Tony Arcieri
Cofounder at iqlusion
Denver, Colorado, United States
Summary
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Rockstar🎓
Top SchoolTony Arcieri is a cofounder and cryptography-focused infrastructure engineer with 15 years of experience building secure, production-grade systems from low-level cryptographic primitives to distributed services. Based in Denver, he blends applied cryptography and systems engineering—previously as a Senior InfoSec Engineer at Square and an engineer at Chain—now leading technical direction at iqlusion. A prolific open-source contributor in the Rust ecosystem, his work includes major improvements to widely used projects like curve25519-dalek and ed25519-dalek, plus implementations across block ciphers, AEADs, and elliptic curves. He also brings deep Ruby and systems experience from projects such as Resque and http.rb, and has shipped embedded support for microcontrollers, showing comfort across hardware and software stacks. Notably, Tony has a track record of modernizing codebases for no_std and allocator-constrained environments, demonstrating an uncommon focus on cryptography that runs cleanly in constrained systems.
15 years of coding experience
16 years of employment as a software developer
Computer Science, Computer Science at Colorado State UniversityUniversity of Colorado Boulder
Stackoverflow
165reputation
351kreached
3answers
0questions
Github Skills (94)
ec10
testing10
elliptic-curve10
background-worker10
httpc10
digital-signature10
security10
ruby10
smf10
http-client10
encoding10
embedded10
concurrency10
crypto10
elliptic-curve-cryptography10
Programming languages (30)
Github contributions (5)
RustCrypto/formats
Sep 2021 - Jan 2023
Cryptography-related format encoders/decoders: DER, PEM, PKCS, PKIX
Role in this project:
Back-end Developer
Back-end DeveloperContributions:580 reviews, 500 commits, 1638 PRs in 1 year 4 months
Contributions summary:Tony's commits primarily involve modifying and extending the code within the `rustcrypto/formats` repository. The commits indicate work focused on adding support for various ASN.1 DER-encoded data formats like certificates, improving and expanding capabilities. This involved refactoring code, introducing new types, and refining existing functionality.
cryptographyderpemencoderspkcs
RustCrypto/AEADs
Aug 2019 - Nov 2022
Authenticated Encryption with Associated Data Algorithms: high-level encryption ciphers
Role in this project:Back-end Developer
Back-end DeveloperContributions:100 reviews, 408 commits, 662 PRs in 3 years 3 months
Contributions summary:Tony primarily contributed to the `rustcrypto/aeads` repository by implementing Authenticated Encryption with Associated Data (AEAD) algorithms, specifically ChaCha20Poly1305 and XChaCha20Poly1305. Their work involved integrating external crates like `chacha20` and `poly1305`, refactoring the code for efficiency, and adding support for the XChaCha20Poly1305 variant. They also contributed to the development of AES-GCM-SIV AEAD.
cryptographysecurityhigh-levelcipherscrypto
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