Dutch intelligence agencies AIVD and MIVD have warned of a large-scale Russian cyber campaign targeting Signal and WhatsApp accounts of government officials, journalists, and military personnel. Rather than breaking encryption, attackers use social engineering to trick victims into sharing security verification codes or PINs, or abuse Signal's linked devices feature to mirror messages in real time. Dutch government employees are confirmed among the victims. Authorities advise that encrypted consumer messaging apps should not be used for classified or sensitive communications, and released a cybersecurity advisory to help affected users secure their accounts.
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