[Haskell-beginners] Cryptography

Joan Josep Jiménez Puig jjimenez at salle.url.edu
Wed Oct 8 03:22:38 EDT 2008

Hi, in principle AES is a symmetric encryption algorithm so it does not
have public/private key pairs. It only has one key used to both
encrypt and decrypt. What you want is RSA

On Wed, Oct 8, 2008 at 9:14 AM, Jeffrey Drake <jeffd at techsociety.ca> wrote:

> I have an application where I would like to use AES to have a
> public/private key pair and digitally sign/verify documents.
> I have found documentation for a library that does the encryption:
> http://www.haskell.org/crypto/doc/html/Codec-Encryption-AES.html
> However, it seems to have only two methods:
> encrypt :: AESKey a => a -> Word128 -> Word128
> decrypt :: AESKey a => a -> Word128 -> Word128
> A problem for me, I don't know where AESKey is supposed to come from, or
> how to use this to sign things. My ignorance of this topic does not
> help. Would it be correct to say that signing a document is similar to
> an MD5 hash on a document?
> In addition, this project requires a matching python component (that
> works together with the haskell). I am in a similar situation, I have
> found this: http://bitconjurer.org/rijndael.py that provides a similar
> functionality. But it seems to provide insights (and thus portability to
> haskell) on how to generate the public/private keys by providing a
> single key and performing a lot of math on it to generate the two pairs.
> But it still does not help me sign anything.
> Any help whatsoever on this topic is welcome.
> With regards,
> Jeffrey.
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