Researchers have developed a new method to overcome one of the main issues in implementing a quantum cryptography system, raising the prospect of a useable ‘unbreakable’ method for sending sensitive information hidden inside particles of light. By ‘seeding’ one laser ...
If the universe allows ‘open timelike curves’, particles travelling back in time along them could help to perform currently intractable computations. Even though such curves don’t allow for interaction with anything in the past, researchers writing in npj Quantum Information ...
On the left, users first access mailboxes. Then, the server disconnects users from the mailboxes and adds cover traffic. An adversary cannot tell who is talking to whom by looking at mailbox access patterns. Anonymity networks, which sit on top ...