Kazuhiko Minematsu

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Black Hat·37 min

Black Hat
Red Team
Date: 2025
Location: Black Hat

Payload Compromised: Full Key Recovery in Rocket.Chat E2EE

Hayato Kimura · Ryoma Ito · Kazuhiko Minematsu · Takanori Isobe

Engineers explore architecture and security mechanisms for Payload Compromised: Full Key Recovery in Rocket.Chat E2EE.

e2eepayloadcompromised+2

Briefings·33 min

Black Hat
AppSec
Date: Aug 2025
Location: Las Vegas

Practical Attacks on Nostr, a Decentralized Censorship-Resistant Protocol

Hayato Kimura · Ryoma Ito · Kazuhiko Minematsu · Shogo Shiraki · Takanori Isobe

Nostr is an emerging open-source, decentralized social networking protocol with over 1.1 million users—and a critical blind spot in its security design.

privacyopen-sourceauthentication+3