Home Podcasts Root Causes: A PKI and Security Podcast

Root Causes: A PKI and Security Podcast

Tim Callan and Jason Soroko 623 Episodes Jul 24, 2026

Digital certificate industry veterans Tim Callan and Jason Soroko explore issues surrounding digital identity, PKI, and cryptographic connections in today's dynamic computing world. They discuss best practices in digital certificates under pressure from technology trends, new laws, cryptographic advances, and evolving computing architectures. The podcast helps listeners stay current on developments in this essential technology platform and understand the whys and wherefores of popular Public Key Infrastructures.

Episodes

Root Causes 644: Cryptographically Bound Tokens Jul 24, 2026 00:05:05 In our ongoing series on digital identity for agents, we have previous discussed use of certificates for authentication. In this episode we describe how cryptographic proof of possession can enable secure authentication using tokens.

Root Causes 643: Certificates for Stronger Agent Authentication Jul 22, 2026 00:10:49 We survey different strategies for securely authenticating agentic AI, including certificates and SPIFFE. We discuss Zero Trust and the Principle of Least Privileges as applied to agents.

Root Causes 642: Anthropic to Support SPIFFE/SPIRE Jul 20, 2026 00:03:47 Anthropic has announced its intentions to support SPIFFE/SPIRE with the SPIRE server rooted in an "upstream authority," which will require a root private CA rather than allowing self-attestation for agentic AI.

Root Causes 641: What Is SPIRE? Jul 17, 2026 00:05:50 In our episode 640 we defined SPIFFE, which provides digital identity for agentic workloads. In this episode we explain SPIRE (SPIFFE Runtime Environment), the SPIFFE certificate provisioning protocol.

Root Causes 640: What is SPIFFE? Jul 15, 2026 00:04:41 SPIFFE (Secure Production Identity Framework for Everyone) is a standard for digital identity for agentic workloads. In this episode we explain.

Root Causes 639: Fighting Static API Key Spillage Is Like Fighting Gravity Jul 10, 2026 00:08:28 Static API keys are a common security practice. In this episode we discuss the risk of these keys being revealed, including directly by the AIs that use them.

Root Causes 638: Catfishing Jul 8, 2026 00:21:15 Tim shares his very personal experience with would-be catfishers and we talk about how AI is set to change the catfishing attack.

Root Causes 637: Is It Time to Get Rid of EV SSL? Jul 6, 2026 00:10:59 The Baseline Requirements, CT logs, the Bugzilla Bloodbath, shortening certificate lifespans, all these trends serve to enforce a high level of quality and predictability across WebPKI certificates. Nearly twenty years after the introduction of EV SSL, we ask if it has served its purpose and should be retired.

Root Causes 636: The Future of Crypto Agility Jul 2, 2026 00:09:29 Dustin Moody of NIST joins us to talk about the evolution of standardized cryptography beyond the current PQC efforts. Topics include maintaining visibility on cryptography presently in use, 50 years of RSA, and cryptographic heterogeny.

Root Causes 635: Do We Need to Get Rid of ECC? Jun 29, 2026 00:09:33 Bas Westerbaan of Cloudflare joins us to discuss recent information that heightens concerns about Elliptic Curve Cryptography (ECC) and its vulnerability to a cryptographically relevant quantum computer (CRQC). We pose the question do we need to deprecate ECC in advance of our migration to ML-DSA and other PQC algorithms.

Root Causes 634: White House Executive Order Accelerates PQC Deployment Jun 26, 2026 00:12:42 A new Executive Order (EO) moves the deadline for ML-DSA deployment up to 2031. We talk about why this happened and its implications on government, the technology industry, and enterprises around the globe.

Root Causes 633: ETSI PQC Conference Wrap Up Jun 24, 2026 00:16:11 We are freshly returned from the 2026 ETSI PQC Conference. We give a debrief on the conference, including the difference between post quantum cryptography (PQC) and quantum key distribution (QKD), the algorithmic zoo, PQC for blockchain, the Dunning Kruger Effect, and cryptographic Frogger.

Root Causes 632: Gartner Risk and Security 2026 Wrap Up Jun 22, 2026 00:19:55 We recently attended the Gartner Risk and Security conference for 2026, where we observed a great deal of attention on not only AI but also post quantum cryptography (PQC). Join us as we share the key takeaways.

Root Causes 631: Did the Bugzilla Bloodbath Change Anything? Jun 19, 2026 00:13:09 2024 saw a flurry of high profile incidents for public CA, which we named the Bugzilla Bloodbath. We look back to see how the WebPKI has changed as a consequence.

Root Causes 630: The PQC Physicality Crisis Jun 17, 2026 00:06:27 Resource-constrained devices may need to address PQC through real-time, seed-based, key generation. Unfortunately, this leaves the full key exposed very briefly in RAM. The potential consequences of this are far-reaching and scary. We go into the details.

Root Causes 629: Does the Evidence Support Moving PQC Deadlines to 2029? Jun 15, 2026 00:16:12 Sam Jaques of the University of Waterloo returns to discuss his tracking of progress in quantum computers and offer a perspective on moving our PQC deadlines up to 2029.

Root Causes 628: PI-DOS (Prompt Injection-based Denial of Service) Jun 12, 2026 00:09:40 An emerging attack against AIs is to create a significantly complex and recursive prompt that will occupy the AI indefinitely or for a sufficiently long time that it acts as a Denial-of-Service (DoS) attack. We describe how this works.

Root Causes 627: UK vs Apple E2EE Backups Jun 10, 2026 00:05:11 In the latest in our coverage of government versus encryption, the UK issued secret orders to Apple to give it a cryptographic backdoor to Apple's advanced data protection capability for iCloud. Apple responded by eliminating encryption entirely for UK users. We break it down.

Root Causes 626: TLS 1.3 Roadblock Jun 8, 2026 00:10:15 TLS 1.3 is required to take advantage of post quantum cryptography (PQC) algorithms. Yes, we still see a lot of TLS 1.2 or earlier in deployment. We examine why this is the case and what to do about it.

Root Causes 625: AI in 1000 Days - Cyber Defense Jun 5, 2026 00:08:06 Recent revelations about Mythos and its ability to expose vulnerabilities have forced us to rethink basic assumptions about cyber defense. In our "AI in 1000 Days" series, Jason Soroko and I examine the implications of these revelations three years from now. This includes upping the overall pace of attack and changes to best practices in cyber security defense.

Root Causes 624: Implications of Mythos Jun 3, 2026 00:15:57 Anthropic has delayed its widespread release of Mythos to give major software providers a chance to close off the many vulnerabilities it has discovered. We dig into the vast implications of Mythos and other AI models for the future of cybersecurity.

Root Causes 623: Are PQC Key Sized Big Enough? Jun 1, 2026 00:08:25 We discuss the possibility that our standardized ML-DSA keys turn out to be too short for true confidence, why that might occur, and the implications for private PKI certificates.

Root Causes 622: Modeling the Time to CRQC May 29, 2026 00:15:31 Sam Jaques joins us to explain his much-referenced chart mapping progress toward cryptographically relevant quantum computing (CRQC).

Root Causes 621: Simplicity at Scale May 26, 2026 00:05:11 We break down the phrase "Simplicity at Scale" to see what it means to us in the context of CAs and CLM.

Root Causes 620: Will NIST Update Its PQC Timelines? May 22, 2026 00:09:27 A few years ago NIST proposed deadlines for PQC deployment at 2030 and 2035. But recent announcements from Google and Cloudflare suggest 2029 as a better deprecation target. We are joined by Dustin Moody to get the NIST perspective on these announcements.

Root Causes 619: Do We All Need to Adopt PQC by 2029? May 18, 2026 00:17:02 Recent announcements from Google and Cloudflare have declared new 2029 deadlines for full post quantum cryptography (PQC) migration. Bas Westerbaan explains the rationale behind Cloudflare's decision and discusses implications for other enterprises, asking "Are you a gambler?"

Root Causes 618: MTC and Private PKI May 15, 2026 00:16:13 Repeat guest Bas Westerbaan of Cloudflare joins us to explore the role of Merkle Tree Certificates in private CA scenarios with an eye toward where they will be needed and where traditional PKI will be better suited.

Root Causes 617: What Are X9 Certificates? May 13, 2026 00:21:32 The US-based X9 financial industry consortium has created a server certificate. We explain what X9 certificates are and suitable use cases for this certificate type.

Root Causes 616: NIST and Merkle Tree Certificates May 11, 2026 00:06:51 Dustin Moody of NIST joins us to discuss Merkle Tree Certificates (MTC) and the NIST position on them.

Root Causes 615: What Is IETF PLANTS? May 8, 2026 00:06:34 Repeat guest Bas Westerbaan of Cloudflare joins us to explain the PLANTS working group in IETF, which is driving standards around post quantum cryptography (PQC) and Merkle Tree Certificates (MTC). Bas explains the path to becoming a final standard, where we are in this process, and how you can get involved.

Root Causes 614: MTC and Downgrade Attacks May 6, 2026 00:12:12 It's reasonable to believe that Merkle Tree Certificates (MTC) and traditional RSA will co-exist on the same servers for years, if not decades, during the transition to post quantum cryptography (PQC). Bas Westerbaan of Cloudflare joins us in this episode to explore the possibility of quantum downgrade attacks and what we can do about them.

Root Causes 613: Status of the NIST PQC Contests May 4, 2026 00:22:34 We are joined by Dustin Moody of NIST to go over the current state of the various post quantum cryptography (PQC) contests, including upcoming FIPS standards for Falcon (FN-DSA) and HQC, other Round 4 algorithms, the digital signing algorithm (DSA) On Ramp, isogeny, and future cryptographic exploration.

Root Causes 612: What Do Subscribers Need for MTC? May 1, 2026 00:12:43 We are joined by Bas Westerbaan of Cloudflare to explain considerations and requirements for use of Merkle Tree Certificates (MTC). This includes full adoption of TLS 1.3, offering PQC and RSA at the same time, the imperative value of automation, and running production MTC in 2027.

Root Causes 611: Merkle Tree Certificates, What and Why Apr 29, 2026 00:23:37 There are strong reasons to believe that the architecture of PQC TLS will take the form of Merkle Tree Certificates (MTC). We are joined by post quantum cryptography expert Bas Westerbaan of Cloudflare as he explains this new PKI architecture, how it works, and why we need it. We define new concepts like landmark certificates and log mirrors and discuss what's necessary to move to this new archite

Root Causes 610: Types of Logical Qubits Apr 27, 2026 00:10:01 We describe three different kinds of logical qubits with their relative strengths and weaknesses.

Root Causes 609: Side Channel Apocalypse Apr 24, 2026 00:06:49 Jason explains the extreme danger of side channel attacks in the new post quantum cryptography (PQC) era.

Root Causes 608: The Fragility of Formal Verification Apr 22, 2026 00:07:51 The reliability of cryptographic algorithms is largely a matter of conjecture based on track record. Proving security is impaired by the difficulty of formal verification, implementation weaknesses, and failure in randomness.

Root Causes 607: PKI That's Hard to Discover Apr 20, 2026 00:07:59 The first of the five pillars of Certificate Lifecycle Management (CLM) is discovery. While many of your certificates are easily discoverable, some difficult PKI remains.

Root Causes 606: What Is the UK Online Safety Act? Apr 17, 2026 00:06:10 The UK Online Safety Act intends to force vendors who sell hardware and software to allow the government to scan end-to-end encrypted communication on end devices. We once again marvel at governments seeking to undermine the security of their own citizens.

Root Causes 605: Chrome Declares Its Support for Merkle Tree Certificates (MTC) Apr 15, 2026 00:09:17 Google has taken a strong position supporting Merkle Tree Certificates (MTC) as the PQC-enabled future for SSL / TLS. We unpack this extremely important position from the WebPKI's most influential organization.

Root Causes 604: Accelerated Timeline for Quantum Computers Breaking ECC in Crypto and Blockchain Apr 13, 2026 00:11:09 A new paper from Google Quantum AI and others documents a new technique for breaking ECC, particularly the curve protecting crypto currencies, smart contracts, and blockchain. This accelerates post quantum cryptography (PQC) timelines.

Root Causes 603: Cryptographically Relevant Quantum Computing (CRQC) with Only 10,000 Qubits Apr 10, 2026 00:09:26 New research suggests that a cryptographically relevant quantum computer is achievable with only 10,000 qubits. This was an important contributor to Google moving its PQC target to 2029.

Root Causes 602: Google Moves the PQC Date Forward to 2029 Apr 8, 2026 00:12:59 Google has announced that it is moving its target for full PQC support to 2029. This is a strong statement from one of the most knowledgeable PQC technology companies that the existing 2030 target is too late.

Root Causes 601: The Zombie in the Server Room Apr 6, 2026 00:06:50 Legacy PKI implementations in the enterprise are holding back technical progress and creating security risk. We discuss reasons why, consequences, and what to do about it.

Root Causes 600: Cryptographic Design Is Not Neutral Apr 3, 2026 00:10:19 In our previous episode we defined cryptography as the new geopolitics. Now in our 600th episode we follow up to explain how all cryptographic decisions reflect the social, political, and legal viewpoints of the cryptography's designers.

Root Causes 599: Cryptography Is the New Geopolitics Apr 1, 2026 00:10:39 In the last decade or so, nations around the world have become keenly determined to use cryptography for their own legal, economic, and military advantage. We explore this concept.

Root Causes 598: Why Johnny Can't authN in OT Mar 30, 2026 00:07:55 A recent CISA report declares that the nation's OT infrastructure is incapable of keeping up with the crypto agility and certificate management needs that modern security demands. We examine this finding.

Root Causes 597: If You Don't Hold the Keys, You Don't Hold the Subpoenas Mar 27, 2026 00:07:26 Microsoft has publicly stated that it will hand over Bitlocker keys to US law enforcement agencies without requiring a subpoena or court order. These keys can be held by users rather than Microsoft, at their option. We dive into this topic.

Root Causes 596: CLM and Operational Uptime Mar 25, 2026 00:06:43 We usually think of Certificate Lifecycle Management (CLM) as a security category. But we could equally well categorize it as an operations category that enables uptime. In this episode we make our case.

Root Causes 595: What Is a Digital Parasite? Mar 23, 2026 00:12:30 We introduce the concept of a "digital parasite," explaining why this attack philosophy appears to be on the rise.

Root Causes 594: Google's Five PQC Recommendations for Policy Makers Mar 18, 2026 00:16:57 In a recent blog post Google made five recommendations for policy makers. We walk down the list.

Root Causes 593: New PQC Guidance from CISA Mar 16, 2026 00:16:57 CISA (Cybersecurity and Infrastructure Security Agency) has released new guidance about post-quantum cryptography in critical infrastructure, including some very sobering warnings. We go into the details.

Root Causes 592: When a CAA Record Outlives the CA Mar 13, 2026 00:08:44 CAA records exist to restrict issuing CAs for a given domain to as few as one CA. But what happens when the CAA record outlives the CA to which it restricts issuance? Join us to find out.

Root Causes 591: Client Authentication Deprecation Date Moves Out Mar 11, 2026 00:11:46 Chrome's deadline for deprecation of the clientAuth EKU and mTLS in public certificates has moved out. We give you the what, when, and why.

Root Causes 590: The Size of the CA Is Not the Size of the Risk Mar 10, 2026 00:07:19 It would be easy to believe that the amount of risk posed to the WebPKI by any individual public CA is somehow proportional to the number of active certificates that CA has. This is false, however. In this episode we address this misconception.

Root Causes 589: Is a Cryptographically Relevant Quantum Computer Economically Viable? Mar 6, 2026 00:09:35 We recently heard the argument that it's simply too expensive to develop a cryptographically relevant quantum computer. We vehemently disagree. In this episode we explain why.

Root Causes 588: It's Cryptographic Frogger from Here on Out Mar 4, 2026 00:09:55 In this episode Tim explains that the transition to PQC is not just a change in cryptographic algorithms but also a fundamental shift in how we treat our cryptography. From here on out, IT systems need to be fundamentally crypto agile in a way we've never had to be before. Cryptographic Agility is the key to solve this problem.

Root Causes 587: AI Orchestration for Attackers Mar 2, 2026 00:10:55 YouTube video version of this episode https://youtu.be/-wMy3rPV1Lg

Root Causes 586: Beyond Harvest Now Decrypt Later Feb 27, 2026 00:08:39 We expand on the concept of trust-now-forge-later to list a whole bevy of additional attacks that eventually will be enabled by cryptographically relevant quantum computers.

Root Causes 585: The Cryptographic Inventory Manifesto Feb 25, 2026 00:08:54 We all love a good manifesto! Jason spells out the ten principles of the Cryptographic Inventory Manifesto, and we discuss.

Root Causes 584: Mapping DORA to CLM Feb 23, 2026 00:20:38 We look at the new European DORA and NIS2 regulations and how Certificate Lifecycle Management is a key requirement to meet these requirements. You will be surprised how explicit these requirements are.

Root Causes 583: AI Versus ECC P 256 Feb 20, 2026 00:10:51 Recorded in Ottawa Ontario.

Root Causes 582: New Research Drastically Cuts Number of Qubits for Cryptographic Relevance Feb 17, 2026 00:14:11 New research indicates that the number of qubits necessary to achieve cryptographic relevance has reduced by two orders of magnitude. We cover this breaking news and its implications.

Root Causes 581: A Timeline for Deprecation of Manual DCV Methods Feb 15, 2026 00:13:09 By CABF ballot all manual methods of Domain Control Validation (DCV) will be deprecated by 2028. We explain which methods are due for deprecation and when.

Root Causes 580: Top Use Cases for Hybrid Certificates Feb 13, 2026 00:12:47 We go over the qualities in abstract of a use case that strongly invites the use of hybrid certificates and then run down a list of specific use cases that meet these criteria. This includes OT systems, code signing, secure boot, WiFi, enterprise S/MIME, and more.

Root Causes 579: Make Cryptography Boring Again Feb 10, 2026 00:17:44 In this episode Jason declares that we must make cryptography boring again. We get into what that means and why it matters.

Root Causes 578: 200 Days Won't Actually Be 200 Days Feb 9, 2026 00:10:10 We have seen much talk of the upcoming drop of maximum TLS term to 200 days, followed by 100 days, and eventually down to 47 days. It happens that all those numbers are too large and the actual maxima will be less than that. We explain.

Root Causes 577: All the Stuff That's Coming in March Feb 6, 2026 00:10:05 March 2026 is due to be the most eventful month in the history of the WebPKI. Join us as we go over all the many changes coming next month.

Root Causes 576: Jeffries Dumps Bitcoin Due to the Quantum Threat Feb 4, 2026 00:06:51 A large investment firm divests from Bitcoin for fear of the quantum threat.

Root Causes 575: Shortening Certificate Term - All the Dates Feb 2, 2026 00:20:49 Everybody knows about March 15 and the drop in maximum public TLS certificate term to 200 days. But that only scratches the surface on key dates with this maximum term reduction. Join us as we go over "all the dates" for TLS maximum term reduction.

Root Causes 574: 2025 Predictions Scorecard - Part 2 Jan 30, 2026 00:19:33 We score our 2025 predictions in this second of two parts.

Root Causes 573: 2025 Predictions Scorecard - Part 1 Jan 28, 2026 00:23:19 Every new year we make predictions for the year to come, and every year we go back and see how we did. This is the first of two parts scoring our 2025 predictions.

Root Causes 572: Quality of Entropy Jan 26, 2026 00:08:44 We discuss the idea that not all cryptographic entropy is equally "random" and potential consequences.

Root Causes 571: Will There Ever Be a Cryptographically Relevant Quantum Computer? Jan 23, 2026 00:09:16 We discuss the idea that it might be impossible to actually create a cryptographically relevant quantum computer and weigh in on this idea.

Root Causes 570: PQC Readiness at the Boardroom Level Jan 21, 2026 00:12:09 Repeat guest Chris McGrath shares what enterprises need to be doing now to stay on track for the NIST PQC deadline in 2030.

Root Causes 569: New Regulations Are Changing the PKI Landscape Jan 19, 2026 00:09:58 Repeat guest Chris McGrath joins us to discuss how increasingly strict regulations are requiring increased rigor, visibility, and auditability for enterprise digital certificates and PKI.

Root Causes 568: Upping Your Certificate Game for Better Security Jan 16, 2026 00:12:35 Senior cyber security advisor Chris McGrath joins us to discuss redefining digital certificates and their role in your organizational security profile, increasing regulation of certificates, and how enterprises can up their certificate game.

Root Causes 567: Top 10 PQC Laggards in the Enterprise Jan 14, 2026 00:20:44 We name the ten enterprise environments and use cases that are most likely to be late adopters of post quantum cryptography (PQC).

Root Causes 566: Time Is a Security Primitive Jan 12, 2026 00:12:18 We discuss the foundational importance of time in PKI and security in general. This includes when things happen, the order in which things happen, and attacks based on time-spoofing. We drill down on certificates, roots, timestamping, Certificate Transparency, patching, audits, and PQC.

Root Causes 565: Our Response to QWAC Arguments - Part 3 Jan 8, 2026 00:11:36 In our concluding episode on the topic, we scrutinize arguments made for and against QWACs, this time focused on "compliance and interoperability."

Root Causes: A PKI and Security Podcast

Episodes

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