Tim Cook is set to wade into the war over encryption by speaking at a White House cybersecurity summit

Tim Cook is expected to talk at a White House security summit on Friday amid heated debate over tech companies' use of encryption, The Hill reports.

In recent months, Apple and other tech companies have hardened their stance on encryption, introducing "strong" encryption by default that cannot be decrypted even when law enforcement has a warrant. This has frustrated authorities, with one senior American police officer saying that the iPhone will become the "phone of choice for the paedophile."

It's easy to understand law enforcement's frustration. As products using strong encryption become more widespread, they're losing access to sources of information they once had. It's making their jobs considerably harder. But on the other hand, encryption proponents argue that by introducing back doors for the government, it weakens the entire system and puts potentially sensitive data at risk. "There is no back door that only works for good guys," says author and activist Cory Doctorow.

British Prime Minister David Cameron also discussed the issue recently, indicating he intends to ban strong encryption if he wins the May 2015 General Election. "[Do] we want to allow a means of communication between two people which even in extemis with a signed warrant from the home secretary personally that we cannot read?" he asked. "My answer to that question is no, we must not." Critics have slammed the proposals as dangerous and technically unworkable.

Nonetheless, debate continues as authorities push to reach a compromise. The Hill reports that a senior US Department of Justice official "told Apple executives that children would die as a result of investigators' inability to access the company's devices."

As such, Cook's comments at the White House summit, which is to be held at Stanford University, will be closely monitored.

In an open letter on Apple's website, Cook previously wrote that the company has "never worked with any government agency from any country to create a backdoor in any of our products or services. We have also never allowed access to our servers. And we never will."

And in the wake of the leak of dozens of high-profile female celebrities' intimate photos last year, Cook also addressed the issue on an interview with Charlie Rose. (It's believed the files were stolen from Apple's iCloud cloud hosting service.) "Things [were] written in the press that people had backdoors to our servers," he said. "None of that is true. Zero. We would never allow that to happen. They would have to cart us out in a box before we would do that."

Apple Insider reports that Obama is going to talk about his latest cybersecurity executive action at the White House conference. It calls for "increased cooperation between US technology companies and the Department of Homeland Security's National Cybersecurity and Communications Integration Center."