Engineer Software

Taehwan Choi

Computer Science Department

University of Texas at Austin Mobile: 512-***-****

INFORMATION

* ********** ******* ***** *-mail: *******@**.******.***

Austin, TX 78701 USA Homepage: http://www.cs.utexas.edu/~ctlight

Obtains a full time position involving system research and development

OBJECTIVE

The University of Texas at Austin, USA Aug 31, 2005 Dec 22, 2012 (Expected)

EDUCATION

Ph.D. Candidate in Computer Science

Advisor: Prof. Mohamed Gouda

Thesis: Weak and Strong Authentication in Computer Networks

Yonsei University, Korea Mar 2, 2000 Feb 25, 2002

M.S. in Computer Science

Advisor: Prof. JooSeok Song

Thesis: Combinatorial Mobile IP: A Study on E cient Mobility Management Using Minimized

Paging and Local Registration in Mobile IP Environments

Sogang University, Korea Feb 18, 1992 Feb 17, 1998

B.S. in Mathematics

Design of advanced network protocols

RESEARCH

INTERESTS

Design of authentication protocols in computer networks

Security in wired and wireless communication networks

Web security

VMWare, Palo Alto, CA

EXPERIENCE

Member of Technical Sta Intern Jun 11, 2012 Aug 24, 2012

Apple, Cupertino, CA

Software Engineer Intern May 23, 2011 Aug 12, 2011

Computer Science Department, UT Austin, TX

Teaching Assistant for following classes: Spring 2006 present

CS 386S Network Protocol Security (Graduate Class)

CS 439 Principles of Computer Systems

CS 356 Computer Networks

CS 347 Data Management

CS 378 Information Assurance and Security

CS 361 Introduction to Computer Security

CS 337 Theory in Programming Practice

CS313E Elements of Software Design

CS 303E Elements of Computers and Programming

CS 320N Computers for the Ground Up

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LG Electronics, Seoul, Korea

Research Engineer Mar 1, 2002 May 19, 2005

Analyzed and debugged Short Message Service regarding User Interface and message trans-

mission.

Designed and implemented new services related with Short Message Service required by service

providers such as Voice Memo, VOD, and Multiple Message Transmission.

Co-worked with User Interface team and Call Processing team to debug critical bugs including

hang and reset bugs.

Ported MSM 6500 based Short Message Service source codes to MSM 7000.

Processed binary release for manufacturing.

Traveled to test roaming services.

POSCO ICT(formerly POSDATA), Seoul, Korea

Software Engineer Sept 1, 1998 Feb 28, 2002

Developed and maintained Billing System for SHINSEGI Telecom.

Adjusted and recovered customer database records and prevented customer complaints.

HTTPI

SELECTED

We designed and implemented HTTPI a transport protocol that is inexpensive to use and cache-

PROJECTS

friendly like HTTP and yet provides some security guarantees, mostly message integrity and server

authentication like HTTPS. HTTPI is implemented on Apache 2.2.11 and tested it with httperf over

100 Mbps and 1 Gbps Ethernet and showed through experiments that the throughput of HTTPI is

within 1.2 % from that of HTTP and 37 % better than that of HTTPS.

TLP

The current login protocol in HTTPS, namely TLS, cannot defend against Phishing and Pharming

attacks. Thus, we designed a new version of this protocol named TLP that can successfully defend

against these attacks. TLP allows each user to have exactly one password that the user can use

to log into many or all web sites. However, if the passwords are stolen, then the stored passwords

cannot be used in impersonating the user to any web site, nor can it be used in impersonating any

web site to the user. TLP is implemented with AES and SHA-1 using AJAX, Java Servlets, Firefox,

and Tomcat.

ABC2

We designed an interworking architecture between cellular networks and WLAN supporting large

ranges and high bandwidth. We envisioned the future network with mobile devices having multiple

network interfaces before the advent of iPhone and proposed to leverage cellular networks and WLAN

for multimedia networks. We showed the performance improvements through simulation.

OCSP

We implemented Online Certi cate Status Protocol (OCSP) for obtaining the revocation status of

X.509 digital certi cates. We developed OCSP client on Windows and OCSP responder with Apache

web server on Linux.

Programming Languages C, C++, Java, Perl, Python, Lisp, Haskell, SQL

TECHNICAL

Internet Technologies HTML, CSS, PHP, JavaScript

SKILLS

System Environments Linux, Windows, Mac OS X, DEC VMS, Sun Solaris, ARM

System Tools L TEX, Eclipse, Emacs, Make, GDB, Trace32, MySQL, Oracle, Rational Rose

A

CVS, SVN, ClearCase, Test Director

PUBLICATIONS

2

Taehwan Choi, H. B. Acharya, and Mohamed G. Gouda, Is That You? Authentication in a

Journal Articles

Network without Identities, International Journal of Security and Networks, 2011

H. B. Acharya, Taehwan Choi, Rida A. Bazzi, Mohamed G. Gouda, The K-Observer Problem

in Computer Networks, Networking Science, 2011

Taehwan Choi, Laeyoung Kim, JeongEun Nah, and JooSeok Song, Combinatorial Mobile

IP: A New E cient Mobility Management Using Minimized Paging and Local Registration in

Mobile IP Environments, ACM/Baltzer Journal for Wireless Networks, Vol. 10, No. 3, May

2004

Taehwan Choi, H. B. Acharya, and Mohamed G. Gouda, Is That You? Authentication

Conference and

Workshop Papers in a Network without Identities, Communication and System Security Symposium of IEEE

Globecom 2011

H. B. Acharya, Taehwan Choi, Rida A. Bazzi, and Mohamed G. Gouda, The K-Observer

Problem in Computer Networks, 13th International Symposium on Stabilization, Safety, and

Security of Distributed Systems (SSS), 2011

Taehwan Choi, and Mohamed G. Gouda, HTTPI: An HTTP with Integrity, The First Inter-

national Workshop on Privacy, Security and Trust in Mobile and Wireless Systems (MobiPST)

2011

Taehwan Choi, H. B. Acharya, and Mohamed G. Gouda, TPP: The Two-Way Password Pro-

tocol, IEEE International Conference on Computer Communications and Networks (ICCCN)

2011

Taehwan Choi, H. B. Acharya, and Mohamed G. Gouda, The Best Keying Protocol for

Sensor Networks, 2nd IEEE International Workshop on Data Security and PrivAcy in wireless

Networks (D-SPAN) 2011

Taehwan Choi, Sooel Son, Mohamed G. Gouda, and Jorge A. Cobb, Pharewell to Phishing

10th International Symposium on Stabilization, Safety, and Security of Distributed Systems

(SSS) 2008

Gene Moo Lee, and Taehwan Choi, Improving the Interaction between Overlay Routing and

Tra c Engineering, IFIP Networking 2008

Taehwan Choi, Sunghoon Seo, and JooSeok Song, ABC 2 : A New Approach to Seamless

Mobility between Cellular Networks and WLAN, IEEE Wireless Communications and Net-

working Conference (WCNC) 2008

Taehwan Choi, An E cient Mobile Management Scheme in Mobile IP Environments, U.S.

PATENTS

Patent 10/303,837, Filed: Nov. 25, 2002, Awarded: Jul. 14, 2003

Taehwan Choi, An E cient Mobile Management Scheme in Mobile IP Environments, E.P.O

Patent 02 028 666.2, Filed: Nov. 25, 2002, Awarded: Jan. 13, 2004

Travel grants to present papers at SSS 2008, WCNC 2008, and Globecom 2011

HONORS AND

AWARDS

Corporation scholarship, LG Electronics, Fall 2000 Fall 2001

Merit-based scholarship for partial tuition support, Sogang University, 1993 and 1997

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