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Cybersecurity researchers at the Georgia Institute of Technology have helped close a Full Report security vulnerability that could have allowed hackers to steal encryption keys from a favorite security package by temporarily listening in on unintended"side channel" signals from smartphones.

The attack, which was reported to applications developers before it had been publicized, took advantage of programming that has been, ironically, designed to offer better safety. The assault utilized intercepted electromagnetic signals from the phones that could have been analyzed using a small mobile device costing less than a thousand dollars. Unlike previously intercept attempts that demanded analyzing many logins, the"One & Done" attack was completed by eavesdropping on just one decryption cycle. .

"This is something which can be done at an airport to steal people's information without arousing suspicion and makes that the so-called'coffee shop attack' much more realistic," said Milos Prvulovic, associate chair of Georgia Tech's School of Computer Science. "The designers of encryption software now have another problem they need to take into account because continuous snooping long intervals will no longer be required to steal this information." .

The side channel attack is believed to be the first to retrieve the key exponent of an encryption key in a modern version of OpenSSL without relying on the cache organization and/or timing. OpenSSL is a popular encryption program used for protected interactions on sites and for signature authentication. The attack revealed a single recording of a cryptography key trace was sufficient to violate 2048 pieces of a private RSA key. .

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Outcomes of this study, that was supported in part by the National Science Foundation, the Defense Advanced Research Projects Agency (DARPA), and the Air Force Research Laboratory (AFRL) will be presented at the 27th USENIX Security Symposium August 16th in Baltimore.

After effectively attacking the phones and an embedded system board -- which used ARM processors -- the investigators proposed a fix for the vulnerability, which was adopted in versions of this software made available in May.

Side channel attacks extract sensitive information from signals created by electronic activity within computing devices during normal operation. The signals include electromagnetic emanations made by current flows within the devices computational and power-delivery circuitry, variation in power consumption, and also sound, temperature and chassis potential variation. These emanations are extremely different from communications signals the devices are designed to create. .

In their demonstration, Prvulovic and collaborator Alenka Zajic listened in on two different Android phones using probes located near, but not touching the devices. In an actual attack, signals could be obtained from phones or other mobile devices by antennas located beneath tables or hidden in nearby furniture.

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The"One & Done" attack analyzed signals in a relatively narrow (40 MHz wide) band around the phones' processor clock frequencies, that are close to 1 GHz (1,000 MHz). The investigators took advantage of a uniformity in programming that had been designed to overcome earlier vulnerabilities involving variations in how the programs operate. .