Covert Channel for One-Way Delay Measurements

Cola, Mario Di; Lucia, Giorgio De; Mazzà, Daniela; Patrignani, Maurizio; Rimondini, Massimo

doi:10.1109/icccn.2009.5235268

Cited by 6 publications

(6 citation statements)

References 10 publications

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“…As a related work we also distinguish the proposal of [33], aiming to use a covert channel, where unused bits of the IP datagram would transfer a coded timestamp from sender to receiver, from which one-way delays and thus additional delays can be estimated. While this approach is passive in the sense that no extra traffic is created, it requires the modification of each and every data packet, which is infeasible given the limited API to the protocol stack, and limited computational resources of a mobile device.…”

Section: Related Workmentioning

confidence: 99%

Estimating Performance of Mobile Services from Comparative Output-Input Analysis of End-to-End Throughput

Fiedler

Wac

Bults³

et al. 2013

IEEE Trans. on Mobile Comput.

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Section: Related Workmentioning

confidence: 99%

Estimating Performance of Mobile Services from Comparative Output-Input Analysis of End-to-End Throughput

Fiedler

Wac

Bults³

et al. 2013

IEEE Trans. on Mobile Comput.

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“…The minimum OWD(i+j) experienced among all those measured, including that of packet i+1, is denoted as D min. The consideration of consecutive packets is not required as long as TS between two packets is conveyed to the destination host (there are several options for implementing this requirement [12]; however, they are outside the scope of this paper). Figure 2 describes the relationships among OWD, OWDV, and D min .…”

Section: One-way Delay Variation: δ(I+j)mentioning

confidence: 99%

“…This scheme uses GPS and NTP for clock synchronization. Another passive OWD scheme is based on the assumption that PTP achieves clock synchronization [12].…”

Section: Introductionmentioning

confidence: 99%

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Measurement Scheme for One-Way Delay Variation with Detection and Removal of Clock Skew

Aoki

Oki

Rojas‐Cessa³

2010

ETRI J

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One‐way delay variation (OWDV) has become increasingly of interest to researchers as a way to evaluate network state and service quality, especially for real‐time and streaming services such as voice‐over‐Internet‐protocol (VoIP) and video. Many schemes for OWDV measurement require clock synchronization through the global‐positioning system (GPS) or network time protocol. In clock‐synchronized approaches, the accuracy of OWDV measurement depends on the accuracy of the clock synchronization. GPS provides highly accurate clock synchronization. However, the deployment of GPS on legacy network equipment might be slow and costly. This paper proposes a method for measuring OWDV that dispenses with clock synchronization. The clock synchronization problem is mainly caused by clock skew. The proposed approach is based on the measurement of inter‐packet delay and accumulated OWDV. This paper shows the performance of the proposed scheme via simulations and through experiments in a VoIP network. The presented simulation and measurement results indicate that clock skew can be efficiently measured and removed and that OWDV can be measured without requiring clock synchronization.

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“…This scheme, yet passive, it is based on GPS and NTP for clock synchronization. Another scheme for measurement of OWD was proposed [11]. However, it is based on the assumption that PTP achieves clock synchronization.…”

Section: Introductionmentioning

confidence: 99%

Scheme to measure One-Way Delay Variation with detection and removal of clock skew

Aoki

Oki

Rojas‐Cessa

2010

2010 International Conference on High Performance Switching and Routing

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One-Way Delay Variation ( ) has become increasingly of interest to evaluate network state and service quality, especially for real-time and streaming services such as VoIP and video. Measurement of these parameters needs to be performed with the layout infrastructure. Many schemes for OWD measurements require clock synchronization at the source and destination through Global-Positioning System (GPS) or the Network Time Protocol (NTP). In clock-synchronized approaches, the accuracy of the measurement of depends on the achieved accuracy of clock synchronization. GPS provides high-accuracy clock synchronization. However, the deployment of GPS on legacy network equipment might be slow and costly. This paper proposes a method for measuring without recurring to clock synchronization. However, clock skew may affect the measurement of . The proposed approach is based on the measurement of Inter-Packet Delay ( ) and Accumulated (AOWDV). This paper shows the performance of the proposed scheme via simulation and through experimentation in a VoIP network. The presented simulation and experimental results indicate that clock skew can be efficiently measured and removed and that can be measured without requiring clock synchronization.Index Terms-delay measurement, clock skew, clock rate adjustment, one-way delay, inter-packet delay.

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Covert Channel for One-Way Delay Measurements

Cited by 6 publications

References 10 publications

Estimating Performance of Mobile Services from Comparative Output-Input Analysis of End-to-End Throughput

Estimating Performance of Mobile Services from Comparative Output-Input Analysis of End-to-End Throughput

Measurement Scheme for One-Way Delay Variation with Detection and Removal of Clock Skew

Scheme to measure One-Way Delay Variation with detection and removal of clock skew

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