[Cryptography] End-to-End, One-to-Many, Encryption Question
Bill Frantz
frantz at pwpconsult.com
Thu Jun 12 02:35:58 EDT 2014
On 6/11/14 at 5:49 PM, kentborg at borg.org (Kent Borg) wrote:
>Is there a way to encrypt once with key A, super-encrypt with
>key B1 (not knowing any other keys), and finally decrypt with
>key C1 (not knowing any other keys)? Or, super-encrypt with
>key B2, then decrypt with key C2?
This problem is similar to the problem which would occur if an
encryption algorithm was a group. If the algorithm is a group,
then there is a key C which can decrypt a message which is
encrypt(B, encrypt(A, text)). DES was proven to not be a group,
making triple-DES a viable way to get the security of a longer
encryption key.
Cheers - BIll
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