weblog d’un abbe

20070126

Decrypting Gmane addresses

Filed under: Fun — abbe @ 1719

I’ve found a way to decrypt Gmane encrypted addresses. The encryption is quite easy. What they’re probably doing is calculating the hash (or any unique id) based on the domain portion of the email address and then appending the it to the username portion of the email address. And finally, add @public.gmane.org domain name. e.g. Hash for gmail.com domain is Re5JQEeQqe8AvxtiuMwx3w. Now to encrypt any @gmail.com address, say wahjava@gmail.com, we will pipe the email address to this sed command line: |sed -e 's/@gmail.com/-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org/'. So to encrypt wahjava@gmail.com, we’ll do: echo wahjava@gmail.com |sed -e 's/@gmail.com/-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org/'.

To decrypt it, if you’ve plenty of bandwidth, visit this URL: http://gmane.org/get-address.php?address=wahjava-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org. Or if you run GNU, just: echo wahjava-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org |sed -e 's/-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org/@gmail.com/' will decrypt it.

Following is a shell script, which contains decryption for some domain names:

#!/bin/sh
# gmane-decrypt.sh
exec sed -e 's/%2d/-/' -e 's/%2b/+/' -e 's/%2f/\//' -e 's/%40/@/'\
 -e 's/-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org/@gmail.com/'\
 -e 's/-\\/E1597aS9LQAvxtiuMwx3w@public.gmane.org/@yahoo.com/'\
 -e 's/-cunTk1MwBs8\\/MmOfgqcDl+ys7Bb73OIl@public.gmane.org/@lists.linux-delhi.org/'\
 -e 's/-T2eDObkLWuUhGesrpoKtVg@public.gmane.org/@linux-delhi.org/'\
 -e 's/-qF0zOz33zB8dnm+yROfE0A@public.gmane.org/@au-kbc.org/'

Now to use it, just curl the URL, and pipe to this script. And you’re done. :)

P.S. BtW, Gmane didn’t use hashing it uses encryption. How ?

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2 Comments »

  1. Nice one dude :)

    Comment by makuchaku — 20070127 @ 1916

  2. Thanks

    Comment by आशीष शुक्ल — 20070127 @ 2051


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