UK attack revives debate on access to tech security
Message sent on app before rampage could be clue to motive
LONDON — Westminster Bridge attacker Khalid Masood sent a WhatsApp message that cannot be accessed because it was encrypted by the popular messaging service, a top British security official said Sunday.
British press reports suggest Masood used the messaging service owned by Facebook just minutes before the Wednesday rampage that left three pedestrians and one police officer dead and dozens more wounded.
As controversy swirled over the encrypted messages, police made another arrest in Birmingham, England, where Masood had lived. The 30-year-old is one of two men now in custody over possible links to the attack. Neither has been charged or publicly named.
Home Secretary Amber Rudd used appearances on BBC and Sky News to urge WhatsApp and other encrypted services to make their platforms accessible to intelligence services and police trying to carrying out lawful eavesdropping.
“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,” she said.
But her call for a “back door” system to allow authorities to retrieve information is likely to meet resistance from the tech industry, which has faced previous law enforcement demands for access to data after major attacks.
Masood drove a rented SUV into pedestrians on Westminster Bridge before smashing it into Parliament’s gates and rushing onto the grounds, where he fatally stabbed a policeman and was shot by other officers. A detailed police reconstruction has found the entire attack lasted 82 seconds.
Police are trying to pinpoint his motive and identify possible accomplices, making the WhatsApp message a potential clue.
Rudd said attacks like Masood’s would be easier to prevent if authorities could penetrate encrypted services after obtaining warrants.
Rudd also urged technology companies to do a better job at preventing the publication of material that promotes extremism. She plans to meet with firms Thursday about setting up an industry board that would make the web less useful to extremists.
British police say they still believe Masood, a 52-year-old Briton, acted alone and say they have no indications that further attacks are planned.