Category Archives: Crypto

Extracting Private Key from FortiGate Firewall

Why would you need to export the private key when you create a CSR on the FortiGate.  If for instance,…

By Manny Fernandez

August 30, 2022

Extracting Your Private Key from a .pfx certificate

I had a customer that installed a wildcard certificate on an Exchange server.  Later they wanted to use the same…

By Manny Fernandez

August 30, 2022

What Diffie-Hellman (DH) Group Should I Use

There has been a lot around Diffie-Hellman groups and which ones to use.  Some think that the bigger the DH…

By Manny Fernandez

January 7, 2020

Encrypting a USB Thumb-Drive on macOS from CLI and GUI

There are a couple of ways to encrypt drives and volumes on macOS X.  I recommend that if you are…

By Manny Fernandez

January 1, 2020

Troubleshooting IPSec VPNs on Fortigate Firewalls

Lets start with a little primer on IPSec.  I am going to describe some concepts of IPSec VPNs. IPSec Primer…

By Manny Fernandez

November 12, 2019

IPv6 VPNs in Fortigate Firewalls

I have two Fortigate 140Es in my environment.  SecPrimate-01 and SecPrimate-02.  The SecPrimate-01 is using the Mariner color while the…

By Manny Fernandez

October 20, 2019

Setting Up Tor On macOS

Tor is an Open-Source project created in the 90's by United States Naval Research Laboratory.  Tor give you a level…

By Manny Fernandez

September 18, 2019

Disabling Weak Ciphers on Fortigate Firewalls

A customer of mine sent me an email after having a vulnerability assessment done against his environment.  He got back…

By Manny Fernandez

April 14, 2019

Using OpenSSL to Provision Wildcard Certificate

I have my lab set up with plenty of gear from Fortinet, Cisco, Palo Alto and Checkpoint. In order to…

By Manny Fernandez

January 3, 2019

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