[cs631apue] HW5 - Storing the salt value

[Tejas Nadkarni]

FYI - I just did a git pull and make. I'm getting 400 Bad Request for
everything now - for definitely valid stuff.

I haven't made changes recently so might be some of the stuff Luis did.

Luis when you have a chance can you take a look?

Thanks,
Tejas



On Sun, Dec 8, 2013 at 2:13 PM, Jan Schaumann <jschauma at stevens.edu> wrote:

> lbustama <lbustama at stevens.edu> wrote:
>
> > With my current implementation, the user has to provide the salt both
> > when encrypting and decrypting.
> >
> > Would it make sense to store the salt with he encrypted output? and is
> > it required?
>
> Yes and no.
>
> Storing the sal with the encrypted output is reasonable and commonly
> done.  The drawback is that this requires you to define a specific
> format (even if the format is only "the first N bytes are the salt"),
> which means that the tool wouldn't be compatible with other tools not
> implementing this specific format.
>
> You may choose to see how openssl(1) does this and consider using the
> same format, so that your tool can decrypt data encrypted via
>
> openssl enc -aes-256-cbc -in file -out file.enc -S CAFEFACEDEADBEEF
> ./aed -d <file.enc
>
> However, doing this is not required.
>
> -Jan
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