• Telecommunications Consulting

    Telecommunications Consulting

    Consulting Services from Network Design to Project Management Read More
  • Internetworking Training Experts

    Internetworking Training Experts

    Click on Training and then Courses. Read More
  • Wireshark Experts

    Wireshark Experts

    Packet analysis expertise is critical in today's networks, and being able to use the best packet analyzer application is a skill we can help you and your team attain. Read More
  • Are you a Network Scientist?

    Are you a Network Scientist?

    Online Learning, Instructor Led in person or Web-based delivery. Check out our online school. Read More
  • Online Certification Training

    Online Certification Training

    Find out about our Network Self Certification Program for Rural Service Providers here! Read More
  • IPv6 Experts

    IPv6 Experts

    Along with other Internet regions, ARIN is out of IPv4 Addresses. Are you IPv6 fluent? Are you IPv6 ready? Read More
  • Enabling the IoT with Wireless

    Enabling the IoT with Wireless

    Without wireless, we cannot have the Internet of Things. Read More
  • MPLS Book for iPad and iPhone

    MPLS Book for iPad and iPhone

    Get Mr. Walding's book here! Read More
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8

Welcome to CellStream, Inc. - Telecom Consulting and Training!

Welcome to our home on the Internet, where we can not only share information, but also interact with each other.

If you are a visitor to the site, there are a number of things to view:

Registered CellStream folks and our clients will log in using their private credentials to access projects, calendars and discussions.

Thanks for visiting! We always welcome comments and suggestions.

The CellStream Team

I am often asked how SSL and TLS can be decrypted in Wireshark captures.  The procedure/experiment below will allow you to uncover this process and practice it using a capture provided and SSL/TLS keys - also provided.

Let's start by first downloading a ZIP file here.  I suggest unzipping this to your desktop, as all procedures below are illustrated that way.

Assuming you have done so, you will have the following three files:

Screen Shot 2017 07 15 at 10.35.58 AM

Step 1: Open the .pcapng File

If you have Wireshark installed, you should simply be able to double click it.  The Wireshark screen should look like this if you are in the default profile:

Screen Shot 2017 07 15 at 10.41.15 AM

A little note:  We have the TRANSUM plugin enabled.  It is not necessary, so do not worry about the TRANSUM information.

A quick study of the capture reveals TCP and the content is encrypted.  So we have no real idea of what is going on.  Looking at packet #4:

Screen Shot 2017 07 15 at 10.44.41 AM

By the way the Random field is part of the TLS key!

You also see that packet 11 is just application data and we have no idea what it is.

Step 2: Using the SSL Key

To unlock this capture, we need two things:  the SSL key, and the TLS key.

We begin by configuring the SSL Key.

Go to Wireshark> Preferences on a MAC or Edit> Preferences on a Windows machine.  With either you will get the following screen:

Screen Shot 2017 07 15 at 10.48.20 AM

Now select the Protocols, and scroll down to the SSL Protocol:

Screen Shot 2017 07 15 at 10.49.44 AM

Next, click the Edit button next to RSA Keys list.  The following pop up will appear:

Screen Shot 2017 07 15 at 10.51.14 AM

This screen allows you to configure multiple keys.  The cool thing is that Wireshark will use whatever key works!

Click the "+" sign to add a new key, and enter the information as shown (the system will begin expecting the IP Address, then tab to the Port and Protocol fields; you have to click the area just below the Key File to open the file navigation and ofcourse you will select TheSSL.key file that was unzipped to your desktop):

Screen Shot 2017 07 15 at 10.54.18 AM

Click OK.

Step 3: Adding the TLS Key

Now, select the browse button to configure the Master Secret log filename (TheTLS.key that should be on your desktop):

Screen Shot 2017 07 15 at 10.59.24 AM

Click the OK button.

At this point the display in Wireshark is going to change:

Screen Shot 2017 07 15 at 11.01.39 AM

Now we see that packet 11, for instance, is actually OpenFlow, and Wireshark has been able to dissect the protocol.


You have successfully configured Wireshark to decrypt SSL and TLS.

Anything you would add?


Our Latest Content

  • How Support Should Not Happen

    The term "Support" can be used as a noun or a verb.  To the right is the definition we found

    Read More
  • Is there a lot of QUIC in your Packet Captures?

    Have you noticed a lot of QUIC protocol in your packet captures?  I certainly have, and we had better talk

    Read More
  • Using Wireshark to Analyze QUIC Traffic

    As explained in our prior article on QUIC, you may be seeing a lot of QUIC traffic in your packet

    Read More
  • T-Shark Use in Wireless Networking

    As those who have studied our Wireless Profile (available from the Profile Repository) know, there are a number of great

    Read More
  • Perhaps a top 15 Wireshark Capture Filter List

    Perhaps.... Of course you can edit these with appropriate addresses and numbers. The ones used are just examples.  Unlike Wireshark's

    Read More
  • 1
  • 2
  • 3
  • 4

Our Most Popular Articles

  • What is the 'arp' command, and how can I use it?

    ARP stands for Address Resolution Protocol.  This protocol is used by network nodes to match IP addresses to MAC addresses. 

    Read More
  • IPv6 Windows Command Line Examples

    Here are some great Windows command line entries you can make to examine and configure IPv6 (assuming your version of

    Read More
  • How do I reset my "Default" profile in Wireshark?

    This is a commonly asked question that usually results from users learning the can have different profiles after they have

    Read More
  • Neighbor Discovery (ND) Table in IPv6 Windows, Linux and MAC Machines

    A great question I was asked in class was: "If Neighbor Discovery processes have replaced ARP in ICMPv6, how do

    Read More
  • A List of Network Monitoring Tools for Network and System Administrators

    Monitoring, analyzing, and diagraming a network can often be a huge problem for Network and System Administrators.  They are often

    Read More
  • 1
  • 2
  • 3
  • 4

Subscribe to our Newsletter!

Our Tag Cloud

4G Networks 6LoWLAN 6LoWPAN 802.11 802.11ah 802.11ax 802.11ay 802.11az Addressing Airlines Analysis Ansible Apple Architecture ARP Articles Associations ATM AToM Authoring Bandwidth BGP Billing Bloom's Taxonomy Bluehost BPF Briefings Cable Capture Filter CellStream Cellular Central Office Cheat Sheet Chrome Cisco Click Model Cloud Computer Consulting Crowd Funding Data Center Data Networking Decryption Design DHCPv6 dig Display Filter DNS Documentation Early Adopter Ethernet Ethics Filter Fragmentation G-MPLS GNS3 Google Graphics Hands-On Hiring History Home Network HTTPS ICMP ICMPv6 IEEE 802.11p IEEE 802.15.4 Illustration Image Size Internet IoT IPv4 IPv6 IS-IS L2VPN L3VPN LDP Linux LLN M-BGP MAC Macro Management mergecap Microsoft mininet Monitoring MPLS Multicast Netcat NetMon netsh Networking News nmap NMS nslookup Online School OpenFlow OSPF OSPFv2 OSPFv3 OSX OTT PDF Personnel Planning Policy POTS POTS to Pipes PPP Preview Privacy Profile Project Management PW3E QoS QUIC Remote Desktop Requirements RFI RFP RFQ RIP Routig Routing RPL RSVP Rural Scanning SDN Security Sensor Service Provider Small Business Solutions Brainstorming SONET Spam Speed SS7 SSL Subnetting Support SWOT T-Shark TCP TCP/IP Teamwork Technology Telco Telecom 101 Telecommunications Terminal TLS Tools TR-069 Traffic Engineering Training TRANSUM Travel Tunnel Ubuntu Utility Video Virtualization VoIP VRF WAVE Wi-Fi Windows Wireless Wireless 5G Wireshark WLAN ZigBee

Our Twitter Feed