Researchers from the Massachusetts Institute of Technology's Computer Science and Artificial Intelligence Laboratory and the Swiss Federal Institute of Technology in Lausanne this month will present new technology for protecting anonymity online at the Privacy Enhancing Technologies Symposium (PETS 2016) in Darmstadt, Germany.
The researchers say their new approach provides stronger security guarantees but uses bandwidth much more efficiently than previous anonymity networks.
The team has developed a system called Riffle, which employs several existing cryptographic techniques but combines them in a novel manner.
The heart of Riffle is a series of servers called a mixnet, and each server permutes the order in which it receives messages before passing them on to the next. The system uses onion encryption, and it thwarts message tampering with a technique called verifiable shuffle, which enables the server to generate a mathematical proof that the messages it sends are valid manipulations of the ones it receives.
Riffle also uses a technique called authentication encryption to verify the authenticity of encrypted messages. As long as one server in the mixnet remains uncompromised, Riffle is cryptographically secure.
From MIT News
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