You might think the world's most powerful man would have access to any gadget he chooses - but when it comes consumer tech, Joe Biden may be sorely disappointed.

The electronic devices around the US president are perhaps the most prominent hacking targets in the world.

"The odds are zero, that [Russia] aren't targeting world leaders," Harvard Kennedy School lecturer Bruce Schneier says.

Back in the 2000s, this wasn't such a big problem - the only personal devices that could be hacked were computers and non-smart mobile phones.

And why would the president need a mobile, when he could ask to be patched through to anyone in the world on a secure line.

But that all changed in 2009, when Barack Obama took office.

He was so attached to his Blackberry he fought with security advisers for weeks to keep it - a fight he eventually won "through a compromise that allows him to stay in touch with senior staff and a small group of personal friends", according to an official.

And since then, the range of tech devices a president might want to use has steadily increased - giving security advisers sleepless nights.
The Obamapad

When the iPad came out, in 2010, of course, the president wanted one.

So national-security advisers created the ObamaPad, a "hardened", more secure iPad, which, a former adviser tells BBC News, was replicated for his staff.

"In the Obama administration, for senior staff, it was common to have an iPad that had... certain modifications to it," says Ari Schwartz, a National Security Council cyber-security official during the Obama administration.

Nevertheless, the tech set-up of the White House remained somewhat old fashioned.

"There's no wi-fi," Mr Schwartz says.

"And we actually had a little bit of a discussion at one point about adding wi-fi.

"It was more of a discussion like, 'Why can't we have wi-fi in the White House?'

"And the feeling was, 'Well, then you're opening up security lapses.'"

The Obamas' residence eventually installed wi-fi.

But it remained patchy at best, according to the family.

Donald Trump, arguably the most famous man on Twitter during his term, also insisted on using a personal device, reportedly a series of "burner" phones used briefly and then replaced for security reasons.

But he was also widely reported to be sceptical of computer use and email, preferring paper for most communications.
Biden's Peloton

If the iPad gave tech advisers a few sleepless nights back in the day, the internet of things, today, represents a recurring nightmare.

"Everything is becoming a computer," Mr Schneier says.

"And those computers are vulnerable.

"Whether it's your Peloton bike or your phone, your refrigerator, your thermostat, toys, your car - these are all vulnerable to hacking."

And that is a problem for President Biden, who seems to like his gadgets.

He has been photographed wearing an Apple Watch and reportedly owns a Peloton exercise bike that comes with a computer screen, camera, and microphone all connected to the internet.

Can that be made secure?

"You can do things like modify the hardware, like ripping the camera out, that's something that the NSA [National Security Agency] can do," Mr Schneier says.

And that may be safer.

But it may also defeat the purpose of having high-end technology in the first place.

Herbert Lin, of the University of Stanford, says: "It's very rare that you find a device that can't be hacked.

"Most devices that can't be hacked are pretty useless because they can't communicate."
'Smart' isn't safe

The safest thing is simply to not use any tech gadgets at all.

But, as the previous two presidents proved, that is a hard thing to tell the commander-in-chief.

According to Mr Biden's biographer Evan Osnos, the president also uses the Apple News app.

And this too could be a problem.

In fact, Mr Schwartz says, software can be hardest to protect.

"The software side, it's a lot harder to maintain good security around, because everything is updated from afar now," he says.

"You might be totally secure right now, the day that you buy the product.

"But then a year from now, someone could come in and install malware into it and destroy the security that you had originally."

And Mr Schneier shares these concerns.

"Everything is a potential vulnerability… Apple News, everything, because it's all connected, because anything can affect any other thing," he says.

"That's why this is so complicated.

"That's why ditching the device is often the best security advice, even if it's not practical."
Nightmare scenario

Late last year, news broke US government networks had been compromised by suspected Russian hackers.

The massive Solar Winds hack reportedly affected the treasury and commerce departments and Homeland Security.

Even worse, once the hackers were in, they lay undetected for months.

The hack showed two things:

foreign actors are looking for cracks in US cyber-security
there are gaps to be found

The nightmare scenario is a president's device is hacked, which then goes unnoticed.

And that a hack has happened so recently - and so close to the White House - will have President Biden's security team worried.

"Say the president's iPhone is hacked," Mr Lin says.

"Now, you have a homing beacon that the president is carrying."

Mr Biden is entering a White House nervous about cyber-security.

And advisers know what is most secure and what the president wants are not usually aligned.

President Biden may be the most powerful person in the most powerful country in the world.

But he may also have a fight on his hands to keep the gadgets many others take for granted.