China’s recent breach of the innermost workings of the U.S. telecommunications system reached far deeper than the Biden administration has described, the chairman of the Senate Intelligence Committee said, with hackers able to listen in on telephone conversations and read text messages. Senator Mark Warner of Virginia, a former telecommunications executive, said he had been stunned by the scope and depth of the breach, which was engineered over the past year by a group linked to Chinese intelligence that has been named Salt Typhoon by Microsoft, whose cybersecurity team discovered the hack in the summer.
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