On-Line Papers Published by Peter Reiher

Nguyen 11

Nam Nguyen, Leonard Kleinrock, and Peter Reiher. "The Interaction Analyzer: A Tool for Debugging Ubiquitous Computing Applications". Ubicomm, November 2011. Available as interaction_analyzer_2011.pdf

Kline 11

Erik Kline, Alex Afanaseyev, and Peter Reiher. "Shield: DoS Filtering Using Traffic Deflection". Second International Workshop on Security and Trust in the Future Internet (FIST), October 2011. Available as shield.pdf

Peterson 11

Peter Peterson, Digvijay Singh, William Kaiser, and Peter Reiher. "Investigating Energy and Security Trade-offs in the Classroom With the Atom LEAP Testbed". Workshop on Computer Security Education and Testbeds, August 2011. Available as CSET-LEAP-2011.pdf

Touch 11

Joe Touch, Ilia Baldine, Rudra Dutta, Gregory Finn, Bryan Ford, Scott Jordan, Dan Massey, Abraham Matta, Christos Papadopoulos, Peter Reiher, and George Rouskas. "A Dynamic Recursive Unified Internet Design (DRUID)". Computer Networks, April 2011. Available as druid.pdf

Peterson 10

Peter Peterson and Peter Reiher. "Security Exercises for the Online Classroom With DETER". Workshop on Computer Security Education and Testbeds, August 2010. Available as cset-paper-2010rad.pdf

Afanaseyev 10

Alex Afanaseyev, Neil Tilley, Peter Reiher, and Leonard Kleinrock. "Host-To-Host Congestion Control for TCP". IEEE COmmunications Surveys and Tutorials, Vol. 12, No. 3, Third Quarter 2010. Available as TCP-congestion-control.pdf

Kline 09b

Erik Kline, Matthew Beaumont-Gay, Jelena Mirkovic, and Peter Reiher. "RAD: Reflector Attack Defense Using Message Authentication Codes". Annual Computer Security Applications Conference (ACSAC), December 2009. Available as acsac_2009.pdf.

Kline 09a

Erik Kline and Peter Reiher. "Securing Data Through Avoidance Routing". New Security Paradigms Workshop, September 2009. Available as nspw09.pdf

Mirkovic 09b

Jelena Mirkovic, Alefiya Hussain, Sonia Fahmy, Peter Reiher, and Roshan Thomas. "Accurately Measuring Denial of Service in Simulation and Testbed Experiments". IEEE Transactions on Dependable and Secure Computing, Vol. 6, No. 2, April-June 2009. Available as TDSC-2008-04-0069.pdf

Ramakrishna 09

Venkata Ramakrishna, Peter Reiher, and Leonard Kleinrock. "Distributed Policy Resolution Through Negotiation in Ubiquitous Computing Environments". PerCom 2009, March 2009. Available as Percom_2009_Distributed_Policy_Resolution.pdf.

Mirkovic 09a

Jelena Mirkovic, Sonia Fahmy, Peter Reiher, and Roshan Thomas. "How to Test DoS Defenses". Cybersecurity Applications and Technologies Conference for Homeland Security (CATCH09), March 2009. Available as catch-ddos-2009.pdf.

Mirkovic 08b

Jelena Mirkovic and Peter Reiher. "Building Accountability Into the Future Internet". Network Protocol Security Workshop, October 2008. Available as npsec_2008.pdf.

Eustice 08b

Kevin Eustice, Amir Jourabchi, Jason Stoops, and Peter Reiher. "Improving User Satisfaction in a Ubiquitous Computing Environment". Workshop on Social Aspects of Ubiquitous Computing Environments, October 2008. Available as SAUCE_2008.pdf.

DaSilva 08

Timothy Da Silva, Kevin Eustice, and Peter Reiher. "Johnny Appleseed: Wardriving to Reduce Interference in Chaotic Wireless Deployments". MSWIM 2008, October 2008. Available as Johnny_Appleseed.pdf.

Mirkovic 08a

Jelena Mirkovic, Peter Reiher, Christos Papadopoulos, Alefiya Hussain, Marla Shepard, Michael Berg, and Robert Jung. "Testing a Collaborative DDoS Defense in a Red Team/Blue Team Exercise". IEEE Transactions on Computers, Vol. 57, No. 7., July 2008. Available as acm_transactions_2008.pdf.

Eustice 08a

Kevin Eustice, V. Ramakrishna, Nam Nguyen, and Peter Reiher. "The Smart Party: A Personalized Location-aware Multimedia Experience". Consumer Communications and Networking Conference (CCNC) 2008, January 2008. Available as Smart_Party_CCNC_2008.pdf.

Li 07

Jun Li, Jelena Mirkovic, Toby Ehrenkranz, Mengqiu Wang, Peter Reiher, and Lixia Zhang. "Learning the Valid Incoming Direction of IP Packets". Computer Networks. (52). October 2007, pp 399-417. Available as save2006.pdf.

Beaumont-Gay 07

Matthew Beaumont-Gay, Kevin Eustice, V. Ramakrishna, and Peter Reiher. "Information Protection Via Environmental Data Tethers". New Security Paradigms Workshop. September 2007. Available as data-tethers-nspw.pdf.

Wang 07

An-I (Andy) Wang, Geoff Kuenning, and Peter Reiher. "Using Permuted States and Validated Simulation to Analyze Conflict Rates in Optimistic Replication". Simulation: Transactions of the Society for Modeling and Simulation International, Vol. 83, No. 8, August 2007. Not yet available.

Eustice 07

Kevin Eustice, V. Ramakrishna, Alison Walker, Matthew Schnaider, Nam Nguyen, and Peter Reiher. "nan0sphere: Location-Driven Fiction for Groups of Users", Proceedings of the 12th International Conference on Human-Computer Interactions, July 2007. Available as hcii2007.pdf.

Mirkovic 07b

Jelena Mirkovic, B. WIlson, Alifiya Hussain, Sonia Fahmy, Peter Reiher, Roshan Thomas, and Steven Schwab. "Automating DDoS Experimentation", Deter Community Workshop on Cyber Security Experimentation and Test, July 2007. Available as deter.pdf.

Weddle 07b

Charles Weddle, Mathew Oldham, Jin Qian, An-I Andy Wang, Peter Reiher, Geoff Kuenning. PARAID: A Gear-Shifting Power-Aware RAID. ACM Transactions on Storage (TOS), 3(3), October 2007 (invited). Available as "tos2007.pdf.

Ramakrishna 07

V. Ramakrishna, Kevin Eustice, and Peter Reiher. "Negotiating Agreements Using Policies in Ubiquitous Computing Scenarios", IEEE International Conference on Service-Oriented Computing and Applications (SOCA), June 2007. Available as soca2007.pdf.

Mirkovic 07a

Jelena Mirkovic, Sonia Fahmy, Roshan Thomas, S. Wei, Peter. Reiher, Alyfia Hussain, B. Wilson, Steven Schwab, and R. Chertov. "DDoS Benchmarks and Experimentation Workbench for the DETER Testbed", Tridentcom, May 2007. Available as tric.pdf.

Weddle 07a

Charles Weddle, Mathew Oldham, Jin Qian, An-I Andy Wang, Peter Reiher, Geoff Kuenning. "PARAID: A Gear-Shifting Power-Aware RAID". Proceedings of the 5th USENIX Conference on File and Storage Technologies (FAST), February 2007. Available as fast2007.pdf.

Wang 06

An-I Andy Wang, Geoff Kuenning, Peter Reiher, and Gerald Popek. "The Conquest File System: Better Performance Through a Disk/Persistent-RAM Hybrid Design". ACM Transactions on Storage, 2(3), pp. 1-40, August 2006. Available as tos2006.pdf.

Oikonomou 06

George Oikonomou, Peter Reiher, Max Robinson, and Jelena Mirkovic, "A Framework for A Collaborative DDoS Defense," 2006 Annual Computer Security Applications Conference (ACSAC 22), December 2006. Available as defcom.pdf.

Mirkovic 06b

Jelena Mirkovic, E. Arikan, S. Wei, Sonia Fahmy, Roshan Thomas, and Peter Reiher, "Benchmarks for DDoS Defense Evaluation," Proceedings of the Milcom 2006, October 2006. Available as milcom06.pdf.

Mirkovic 06a

Jelena Mirkovic, Peter Reiher, Sonia Fahmy, Roshan Thomas, Alifia Hussein, Steven Schwab, and Calvin Ko, "Measuring Denial-of-Service," Proceedings of 2006 Quality of Protection Workshop, October 2006. Available as qop.pdf.

Ramakrishna 06

Venkata Ramakrishna, Max Robinson, Kevin Eustice, and Peter Reiher, "An Active Self-Optimizing Multiplayer Gaming Architecture," Cluster Computing, Vol. 9, No. 6, April 2006, pp 201-215. Available as cluster_computing.pdf.

Mirkovic 05

Jelena Mirkovic and Peter Reiher, "D-WARD: A Source-End Defense Against Flooding Denial-of-Service Attacks," IEEE Transactions on Dependable and Secure Computing, Vol. 2, No. 3, September 2005, pp. 216-232. Available as tdsc_2005.pdf.

Wang 05

An-I Andy Wang, Geoff Kuenning, and Peter Reiher, "Using Permuted States and Validated Simulation to Analyze Conflict Rates in Optimistic Replication," 2005 International Symposium on Performance Evaluation of Computer and Telecommunications Systems (SPECTS), July 2005. Available as spects_2005.html.

Jun 05

Jun Li, Toby Ehrenkranz, Geoff Kuenning, and Peter Reiher, "Simulation and Analysis on the Resiliency and Efficiency of Malnets," Symposium on Measurement, Modeling, and Simulation of Malware, June 2005. Available as malnet_sim.pdf.

Anderson 05

Everett Anderson, Kevin Eustice, Shane Markstrum, Mark Hanson, and Peter Reiher, "Mobile Contagion: SImulation of Infection and Disease," Symposium on Measurement, Modeling, and Simulation of Malware, June 2005. Available as mobile_worm.pdf.

Dunham 04

Margaret Dunham, Birgitta Koenig-Reis, Evaggelia Pitoura, Peter Reiher, and Can Turker, "Mobile Information Management: Executive Summary," Dagstuhul Seminar Proceedings, October, 2004. Available as 04441.SWM7.Paper.257.pdf

Ratner 04

David Ratner, Peter Reiher, and Gerald Popek, "ROAM: A Scalable Replication System for Mobility," ACM/Kluwer Mobile Applications and Networks (MONET), Vol.9, No. 5, October 2004, pp. 537-544. Available as roam_monet.pdf.

Mirkovic 04

Jelena Mirkovic and Peter Reiher, "A Taxonomy of DDoS Attacks and DDoS Defense Mechanisms," Computer Communications Review, Vol. 34, No. 2, April 2004. Available as ccr.pdf.

Nguyen 04

N. Nguyen, A. Wang, G. Kuenning, and P. Reiher, "Electric Field Routing: A Reliable Framework for Routing in MANETs," ACM Mobile Computing and Communications Review (MC2R), Vol. 8, No. 2, April 2004, pp. 35-49. Available as efr_mc2r.ps.

Li 04

Jun Li, Gerald Popek, and Peter Reiher, "Resilient Self-Organizing Overlay Networks for Security Update Delivery," IEEE Journal on Selected Areas in Communications, Special Issue on Service Overlay Networks, Vol. 22, No. 1, January 2004. Available as revere_jsac.pdf.

Rudenko 04

Alexey Rudenko and Peter Reiher, "Adaptation Planning for Unicast Communications in Active Networks," IWAN 2003, December 2003. Available as iwan.pdf.

Mirkovic 03b

Jelena Mirkovic, Max Robinson, and Peter Reiher, "Alliance Formation For DDoS Defense" New Security Paradigms Workshop, August 2003. Available as defcom-nspw.pdf.

Eustice 03b

Kevin Eustice, V. Ramakrishna, Shane Markstrum, Peter Reiher, and Gerald Popek, "WiFi Nomads and Their Unprotected Devices: The Case for QED-Quarantine, Examination, and Decontamination," New Security Paradigms Workshop, August 2003. Available as qed.pdf.

Wang 03

Wang, A., Kuenning, G,, Reiher, P., and Popek, G., "The Effects of Memory-Rich Environments on File System Microbenchmarks," SPECTS, July 2003. Available as spects03.pdf.

Eustice 03a

Eustice, K., Kleinrock, L., Markstrum, S., Popek, G., Ramakrishna, V., and Reiher, P., "Enabling Secure Ubiquitous Interactions," 1st International Workshop on Middleware for Pervasive Ad-Hoc Computing, 2003. Available as IWMPAC03.pdf.

Nguyen 03

Nguyen, N., Kuenning, G., and Reiher, P., "Detecting Insider Threats by Monitoring System Call Activity," IEEE Information Assurance Workshop, 2003. Available as insider.pdf.

Ramakrishna 03

Ramakrishna, V. Robinson, M., Eustice, K., and Reiher, P., "An Active Self-Optimizing Multiplayer Gaming Architecture," Adaptive Middleware Systems, June 2003. Available as ams03.pdf.

Mirkovic 03a

Jelena Mirkovic, Gregory Prier, and Peter Reiher, "Challenges of Source-End DDoS Defense," IEEE International Symposium on Network Computing and Applications , April 2003, Available as nca03.pdf.

Mirkovic 02

Jelena Mirkovic, Greg Prier, and Peter Reiher "Attacking DDoS at the Source," ICNP, November 2002, Available as dward.ps.

Burns 02

Michael Burns, Greg Prier, Jelena Mirkovic, and Peter Reiher "Implementing Address Assurance in the Intel IXP Router," Western Network Processors Conference, October 2002, Available as npc_paper.pdf.

Kuenning 02

Geoff Kuenning, Wilkie Ma, Peter Reiher, and Gerald Popek, "Simplifying Automated Hoarding Methods," MSWiM 2002, September 2002, Available as mswim.ps.

Wang 02b

An-I Wang, Peter Reiher, Rajive Bagrodia, Geoffrey Kuenning "Understanding the Behavior of the Conflict-Rate Metric in Optimistic Peer Replication," 5th IEEE Workshop on Mobility in Database and Distributed Systems, September 2002, Available as mdds2002.pdf.

Li 02c

Jun Li, Jelena Mirkovic, Mengqiu Wang, Peter Reiher, and Lixia Zhang, "SAVE: Source Address Validity Enforcement Protocol," Infocom 2002, July 2002, Available as infocom02.pdf.

Wang 02a

An-I Wang, Peter Reiher, Gerald Popek, and Geoffrey Kuenning, "Conquest: Better Performance Through a Disk/RAM Hybrid File System," Usenix 2002, June 2002, Available as usenix2002.ps.

Ferreria 02

Vincent Ferreria, Alexey Rudenko, Kevin Eustice, Richard Guy, V. Ramakrishna, and Peter Reiher, "Panda: Middleware to Provide the Benefits of Active Networks to Legacy Applications," DANCE 02 , May 2002, Available as panda.pdf.

Li 02b

Jun Li, Peter Reiher, Gerald Popek, Mark Yarvis, and Geoffrey Kuenning, "An Approach to Measuring Large-Scale Distributed Systems," Testcom 02, March 2002, Available as testcom02.pdf.

Li 02a

Jun Li, Mark Yarvis, and Peter Reiher, "Securing Distributed Adaptation," Computer Networks, Vol. 38, No. 3, January 2002, Available as sda.pdf.

Ratner 01

David Ratner, Peter Reiher, Gerald Popek, and Geoffrey Kuenning, "Application Requirements for Mobile Computing," Mobile Networks and Applications, Vol. 6, No. 6, November 2001, Available as replreq.ps.

Michel 01b

B. Scott Michel and Peter Reiher, "Peer-to-Peer Internetworking," Opensig 2001, September 2001, Available as Opensig.ps.

Michel 01a

B. Scott Michel and Peter Reiher "Peer-Through-Peer Communication for Information Logistics," Mobile Internet-based Services and Information Logistics Workshop, September 2001, Available as MISIL.ps.

Reiher 01

Peter Reiher, Kevin Eustice, and Kai-Min Sung, "Adapting Encrypted Data Streams in Open Architectures," Adaptive Middleware Workshop, August 2001, Available as AMSW.ps.

Li 01

Jun. Li, Mark Yarvis, Peter Reiher, "Securing Distributed Adaptation," OpenArch01, Available as Security_OpenArch01.ps.

Ekenstam 01

Todd Ekenstam, Peter Reiher, Charles Matheny, and Gerald Popek, "The Bengal Database Replication System," the Journal of Distributed and Parallel Databases, Vol. 9, No. 3, May 2001, Available as bengal.ps.

Badrinath00

B. Badrinath, Armando Fox, Leonard Kleinrock, Gerald Popek, Peter Reiher, and M. Satyanarayanan, "A Conceptual Framework for Network and Client Adaptation," Mobile Networks and Applications, Vol. 5, No. 4, 2000. Available as adaptation.ps.

Reiher00

Peter Reiher, Richard Guy, Mark Yarvis, and Alexey Rudenko, "Automated Planning for Open Architectures," Openarch 00, short paper session, March 2000. Available as planning.pdf.

Yarvis00

Mark Yarvis, Peter Reiher, and Gerald J. Popek, "A Reliability Model for Distributed Adaptation," Openarch 00, March 2000. Available as reliability.ps.

Michel00

Scott Michel, Peter Reiher, Constatin Nikolodakis, and Lixia Zhang, "URL Forwarding and Compression in Adaptive Web Caching," Infocom 2000, March 2000. Available as awc.ps.

Li99

Li Jun, Peter Reiher, and Gerald Popek, "Securing Information Transmission by Redundancy, the New Security Paradigms Workshop , September, 1999. Available as redundancy.ps.

Ratner99

David Ratner, Peter Reiher, and Gerald Popek, "Roam: A Scalable Replication System for Mobile Computing", Workshop on Mobile Databases and Distributed Systems (MDDS), September, 1999. Available as roam.ps

Tsai99c

Mitchell Tsai, Peter Reiher, and Gerald Popek, "Baby Steps From GUI Towards Dialogue: Mixed Intiative Computerese", AAAI'99 Workshop on Mixed Initiative Intelligence, July 1999. Available as AAAI.context.doc

Tsai99b

Mitchell Tsai, Peter Reiher, and Gerald Popek, "Operating System Services for Managing Context", AAAI'99 Workshop on Reasoning in Context for AI Applications`, July 1999. Available as AAAI.context.doc

Tsai99a

Mitchell Tsai, Peter Reiher, and Gerald Popek, "Command Management System for Next-Generation User Input", Seventh Workshop on Hot Topics in Operating Systems (HotOS), March 1999. Available as HotOS2.ps

Yarvis99

Mark Yarvis, Peter Reiher, and Gerald Popek, "A Framework for Distributed Adaptation", Seventh Workshop on Hot Topics in Operating Systems (HotOS), March 1999. Available as HotOS1.ps

Rudenko99

Alexey Rudenko, Peter Reiher, Gerald Popek, and Geoff Kuenning, "Portable Computer Battery Power Saving Using a Remote Processing Framework", Mobile Computing Systems and Application Track of the ACM SAC, February 1999. Available as SAC.ps

Wang99

An-I Wang, Peter Reiher, Rajive Bagrodia, and Gerald Popek, "A Simulation Evaluation of Optimistic Replicated Filing in a Mobile Environment", 18th IEEE International Performance, Computing, and Communications Conference, February, 1999. Available as IPCCC.pdf

Guy98

Richard Guy, Peter Reiher, David Ratner, Michial Gunter, Wilkie Ma, and Gerald Popek, "Rumor: Mobile Data Access Through Optimistic Peer-to-Peer Replication", Workshop on Mobile Data Access, November 1998. Available as rumor.ps.

Rudenko98

Alexey Rudenko, Peter Reiher, Gerald Popek, and Geoff Kuenning, "Saving Portable Computer Battery Power through Remote Process Execution", ACM Mobile Computing and Communication Review (MC2R), Vol. 2, No. 1, 1998. Available as power.pdf.

Kuenning98

Geoff Kuenning, Rajive Bagrodia, Richard Guy, Gerald Popek, Peter Reiher, and An-I Wang, "Measuring the Quality of Service of Optimistic Replication", ECOOP '98 Workshop on Mobility and Replication, July, 1998. Available as replqos.ps.

Ratner97

David Ratner, Peter Reiher, and Gerald Popek, "Replication Requirements in Mobile Environments", Proceedings of the Dial M for Mobility Workshop, Oct. 1997. Available as wards.pdf

Kuenning97

Geoff Kuenning, Peter Reiher, and Gerald Popek, "Experience with an Automated Hoarding System", Personal Technologies, Sept. 1997. Available as seerres.ps.

Ratner96

David Ratner, Gerald Popek, and Peter Reiher, "The Ward Model: A Scalable Replication Architecture for Mobility", Workshop on Object Replication and Mobile Computing, October 1996. Available as ormc96.ps.

Reiher96

Peter Reiher, Gerald Popek, Michial Gunter, John Salomone, David Ratner, "Peer-to-Peer Reconciliation Based Replication for Mobile Computers". European Conference on Object Oriented Programming '96 Second Workshop on Mobility and Replication, , June 1996. Available as ecoop.ps

Reiher94

Peter Reiher, John S. Heidemann, David Ratner, Gregory Skinner, and Gerald J. Popek. "Resolving file conflicts in the Ficus file system". In USENIX Conference Proceedings, pages 183-195. USENIX, June 1994. Available as ftp://ftp.cs.ucla.edu/pub/ficus/usenix_summer_94_resolver.ps.gz

Kuenning94

Geoffrey H. Kuenning, Gerald J. Popek, and Peter Reiher. "An Analysis of Trace Data for Predictive File Caching in Mobile Computing". In USENIX Conference Proceedings, pages 183-195. USENIX, June 1994. Available as ftp://ftp.cs.ucla.edu/pub/ficus/usenix_summer_94_statistics.ps.gz

Reiher93b

Reiher, P., Page, T., Popek, G., Cook, J., and Crocker, S., "Truffles - Secure File Sharing With Minimal System Administrator Intervention", Proceedings of the 1993 World Conference on System Administration, Networking, and Security, April, 1993. Available as ftp://ftp.cs.ucla.edu/pub/ficus/sans2.ps.gz

Reiher93a

Reiher, P., Page, T., Popek, G., Cook, J., and Crocker, S., "Truffles - A Secure Service For Widespread File Sharing", Proceedings of the Privacy and Security Research Group Workshop on Network and Distributed System Security, February, 1993. Available as ftp://ftp.cs.ucla.edu/pub/ficus/psrg93.ps.gz

Reiher92

Reiher, P., "Experiences With Optimistic Synchronization for Distributed Operating Systems", Proceedings of the Third Symposium on Experiences with Distributed and Multiprocessor Systems, March 1992. Available as Available as tw_experiences.pdf.

Reiher91c

Reiher, P. and Jefferson, D., "Supercritical Speedup", roceedings of the 24th Annual Simulation Symposium, April, 1991. Available as supercrit.pdf.

Reiher91b

Reiher, P., Bellenot, S., and Jefferson, D., Debugging the Time Warp Operating System and Its Applications, Proceedings of the Symposium on Experiences with Distributed and Multiprocessor Systems II, March 1991. Available as ftp://ftp.cs.ucla.edu/pub/ficus/reiher/tw.papers/tw_debug.ps.gz

Reiher91a

Reiher, P., Bellenot, S., and Jefferson, D., Temporal Decomposition of Simulations Under the Time Warp Operating System, Proceedings of the 1991 Principles of Distributed Simulation Conference, January 1991. Available as ftp://ftp.cs.ucla.edu/pub/ficus/reiher/tw.papers/tw_temporal_decomp.ps.gz

Presley90

Presley, M., Reiher, P., and Bellenot, S., A Time Warp Implementation of Sharks World, Proceedings of the 1990 Winter Simulation Conference, December 1990. Available as ftp://ftp.cs.ucla.edu/pub/ficus/reiher/tw.papers/shark.ps.gz

Reiher90c

Reiher, P. and Jefferson, D., Virtual Time Based Dynamic Load Management in the Time Warp Operating System, Transactions of the Society for Computer Simulation, Vol. 7, #2, June 1990. Available as ftp://ftp.cs.ucla.edu/pub/ficus/reiher/tw.papers/dlm.ps.gz

Reiher90b

Reiher, P., Parallel Simulation Using the Time Warp Operating System, Proceedings of the 1990 Winter Simulation Conference, December 1990. Available as ftp://ftp.cs.ucla.edu/pub/ficus/reiher/tw.papers/tw_tutorial.ps.gz

Reiher90a

Reiher, P., Wieland, F., and Hontalas, P., Providing Determinism in the Time Warp Operating System - Costs, Benefits, and Implications, Proceedings of the IEEE Workshop on Experimental Distributed Systems, October 1990. Available as ftp://ftp.cs.ucla.edu/pub/ficus/reiher/tw.papers/tw_determ.ps.gz