The macOS Keychain attack, Signal’s new private contact discovery service, the Deloitte hack, and a handful of mobile stock trading app vulnerabilities are discussed.

Open Whisper Systems announced that it has added the disappearing messages feature to the Signal encrypted messaging app.

In March when Moxie Marlinspike and Open Whisper Systems released the iOS version of the Signal encrypted messaging app, the noted security researcher promised to expand its reach and among other things, eventually release a desktop version of Signal. That vision was realized on Wednesday with the public availability of the Signal Desktop beta, written...