Create Verify_ISO_14.04.4.1.md

Author: dougburks

Verify_ISO_14.04.4.1.md

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+ISO image:  
+https://github.com/Security-Onion-Solutions/security-onion/releases/download/v14.04.4.1/securityonion-14.04.4.1.iso  
+
+Signature for current ISO image:  
+https://github.com/Security-Onion-Solutions/security-onion/raw/master/securityonion-14.04.4.1.iso.sig  
+
+Signing key:  
+https://raw.githubusercontent.com/Security-Onion-Solutions/security-onion/master/KEYS  
+
+For example, here are the steps you can use on most Linux distributions to download and verify our Security Onion ISO image.
+
+Download the signing key:  
+```
+wget https://raw.githubusercontent.com/Security-Onion-Solutions/security-onion/master/KEYS
+```
+
+Import the signing key:  
+```
+gpg --import KEYS
+```
+
+Download the signature file for the ISO:  
+```
+wget https://github.com/Security-Onion-Solutions/security-onion/raw/master/securityonion-14.04.4.1.iso.sig
+```
+
+Download the ISO image:  
+```
+wget https://github.com/Security-Onion-Solutions/security-onion/releases/download/v14.04.4.1/securityonion-14.04.4.1.iso
+```
+
+Verify the downloaded ISO image using the signature file:  
+```
+gpg --verify securityonion-14.04.4.1.iso.sig securityonion-14.04.4.1.iso
+```
+
+The output should show "Good signature" and the Primary key fingerprint should match what's shown below:
+```
+gpg: Signature made Sat 19 Mar 2016 12:02:50 PM UTC using RSA key ID ED6CF680
+gpg: Good signature from "Doug Burks <[email protected]>"
+gpg: WARNING: This key is not certified with a trusted signature!
+gpg:          There is no indication that the signature belongs to the owner.
+Primary key fingerprint: BD56 2813 E345 A068 5FBB  91D3 788F 62F8 ED6C F680
+```
+
+Once you've verified the ISO image, you're ready to proceed to our Installation guide:  
+https://github.com/Security-Onion-Solutions/security-onion/wiki/Installation