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Nearly 60,000 people have already signed up for an international scavenger hunt for a $1 million bitcoin prize

The first team to solve at least 400 clues will have enough key fragments to access the game's digital bitcoin wallet containing the $1 million prize.
Vint Cerf, one of the "fathers" of the internet, says the network had two big flaws when it launched.

The internet’s ‘father’ says it was born with two big flaws

Vint Cerf, now Google's chief internet evangelist, said he's not sure he would have fixed the problems if he had to do it all over again.
This coded letter from an inmate, intercepted by staff at Fulton County Jail in Atlanta, secretly ordered a hit on a staff member.

Any communication in and out of jail is closely scrutinized — so inmates turn to ingenious codes to convey secret messages

In jail, inmates may rely on a secret code to slip cryptic messages past corrections officers. Here are some of the most common, and one that was never solved.
Mark Adger, chief jailer at Fulton County Jail in Atlanta.

An Atlanta jail intercepted a letter from an inmate who was using a secret code to orchestrate a murder

The letter looked innocent at first glance, but actually contained a secret code ordering a hit on a jail staff member.

Top security expert: Trump’s unsecured Android phone could be used to spy on the president

"That Android has a microphone, which means that it can be turned into a room bug without anyone's knowledge. That's my real fear."

Top security expert: ‘There is no WhatsApp backdoor’

Don't worry. There is no backdoor like the FBI was seeking for the iPhone in WhatsApp.

A hacker claims he has more leaked NSA files to view — If you can solve this puzzle

A hacker named 1x0123 claims he has the other half of the recently-leaked NSA hacking toolkit — but samples are only available if you can figure out his puzzle.

After over a year of silence, a mysterious online puzzle has returned with a cryptic tweet

“Liber Primus is the way. Its words are the map, their meaning is the road, and their numbers are the direction.”