[openssl-users] different encrypted text for the same plain text message

Jakob Bohm jb-openssl at wisemo.com
Fri Jul 29 08:43:14 UTC 2016

On 29/07/2016 09:23, R-D intern wrote:
> Hello Benjamin,
> Thanks for the reply.
> I know the purpose and benefit of creating different cipher texts of the
> same corresponding plain text.But I would like to know about the places
> where this randomness gets introduced to create different encrypted
> texts.Because SSL handshake takes place only once. After creation of  pre
> secret key(for an entire session) at both the client and the server ends,
> master key is created based on pre secret key, identifier label, client and
> server random numbers which is again maintained for an entire session . The
> master key is responsible for creating MAC key, bulk encryption key and IV
> for client - server  read - write.  If the bulk encryption key (which is
> responsible for encrypting the message ) for an entire session is fixed and
> constant, then how is the encrypted text different?
> Regards,
> Suman
The IV changes.  The precise method of changing the IV
depends on the TLS version, because the method used in
SSL 3 and TLS 1.0 was not as secure as it should be.


Jakob Bohm, CIO, Partner, WiseMo A/S.  https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark.  Direct +45 31 13 16 10
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