hemant chaskar

CTS 096: Deep Dive into KRACK with Hemant Chaskar

Hemant Chaskar, VP of Technology and CISO of Mojo Networks, joins the podcast to talk about the technical details around KRACK.

Title image for CTS 096

Hemant Chaskar On KRACK

Let’s welcome Hemant Chaskar of Mojo Networks.

Hemant Chaskar is a Vice President and CISO at Mojo Networks. His past work has spanned wireless, networking and security, with the recent 12 years in enterprise WiFi as technology expert, product designer and technical evangelist. At Mojo, he has been spearheading the development of access, intrusion prevention and cloud based WiFi solutions.

Mojo Networks is a provider of enterprise cloud managed WiFi solution, with a vision to create networks that reach new heights in performance, security, scalability, and ease-of-use. It strives to liberate networks from proprietary hardware and utilize the full power of the cloud to deliver Cognitive WiFi: a self-driving network that makes things remarkably simple and reliable at massive scale.

This episode gets very technical as François and Hemant go into the details of how KRACK works by starting from the beginning..

What exactly is in this episode?

  • Review of WPA2 crypto
  • CCM
  • Review of AES-CTR
  • What is an AES-CTR Nonce
  • What is a nonce?
  • How does GCM differ from CCM
  • Attacking the EAPOL 4-Way Handshake
    • EAPOL overview
    • Impact
    • Severity
    • Countermeasures
  • Attacking Group Key Handshake
  • Attacking 802.11r FT Handshake
  • Lessons learned

Links and Resources

CTS 072: Guide to Using External Antennas

Why should you use external antennas in your Wi-Fi environment? There are many reasons you should use them. In this episode, we talk about what to look for in external antennas, what to watch out for when deploying them, and what details to keep in mind.

We are used to internal antennas from our access points. Have you considered using external antennas to meet your Wi-Fi requirements? In this episode, we provide some educational material around external antennas. Yes, they do add some cost to a project but it’s not much compared to the solution they bring to your Wi-Fi network. There are use cases for external antennas and below are the topics we talk about during the episode.

This episode is proudly sponsored by AccelTex Solutions. They are providing a special offer just for our listeners. If you head over to their products page and use promo code CTS Podcast 72 they will send you a free antenna sample of your choice.

AccelTex Solutions

Episode Contents

  • Why use antennas, other than the ones built into the AP?
    • Aesthetics
    • Direct signal
    • To meet requirements
    • Use outdoor
  • Antenna types
    • Omni
      • Signal in 360 degrees
    • Semi-directional
      • Ranges in degrees such as 65 degrees, 120 degrees, etc
      • Patch
    • Directional
      • Dish
      • Yagi
  • Antenna details
    • Beamwidth
    • Azimuth and elevation pattern
      • Lobes
    • Gain
      • Passive
    • Connectors
      • RPTNC
      • RPSMA
    • Elements
      • Isolation
        • Antennas hearing each other
      • Horizontal
      • Vertical
    • Orientation
    • Antenna Polarization
      • Important for indoors?
        • MIMO
      • Outdoor PtP links
  • Design
    • When designing Wi-Fi be sure to use the right antennas
  • Deployment
    • Mount the antennas properly
    • Get the right angle
    • Consider spacing between antennas
    • Don’t connect two antennas to one access point, unless you’re using something like a DART connector on the Cisco 3802E
  • Personal experience
    • High density
    • Outdoor
    • Special use cases
Sample Radiation Pattern for AccelTex ATS-OP-245-47-6RPSP-36

Sample Radiation Pattern for AccelTex ATS-OP-245-47-6RPSP-36


RF Elements Antenna Propagation Patterns

RF Elements Antenna Propagation Patterns


Meraki MR53 2.4 GHz antenna pattern

Meraki MR53 2.4 GHz antenna pattern

Links and Resources

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