Debian DVD ISO Image Verification and Digital Certificate Generation using OpenSSL

1- Debian DVD ISO image verification:
files which are given are downloaded from the link which is provided below:
https://goo.gl/8CNeyc . The ISO picture a long with its mark records both MD5 and
SHA-1 are improved the situation fulfillment.
 Firstly, we will check whether all the files are at correct place or not. for this
we will list all the files in the directory:
 Second, we check for the right mark utilizing the free GNU Privacy Guard
(gpg), we improve the situation of both MD5 and SHA-1So:
The public key was not available on the computer system when we first run
this command onto our system so we use the ID = ‘6294BE9B’ from this
command we are able to retrieve the public key as mentioned below:
 public key with the ID “6294BE9B” the debian keyring server is then
downloaded easily:

 The signature of checksum file is now verified.
The authenticity of Debian DVD image is confirmed using the line saying “Good signature
from "Debian CD signing key <debian- [e-mail]>”. The generated key
fingerprint: DF9B 9C49 EAA9 2984 3258 9D76 DA87 E80D 6294 BE9B can also be used
and it can be compare with the figures listed in https://www.debian.org/CD/verify, the result
shows that it is matched with the given key fingerprint.
 In the final step, we can confirm the substance or content of the ISO picture, to
check that that the ISO picture checksum coordinates the one anticipated from
the checksum document: