WhatsApp has been criticized for failing to help police following the revelation that Khalid Masood used the encrypted messaging service shortly before running down numerous people and stabbing a policeman to death in London last week.
Rudd spoke out over the weekend, according to a new report from BBC, saying that police and other agencies should be granted access to encrypted messages with a view to countering future terrorist attacks.
Later this week, Rudd is due to meet with technology leaders to talk about how the government should be able to access messages protected by end-to-end encryption – something already dropped from the controversial snooper’s charter.
Rudd’s promise to “call time” on such operations comes after it was discovered the Westminster attacker’s final message was inaccessible due to WhatsApp’s end-to-end encryption system.
The Home Secretary says she has confronted firms including Facebook and Google after London police said they have been unable to access Masood’s final text message, or even decipher who he sent it to. Rudd described the situation as “completely unacceptable.”
“We need to make sure that organizations like WhatsApp, and there are plenty of others like that, don’t provide a secret place for terrorists to communicate with each other,” said Rudd.
“It used to be that people would steam open envelopes or just listen in on phones when they wanted to find out what people were doing, legally, through warranty,” she added. “But on this situation we need to make sure that our intelligence services have the ability to get into situations like encrypted WhatsApp.”