Symmetric encryption - options?

[Hauke Laging]

Am Dienstag, 13. März 2012, 13:15:26 schrieb Robert J. Hansen:
> On 3/13/2012 7:09 AM, Eric Christensen wrote:
> > Because this is symmetric encryption.  You would need to sign the data
> > to get integrity protection.
> 
> This isn't quite right.  He's getting warned about the lack of an MDC,
> which is related to the symmetric algorithm choice.

Would you explain that? Do symmetric algorithms never have an MDC or does just 
CAST5 not (why is it the default then)?


Hauke
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