[oss] [Assignment 3] 3rd exercise. Recover modulus

[Radu Caragea]

We will continue this discussion on the oss-support at cursuri.cs.pub.ro list.

On Sat, Jan 16, 2016 at 9:21 PM, Catalin Vasile <catalinvasile92 at gmail.com>
wrote:

> This e-mail contains utilities to recover the modulus, but since I do
> not present a formula or too special program, I don' think I'm
> offering any threating information.
>
> After running the command to get my publickey (as specified in the
> assignment) and receiving this output:
> gpg: directory `/home/vasile.catalin/.gnupg' created
> gpg: new configuration file `/home/vasile.catalin/.gnupg/gpg.conf' created
> gpg: WARNING: options in `/home/vasile.catalin/.gnupg/gpg.conf' are
> not yet active during this run
> gpg: keyring `/home/vasile.catalin/.gnupg/secring.gpg' created
> gpg: keyring `/home/vasile.catalin/.gnupg/pubring.gpg' created
> Reading passphrase from file descriptor 0
> gpg: AES256 encrypted data
> gpg: encrypted with 1 passphrase
> ssh-rsa
> AAAAB3NzaC1yc2EAAAADAQABAAABAQCK4ODFGfqxuTzFWipgx+vyozmr+UHb/ALXraoE+fs6hoR3wC+oVSGMX8mAd5sZm1swjQNuT+5Qyxj4FVdBmcT61KgFIqHsj/43hMiKBgr/CpAqBlHv5u8EioLYTb4vLBuqTwGR6PqF2Soau0ODrttuvZqFUgJ8qoRzmWPMiLTHXSshJa1B1zbSdTlgegTgqg7AeVwf6Lzh7ySpfU4ibgpiBIWyXSQPwGk+AYiviy17/y3o4PEfswcK9lKHIhsgPGHf+WYMOpbwxko53fCsapCo/6aeBAusHGQriGHs2pAFf26V0+0Uu1ei1gQIdsz7n919RqyP
>
> I considered this to be the public key:
>
> AAAAB3NzaC1yc2EAAAADAQABAAABAQCK4ODFGfqxuTzFWipgx+vyozmr+UHb/ALXraoE+fs6hoR3wC+oVSGMX8mAd5sZm1swjQNuT+5Qyxj4FVdBmcT61KgFIqHsj/43hMiKBgr/CpAqBlHv5u8EioLYTb4vLBuqTwGR6PqF2Soau0ODrttuvZqFUgJ8qoRzmWPMiLTHXSshJa1B1zbSdTlgegTgqg7AeVwf6Lzh7ySpfU4ibgpiBIWyXSQPwGk+AYiviy17/y3o4PEfswcK9lKHIhsgPGHf+WYMOpbwxko53fCsapCo/6aeBAusHGQriGHs2pAFf26V0+0Uu1ei1gQIdsz7n919RqyP
>
> When using this[1] method, it gives me errors trying to decipher the
> modulus:
> unable to load Public Key
> 140611597174440:error:0906D064:PEM routines:PEM_read_bio:bad base64
> decode:pem_lib.c:812:
>
> vasile.catalin at jim:~/tema3$ cat pubkey.txt
> -----BEGIN PUBLIC KEY-----
>
> AAAAB3NzaC1yc2EAAAADAQABAAABAQCK4ODFGfqxuTzFWipgx+vyozmr+UHb/ALXraoE+fs6hoR3wC+oVSGMX8mAd5sZm1swjQNuT+5Qyxj4FVdBmcT61KgFIqHsj/43hMiKBgr/CpAqBlHv5u8EioLYTb4vLBuqTwGR6PqF2Soau0ODrttuvZqFUgJ8qoRzmWPMiLTHXSshJa1B1zbSdTlgegTgqg7AeVwf6Lzh7ySpfU4ibgpiBIWyXSQPwGk+AYiviy17/y3o4PEfswcK9lKHIhsgPGHf+WYMOpbwxko53fCsapCo/6aeBAusHGQriGHs2pAFf26V0+0Uu1ei1gQIdsz7n919RqyPp/1SzLycigtG4Gpn
> -----END PUBLIC KEY-----
>
> Am I doing something wrong in recovering the key?
>
> Cătă
>
> [1] http://crypto.stackexchange.com/a/18034
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