安全性に定評があるメッセージアプリ・Signalの使用について、アメリカ国家安全保障局(NSA)が職員に対して警告を発してい ...

2025年3月、トランプ政権で国家安全保障問題担当大統領補佐官を務めていたマイケル・ウォルツ氏が、誤ってメッセンジャーアプリ・Signalのグループチャットに民間人を追加してしまい、極秘の軍事作戦を外部に流出させるという事態が発生しました。

Russia is “engaged in a large-scale global attempt” to take over Signal and WhatsApp accounts, two Dutch intelligence agencies said Monday, adding to warnings issued by several groups about the ...

FBI and CISA warn Russian spies targeted Signal users in a phishing campaign that compromised thousands of messaging app accounts.

Dutch intelligence agencies have issued a stark warning regarding a new, highly sophisticated global cyber campaign. Two intelligence agencies in the Netherlands warned earlier this week that ...

In a statement, the department said the app serves as a supplemental communication tool, similar to phone calls, text ...