Featured Contributor
Tim Callan
Chief Compliance Officer at Sectigo
As Chief Experience Officer, Tim Callan leads efforts to optimize the customer journey across all aspects of the business. Tim has more than 20 years of experience as a strategic marketing and product leader for successful B2B software and SaaS companies, with 15 years of experience in the SSL and PKI technology spaces.
Tim Callan has over 20 years of experience in the SSL and PKI technology spaces. Tim leads Sectigo's conformance with industry and regulatory requirements including browser root programs, WebTrust, CA/Browser Forum, and more. Tim is instrumental in driving initiatives to improve certificate agility and successful issuance. A founding member of the CA/Browser Forum and current vice-chair for one of its working groups, Tim is creator and co-host of Root Causes: A PKI and Security Podcast, the world’s most popular podcast dedicated to digital certificates. With 400+ episodes published, Tim is on the forefront of explaining trends that will be essential to the IT professionals, including shortening certificate lifespans and the coming change to post-quantum cryptography.
Recent Posts from Tim Callan
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A live webinar hosted by Sectigo.
60 minutes
Webinars UpcomingWhy choosing a reputable CA is crucial in a 47-day world
Join our webinar to explore why selecting a reputable CA is more critical than ever to avoiding downtime and keeping your business compliant.
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EPISODE 504
Broadcast Date:
June 10, 202518 minutes
Podcasts Jun 10, 2025Root Causes 504: Jason Programs a Quantum Computer
Jason describes his recent experience using Amazon Braket.
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60 minutes
Webinars Jun 04, 2025Why 47-day certificate lifespans demand smarter investment
As digital certificate lifespans shrink to just 47 days, the urgency to automate isn’t just a security concern—it’s a financial one. Join our upcoming webinar to uncover the true cost of manual certificate management and see how automation can deliver real, measurable ROI. We’ll show you how to use the Sectigo ROI calculator, helping you quantify savings in time, labor, and downtime risk. Whether you're building a business case or looking to justify investment, this session will equip you with the insights and tools you need to make smarter, faster decisions.
- The true costs of manual certificate management
- The ROI of automation: What changes when you automate
- How to quantify your ROI with Sectigo’s ROI calculator
- Making the case: How to build the business argument to align with your IT, security, and executive priorities
- Taking action in time for 47 days
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EPISODE 502
Broadcast Date:
June 4, 202511 minutes
Podcasts Jun 04, 2025Root Causes 502: The PQC Game of Chicken
In this episode Jason explains the fallacy of "playing chicken" with the Quantum Apocalypse. We discuss stack ranking and "eyes open" PQC risk decisions.
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EPISODE 501
Broadcast Date:
June 2, 20254 minutes
Podcasts Jun 02, 2025Root Causes 501: Why Increasing RSA Key Size Won't Solve the Quantum P
In this brief episode we explain why the problem that Shor's Algorithm poses to RSA and ECC can't be solved simply by increasing key size.
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EPISODE 500
Broadcast Date:
May 30, 202521 minutes
Podcasts May 30, 2025Root Causes 500: OMG! 500 Episodes of Root Causes!
Wow. It's episode 500 of Root Causes. Jason and Tim talk about how the podcast has evolved in the past six years, how it has remained consistent, and the updates we're making to keep being a valuable resource for our listeners.
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EPISODE 499
Broadcast Date:
May 27, 20259 minutes
Podcasts May 27, 2025Root Causes 499: Don't Blame Signal
The recent Signal controversy highlights the importance of understanding what protections an E2EE messaging app provides, and what it does not.
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EPISODE 498
Broadcast Date:
May 23, 202515 minutes
Podcasts May 23, 2025Root Causes 498: UK NCSC PQC Guidance
The UK National Cyber Security Centre (NCSC) has released new PQC guidance. We take exception to the dates it gives and explain why.
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EPISODE 497
Broadcast Date:
May 21, 202520 minutes
Podcasts May 21, 2025Root Causes 497: PQC Update with Sofia Celi
Guest Sofia Celi (IETF, Brave) returns to talk about important developments in post quantum cryptography. Sofia tells us about her candidate algorithm MAYO and what is happening with the NIST PQC onramp. We learn about KEM TLS and the status of PQC initiatives in IETF.