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Matthew Green

Matthew Green

Cryptography professor, Johns Hopkins University

Appears in 1 story

Notable Quotes

"If we judge XChat as an end-to-end encryption scheme, this seems like a pretty game-over type of vulnerability." — Blog post, June 2025

"For the moment, until it gets a full audit by someone reputable, I would not trust this any more than I trust current unencrypted DMs." — To TechCrunch

Stories

X builds toward a Western super app, one standalone product at a time

New Capabilities

Leading academic critic of XChat's encryption architecture

Elon Musk spent $44 billion to buy Twitter in October 2022, telling investors it was 'an accelerant to creating X, the everything app.' Three and a half years later, that app is still taking shape—haltingly. XChat, a standalone end-to-end encrypted messaging app for iPhone and iPad, was announced for April 17, 2026, then quietly delayed to April 23 with no public explanation. The slip was spotted by users who noticed the App Store listing had changed overnight, and it arrived alongside a flood of security criticism that called into question whether X's encryption holds up to scrutiny.

Updated Apr 18