Detecting near-duplicate SPITs in voice mailboxes using hashes
ISC'11 Proceedings of the 14th international conference on Information security
Tag size does matter: attacks and proofs for the TLS record protocol
ASIACRYPT'11 Proceedings of the 17th international conference on The Theory and Application of Cryptology and Information Security
Padding and fragmentation for masking packet length statistics
TMA'12 Proceedings of the 4th international conference on Traffic Monitoring and Analysis
Website detection using remote traffic analysis
PETS'12 Proceedings of the 12th international conference on Privacy Enhancing Technologies
SkypeMorph: protocol obfuscation for Tor bridges
Proceedings of the 2012 ACM conference on Computer and communications security
StegoTorus: a camouflage proxy for the Tor anonymity system
Proceedings of the 2012 ACM conference on Computer and communications security
Touching from a distance: website fingerprinting attacks and defenses
Proceedings of the 2012 ACM conference on Computer and communications security
DriverGuard: Virtualization-Based Fine-Grained Protection on I/O Flows
ACM Transactions on Information and System Security (TISSEC)
Cover your ACKs: pitfalls of covert channel censorship circumvention
Proceedings of the 2013 ACM SIGSAC conference on Computer & communications security
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In this work, we unveil new privacy threats against Voice-over-IP (VoIP) communications. Although prior work has shown that the interaction of variable bit-rate codecs and length-preserving stream ciphers leaks information, we show that the threat is more serious than previously thought. In particular, we derive approximate transcripts of encrypted VoIP conversations by segmenting an observed packet stream into subsequences representing individual phonemes and classifying those subsequences by the phonemes they encode. Drawing on insights from the computational linguistics and speech recognition communities, we apply novel techniques for unmasking parts of the conversation. We believe our ability to do so underscores the importance of designing secure (yet efficient) ways to protect the confidentiality of VoIP conversations.