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Nick Sullivan

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Fighting Fire with Venom: Adversarial Defense Against...USENIX Security '252025-08-13
Venom is an inline reverse proxy (implemented on Cloudflare Workers) that fingerprints requests—headers, TLS fingerprints, IP clusters, request cadence—and…
Talk on
Portunus: Re-imagining Access Control in Distributed SystemsUSENIX ATC '232023-07-10
Portunus applies ciphertext-policy ABE to encrypt TLS private keys under customer-chosen locality policies, issues per-server attribute secret keys from a core…
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Let The Right One In: Attestation as a Usable CAPTCHA AlternativeSOUPS 20222022-08-07
The project implements a Cryptographic Attestation of Personhood built on the WebAuthn standard using commercial secure keys and phone biometrics to produce…
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New Layer One ProtocolsConsensus 20202020-05-11
Cloudflare describes a distributed web gateway that accelerates and caches access to IPFS and Ethereum, plus a hosted API option so companies avoid running…
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Privacy Pass: A Lightweight Zero Knowledge Protocol Designed for the Web2nd ZKProof Workshop 20192019-04-10
Privacy Pass is a lightweight zero-knowledge protocol that implements a batched EC-OPRF with a single DL-equality proof to issue unlinkable redeemable tokens…
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In Search of CurveSwap: Measuring Elliptic Curve Implementations in the WildBlack Hat Europe 20182018-12-03
Internet-wide ZMap scans contact 41 million IPv4 hosts and find 28.8 million supporting ECDH, with 22% of TLS servers reusing ephemeral keys and 8,000+ servers…
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Panel: From Spam to Speech: Policing the Next Generation of "Unwanted Traffic"USENIX Security '182018-08-15
Automated moderation struggles with scale and nuance: off‑the‑shelf NLP averages 56-58% accuracy while tuned models rise to 75-80%, so false…
Panel on
Understanding the Mirai Botnet26th USENIX Security Symposium (USENIX Security '17)2017-08-16
Seven-month measurement combines a network telescope, active scans, telnet honeypots and VirusTotal binaries with passive DNS and C2 monitoring to show Mirai…
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Encryption vs. InspectiondotSecurity 20172017-04-21
Research shows that authorized man‑in‑the‑middle systems including antivirus and corporate proxies measurably reduce TLS security, reintroducing downgrade and…
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