Papers

Publications

• Interoperable Symmetric Message Franking
  Carolina Ortega Pérez, Thomas Ristenpart, Julia Len
  CCS 2025

• The OCH Authenticated Encryption Scheme
  Sanketh Menda, Mihir Bellare, Viet Tung Hoang, Julia Len, Thomas Ristenpart
  CCS 2025
  🏆   Distinguished Paper Award

• Designing Secure-By-Default Cryptography for Computer Systems
  Julia Len
  PhD Dissertation 2024

• OPTIKS: An Optimized Key Transparency System
  Julia Len, Melissa Chase, Esha Ghosh, Kim Laine, Radames Cruz Moreno
  USENIX Security 2024

• ELEKTRA: Efficient Lightweight multi-dEvice Key TRAnsparency
  Julia Len, Melissa Chase, Esha Ghosh, Daniel Jost, Balachandar Kesavan, Antonio Marcedone
  CCS 2023

• Context Discovery and Commitment Attacks: How to Break CCM, EAX, SIV, and More
  Sanketh Menda, Julia Len, Paul Grubbs, Thomas Ristenpart
  Eurocrypt 2023

• Authenticated Encryption with Key Identification
  Julia Len, Paul Grubbs, Thomas Ristenpart
  Asiacrypt 2022

• Orca: Blocklisting in Sender-Anonymous Messaging
  Nirvan Tyagi, Julia Len, Ian Miers, Thomas Ristenpart
  USENIX Security 2022

• Fuzzy Message Detection
  Gabrielle Beck, Julia Len, Ian Miers, Matthew Green
  CCS 2021

• Partitioning Oracle Attacks
  Julia Len, Paul Grubbs, Thomas Ristenpart
  USENIX Security 2021

• Asymmetric Message Franking: Content Moderation for Metadata-Private End-to-End Encryption
  Nirvan Tyagi, Paul Grubbs, Julia Len, Ian Miers, and Thomas Ristenpart
  Crypto 2019    [code]

• Better Than Advertised: Improved Collision-Resistance Guarantees for MD-Based Hash Functions
  Mihir Bellare, Joseph Jaeger, Julia Len
  CCS 2017

Preprints

• Interoperability in End-to-End Encrypted Messaging
  Julia Len, Esha Ghosh, Paul Grubbs, Paul Rösler