> 
> Best Regards
> 
> Antonio Araujo Brett
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.9 (GNU/Linux)
> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
> 
> iEYEARECAAYFAkrwKyQACgkQqe/7cduYLGbL3wCgsYg5TOguU0D/a8Zs2EN6MtnN
> lukAoLTWJ0Ojwmq8YyGXPVXQWJ3qzOSY
> =ZNzO
> -----END PGP SIGNATURE-----
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-- 
Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno@wagner.name 
GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25 338F
----
Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans

If it's in the news, don't worry about it.  The very definition of 
"news" is "something that hardly ever happens." -- Bruce Schneier 

Re: [dm-crypt] Future decryption

[Mario 'BitKoenig' Holbe]

Arno Wagner <arno@wagner.name> wrote:
> And actually, I do not believe there is any good way
> way of implementing such a concept in the first place.

If the time difference is big enough you could rely on Moore's Law :)


regards
   Mario
-- 
Ich widerspreche mir selbst?
Nun, gut so: Ich widerspreche mir selbst.
Ich bin gross: ich vermag eine Menge zu fassen.
                                -- Walt Whitman

Re: [dm-crypt] Future decryption

[Arno Wagner]

On Tue, Nov 03, 2009 at 07:47:20PM +0100, Mario 'BitKoenig' Holbe wrote:
> Arno Wagner <arno@wagner.name> wrote:
> > And actually, I do not believe there is any good way
> > way of implementing such a concept in the first place.
> 
> If the time difference is big enough you could rely on Moore's Law :)

Not for a precise timestamp, but yes ;-)

Arno
-- 
Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno@wagner.name 
GnuPG:  ID: 1E25338F  FP: 0C30 5782 9D93 F785 E79C  0296 797F 6B50 1E25 338F
----
Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans

If it's in the news, don't worry about it.  The very definition of 
"news" is "something that hardly ever happens." -- Bruce Schneier 

Re: [dm-crypt] Future decryption

[Antonio Araujo Brett]

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Hash: SHA1

Thanks for your comments.

Antonio Araujo Brett

Arno Wagner escribió:
> That makes very little sense for filesystem encryption.
> 
> And actually, I do not believe there is any good way
> way of implementing such a concept in the first place.
> Time is just a number to a cryptosystem, and that 
> number is one of the very few things that can be well
> predicted, hence it can be faked.
> 
> Thinks like hardware modules that release a key after a 
> predefined time do not count. They are not a cryptographic
> approach.
> 
> Arno
> 
> 
> On Tue, Nov 03, 2009 at 08:37:49AM -0430, Antonio Araujo Brett wrote:
> Hi,
> Is it possible to use dm-crypt to implement future decryption?
> (protecting a document before a predefined time).
> 
> Best Regards
> 
> Antonio Araujo Brett
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