6 citations · 19 across the 11 of their papers we have counts for
12 papers
STAR: Scalable TEE-based Anonymous Rate-limiter
Kosei Akama, Yoshimichi Nakatsuka, Koichi Moriyama +1
Protecting Internet services from attacks such as TLS/HTTP floods requires rate limiting, yet identifying users to enforce these limits can compromise their privacy. Anonymous rate…
Credential Disclosure in (EU) Digital Identity Wallets: Privacy Risks and Practical Mitigations
Sheila Zingg, Daniele Lain, Yoshimichi Nakatsuka +3
The European Union will introduce the EUDI Wallet by late 2026, which allows users to hold digital credentials (i.e., representations of physical official identity documents) on th…
Gyokuro: Source-assisted Private Membership Testing using Trusted Execution Environments
Yoshimichi Nakatsuka, Nicolas Dutly, Kari Kostiainen +1
Private Membership Testing (PMT) protocols enable clients to verify whether a certain data item is included in a database without revealing the item to the database operator or oth…
URL Inspection Tasks: Helping Users Detect Phishing Links in Emails
Daniele Lain, Yoshimichi Nakatsuka, Kari Kostiainen +2
The most widespread type of phishing attack involves email messages with links pointing to malicious content. Despite user training and the use of detection techniques, these attac…
RA-WEBs: Remote Attestation for WEB services
Kosei Akama, Yoshimichi Nakatsuka, Korry Luke +2
Data theft and leakage, caused by external adversaries and insiders, demonstrate the need for protecting user data. Trusted Execution Environments (TEEs) offer a promising solution…
Puppy: A Publicly Verifiable Watermarking Protocol
Devriş İşler, Seoyeon Hwang, Yoshimichi Nakatsuka +2
In this paper, we propose Puppy, the first formally defined framework for converting any symmetric watermarking into a publicly verifiable one. Puppy allows anyone to verify a wate…
Scrappy: SeCure Rate Assuring Protocol with PrivacY
Kosei Akama, Yoshimichi Nakatsuka, Masaaki Sato +1
Preventing abusive activities caused by adversaries accessing online services at a rate exceeding that expected by websites has become an ever-increasing problem. CAPTCHAs and SMS…
CTR: Checkpoint, Transfer, and Restore for Secure Enclaves
Yoshimichi Nakatsuka, Ercan Ozturk, Alex Shamis +2
Hardware-based Trusted Execution Environments (TEEs) are becoming increasingly prevalent in cloud computing, forming the basis for confidential computing. However, the security goa…
Vronicle: A System for Producing Videos with Verifiable Provenance
Yuxin, Liu, Yoshimichi Nakatsuka +3
Demonstrating the veracity of videos is a longstanding problem that has recently become more urgent and acute. It is extremely hard to accurately detect manipulated videos using co…
VICEROY: GDPR-/CCPA-compliant Enforcement of Verifiable Accountless Consumer Requests
Scott Jordan, Yoshimichi Nakatsuka, Ercan Ozturk +2
Recent data protection regulations (such as GDPR and CCPA) grant consumers various rights, including the right to access, modify or delete any personal information collected about…
CACTI: Captcha Avoidance via Client-side TEE Integration
Yoshimichi Nakatsuka, Ercan Ozturk, Andrew Paverd +1
Preventing abuse of web services by bots is an increasingly important problem, as abusive activities grow in both volume and variety. CAPTCHAs are the most common way for thwarting…
PDoT: Private DNS-over-TLS with TEE Support
Yoshimichi Nakatsuka, Andrew Paverd, Gene Tsudik
Security and privacy of the Internet Domain Name System (DNS) have been longstanding concerns. Recently, there is a trend to protect DNS traffic using Transport Layer Security (TLS…