Tech companies have been criticized for their efforts disrupting the online terror planning since the most recent attack in London, but one cybersecurity analyst told CNBC there is little they can do.
Security consultant Brian Honan, CEO of BH Consulting, said asking tech companies to provide security services with special access to online communication can't be done without sacrificing the kind of encryption used in everyday business and communication.
"It is not possible mathematically and technically to create a back door or golden key that can only be used by law enforcement to bypass that encryption. What you are doing is weakening the strong property of encryption," Honan said.
In the wake of Saturday's attack, which left seven dead, Prime Minister Theresa May asked big internet firms to do more in the fight on terror and called for wider regulation on companies operating in the sector.