Tom says device security depends on both good technology and legal protections, and recommends using a passcode and biometric authentication. Leah describes using her passcode as a fallback, since restarting an iPhone or repeated failed biometric attempts require it. For Breaker, she says sensitive iOS data belongs in Keychain rather than files such as NSUserDefaults, and companies should explain how they handle government data requests.
Leah Culver of Breaker and Tom Sparks of YC Answer Your Questions About Security and Podcasting
Speakers
Leah Culver, Breaker cofounder, and Tom Sparks of Y Combinator answer audience questions about device security, startup practices, cryptocurrency, and podcasting with host Craig.
Leah and Tom describe authentication as a balance between convenience and security, with factors based on what you know, what you have, and what you are. They point out that passwords and devices can be changed, while a compromised fingerprint is harder to replace. Tom recommends password managers and cautions against SMS or phone calls as authentication factors, citing phone number porting attacks.
Tom says YC uses strong passwords, encryption, VPNs, and code reviews, and advises startups to use established authentication standards and security tools instead of inventing their own. Leah agrees, drawing on her work on an early version of OAuth, and says shared standards let large teams check for vulnerabilities. She also highlights product protections such as alerts for new device logins and password changes.
Leah says Breaker helps people find podcasts through social listening activity and popular episodes, and argues that a compelling episode can hook listeners more readily than a show recommendation. She wants podcasting to grow into a destination for high quality storytelling, while noting the industry’s then-estimated $250 million in annual ad revenue. On startup lessons, she stresses careful spending, asking for help, listening to users, and building from their feedback.
Host Craig says interviews need energetic hosting, clear transitions, and editing that keeps listeners engaged; Leah recommends exploring music and audio storytelling, and Craig suggests transcripts to make episodes searchable. For learning security, Tom points to blogs, Hacker News, capture-the-flag exercises, and inexpensive programmable boards, while Leah says mentorship is valuable. They close with Leah’s advice to master familiar tools instead of chasing every new language or framework.
Takeaways
- Use a password manager and a strong passcode, and avoid SMS as a second factor.
- Keep sensitive app data in protected storage and tell users how data requests are handled.
- Build on established authentication standards and automate security checks where practical.
- Talk to users, study their behavior, and use that feedback to guide product decisions.
- For interviews, plan the energy and transitions, then edit and transcribe episodes to improve listening and discovery.
Mentioned in this talk
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What was claimed 11
- previously atLeah Culver previously at
Dropbox
“At my last job at Dropbox”
YouTube Unverified1 source· Talk
- usesTom Sparks uses
1Password
“I'm a big 1Password user”
YouTube Unverified1 source· Talk
- builtLeah Culver built OAuthWorked on the first version
“I worked on the first version of OAuth.”
YouTube Unverified1 source· Talk
- featureTom Sparks: Recommends against using SMS or phone calls as an authentication factor.
“Don't use SMS or phone calls as a factor.”
YouTube Unverified1 source· Talk
- feature
Breaker: Social listening lets users see what others listen to, subscribe to, and like.
“You can see what people are listening to, what they subscribe to, what they're liking”
YouTube Unverified1 source· Talk
- uses
“We use Mixpanel for implicit user testing”
YouTube Unverified1 source· Talk
- uses
“It's a tool called Buglife, and we love it.”
YouTube Unverified1 source· Talk
- foundedLeah Culver founded
Breaker
“That was one of the reasons I started Breaker.”
YouTube Unverified1 source· Talk
- feature
Breaker: Highlights popular podcast episodes based on user listening, likes, and comments.
“We want to highlight good episodes based on users liking, listening to, and commenting on them.”
YouTube Unverified1 source· Talk
- previously atLeah Culver previously at CryptoSeal
“what I did with CryptoSeal when I was there”
YouTube Unverified1 source· Talk
- previously atTom Sparks previously at CryptoSeal
“that was what we tried to address with CryptoSeal”
YouTube Unverified1 source· Talk






