Good idea!
You're right that I can use it in your way - the combination of symmetric
keys. But remember, if the symmetric key is fast to generate and the code
fast to decrypt - they can decode easily your message using appropriate
attack. The high cost of the asymmetric keys brings you more security,
that's why I am trying to use it in this way.
Bye, Jakub!
Haytham Mohammed wrote:
>
> Hi jakub
>
> I think u want to send an message to multiple of receivers using
> asymmetric algorithm
>
> Note that most public key algorithms are relatively computationally
> costly (relatively slow), in comparison with many symmetric key
> algorithms.
>
> hybrid cryptosystems (public key algorithms and symmetric key
> algorithms) for reasons of efficiency are used;
>
> 1- in such a cryptosystem, a shared secret key ("session key") is
> generated by one party, this session key is then encrypted by each
> recipient's public key.
>
> 2- Each recipient uses the corresponding private key to decrypt the
> session key.
>
> Once all parties have obtained the session key,
>
> 3- they can use a much faster symmetric algorithm to encrypt and decrypt
> messages.
>
> Reference:
> http://en.wikipedia.org/wiki/Public-key_cryptography
>
> Regards
> Haytham
>
>
> Jakub <[EMAIL PROTECTED]> wrote:
>
> Please could somebody tell me, how do I substitute 2 different public
> keys?
> Or, better, encrypt one message for 2 receivers at a time (or using the
> combined key - the same)? (I know that i.e. RSA allows it)
> Bye Jakub
>
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>
>
>
>
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