Ryuji Ishiguro
Lead Security Architect at Car IQ Inc.
San Francisco, California, United States
Summary
👤
Senior🎓
Top SchoolRyuji Ishiguro is a Lead Security Architect in San Francisco with nine years of recent experience building privacy-preserving and high-assurance systems across automotive, cloud, and consumer platforms. He brings deep expertise in DRM, platform security, applied cryptography and blockchain, and has repeatedly taken novel crypto protocols from research to production—implementing low-level C crypto libraries, ZKPs with Bulletproofs, and blockchain-backed ledgers. His past work includes architecting Apple’s Digital Car Key and pioneering anonymous credential schemes like EcDAA, plus foundational DRM systems and patents from his long tenure at Sony. Comfortable across full stacks, Ryuji blends cryptographic R&D with hands-on engineering on Android Automotive, mobile apps, and scalable cloud services. Notably, he has implemented complex primitives (pairing functions, VRFs, MLS) from scratch, showing a rare combination of theoretical depth and production-grade optimization.
9 years of coding experience
40 years of employment as a software developer
Master of Science (MSc), Computer Security, Master of Science (MSc), Computer Security at University of Liverpool
Japanese, English
Github Skills (8)
byzantine6
fault5
storage5
key-value4
cryptography3
merkle-tree3
pki2
golang2
Programming languages (3)
Github contributions (5)
yahoo/bftkv
Aug 2017 - Feb 2018
A distributed key-value storage that's tolerant to Byzantine fault.
Contributions:3 commits, 62 pushes in 6 months
faultbyzantinestoragekey-valuedistributed
r2ishiguro/vrf
Jun 2017 - Jul 2018
Contributions:6 pushes, 1 branch, 1 comment in 1 year 1 month
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