Experience

Research / Work Experience

August 2004 – August 2006 As Senior Software Engineer in SIM R&D Team developing products for Axalto (Smart Card Division of Schlumberger), France in Pine Labs (a division of GlobalLogic Inc.), Noida, India.

PayPhone
Developed applet titled PayPhone which enables the mobile phone with a SIM card to be used as Public Phone Booth. For end-users, this applet allows making calls with affordable amount, within planned limits, timed calls and provide assurance of not being cheated. All the time & cost parameters in the applet are configurable and is secured by PIN. The network called from the phone is decided at the run time and the cost of the call is calculated accordingly. The development required wise use of various phase 2+ proactive commands, java card APIs, SIM Toolkit and followed GSM 11.11 and GSM 11.14 standards. The complete development cycle of this product which involves feasibility, design and development has been handled by me; this has been launched in American and African markets by Axalto.

Abrevi8or & SIMleys
Developed Abrevi8or & SIMleys for SIM cards using java card APIs, phase 2+ proactive commands, STK and following GSM standards. It provides user a way to efficiently compose SMS by inserting abbreviations/smileys from the existing dictionary of Abbreviations/Smileys maintained in the applet. This makes the SMS composition faster. The applet is customizable by various setting options. Option of Concatenated SMS has been provided in the applet. Being a real time application, the challenge was the design of suitable data structures for effective storage of the large number abbreviations and smileys (in memory constrained SIM cards) and algorithms for very fast addition, search and deletion of the data from the large files maintaining its integrity. This applet was developed for Axalto and has already gone live in American and European markets. The complete development cycle involving feasibility, design and development has been done by me. Testing was done by Quality Analysts.

SIMDate
Developed SIM-Date for SIM cards. This applet provides effective way of maintaining To-Dos, Tasks, Participants and Reminder Setting mechanism for self (by alarm) or for participants (by sending SMS). Though this feature is presently available on some of the mobile phones, my development has made this feature available on SIM cards. This applet was developed for Axalto. The complete development cycle involving feasibility, design of file system and development has been done by me. Testing was done by Quality Analysts. This is already live in European market.

Nova
Developed Nova (with a team consisting of 3 developers), Loyalty Application for Banks, which enables banks to customize the charge slips/credit card receipt (which user gets af ter a transaction) according to the behavior of the Credit Card Holder . I was the owner of User Management module of the project. The whole module was implemented with the help of JAAS (Java Authentication and Authorization Services). Also I co-designed the database schema and wrote all the required stored procedures. I also interfaced the project with GSM modem, which sends a SMS to the user of credit card, whenever he/she is awarded with some loyalty points. This product is in-house product of GlobalLogic and has been bought by HDFC and ICICI bank in India and has already gone live in the market.

September 2003 - August 2004 As Applications Developer in Oracle, Hyderabad, India.

Was involved in Oracle Apps 11.5.10 development and contributed in Order Management Development Team. Order Management is a part of Oracle Apps which provides end-to-end solutions for customers for efficient automation of their processes. I added several new functionalities and enhanced the existing functionalities of this suite. During my involvement with the development cycle at Oracle, I could appreciate the concepts gained during my undergraduate studies by applying them in practical scenarios. Here, I got to observe various concepts being employed in real scenarios, such as, the drastic reduction in the cost of a query on introduction of a b-tree index on a column of the table. I made most of this opportunity by writing large piece of code for Oracle Apps 11iX and thus enhancing my programming skills.

August 2002 - May 2003 As Undergraduate Thesis, IIT Guwahati

My final year project was titled "Pseudo-Random Bit Generation using Cryptographic Primitives". Aim of the project was to design some provably secure pseudo random bit generators based on cryptographic primitives such as pseudo random functions. And I ended up with two new constructions and proved them to be secure. The advantage of my new constructions is that we can generate much longer sequences of random bits than those of the existing provably secure constructions. Moreover, a degree of parallelism was achieved in the second new construction.

Abstract

There are many ways to built pseudorandom bit generators. Some of them are based on some one-way function or they might use Linear Feedback Shift Registers. These types of constructions typically may have good statistical properties. But they are not provably secure. So, these constructions may be predictable. However, better provably secure pseudorandom bit generators can be built based on cryptographic primitives like block cipher that can be viewed as a pseudorandom function. In this report several such candidate constructions have been analyzed for their security. And on the basis of analysis of security of the candidate constructions I have proposed a new construction for generating pseudorandom bits and proved it to be secure. The advantage of my new construction is that we can generate much longer sequences of random bits than that of the previously existed provably secure constructions. At last, I have discussed another tree-like construction for generating very longer sequences of pseudorandom bits and that too in parallel and proved its security.

May 2002 - July 2002 As Summer Intern IIT Guwahati

Automated R&D Dept. and Sales & Purchase department of IIT Guwahati. I developed DBMS with backend in Oracle 8.0 & front end in Java Server Pages and completely tested for simulation level functionality. This project was accomplished under the supervision of Prof. Gautam Barua (Ex- Head of Dept., currently Director of IIT Guwahati).

Seminars

Term paper on GSM Security under the guidance of Dr. Riccardo Puccella.
Presented seminar on Network Flow Algorithms under the guidance of Dr. S.V. Rao as my Undergraduate Seminar in April 2002.
Term paper on Fragment Allocation Problem in Distributed Databases under the guidance of Dr. D. Goswami in October 2002.
Abstract
On a Wide Area Network (WAN), fragment allocation is a major issue in distributed database design since it concerns the overall performance of distributed database systems. Here I developed a simple and comprehensive model that reflects transaction behavior in distributed databases. Based on the model and transaction information, a heuristic algorithm is discussed to find a near-optimal allocation such that the total communication cost is minimized as much as possible. The results show that the fragment allocation found by the algorithms is close to being an optimal one.
Term Paper: Design of a Vector Quantization tool with a variable codebook size using Lloyd's and LBG algorithms to be used for speech recognition and ways to handle Empty Cell Problem in Vector Quantization

Awards & Achievements

Won Bronze Medal at SIMagine 2006 (Worldwide Mobile Communication & Java Card Developer Contest, sponsored by Sun Microsystems, Samsung & Axalto) at 3GSM World Congress at Barcelona for SIMSalvage, a Disaster Information & Management Applet.
Secured 5^th rank in Regional Mathematics Olympiad (RMO) and appeared in Indian National Mathematics Olympiad (INMO).
Selected in Top 10% in Physics Olympiad conducted by Indian Association of Physics Teachers (IAPT).
Awarded Merit cum Means scholarship for 4 consecutive years (1999-2003) by Indian Institute of Technology (IIT), Guwahati.
Selected in IIT Joint Entrance Exam for admission into IITs, where only 3000 students make out from 1,25,000 candidates & only top few of them make it to the Computer Science Departments of IITs.
Selected in MP Science Quiz (Rank 17 in Madhya Pradesh)and visited Indian Space Research Organization (ISRO), National Aeronautics Limited (NAL), Bhabha Atomic Research Center (BARC) etc. in tour conducted by Govt. of MP and State Institute of Science Education, Jabalpur, India when I was in X^th standard.

Relevant Courses & Grades

GRADUATE COURSES	GRADE
Algorithmic Power Tools	A
Intensive Principles of Programming Languages	A-
PhD Readings & Research	A
Wireless Networks	A
Advanced Algorithms (PhD Core)	A
Cryptography & Communication Security	A
Fundamentals of Computer Networks	A
UNDERGRADUATE COURSES	GRADE
Introduction to Computing	AB (9)
Introduction to Computing Lab	AB (9)
Data Structures	AA (10)
Data Structures Lab	AB (9)
Introduction to Logic	AA (10)
Systems Programming	AB (9)
Algorithms	BC (7)
Parallel Algorithms	AA (10)
Databases	AB (9)
Databases Lab	AB (9)
Operating Systems	BB (8)
Operating Systems Lab	BB (8)
Compilers	BB (8)
Software Engineering	BB (8)
Computer Networks	AB (9)
Data Communication	AB (9)
Fundamentals of Electrical Science	BB (8)
VLSI Design	BB (8)
Distributed Systems	BB (8)
Mathematics (1 & 3)	BB (8)
Probability & Random Variables	AB (9)
B.Tech. Final Year Project	AB (9)

Selected Undergraduate Academic Projects

Analysis and Simulation of various networking protocols and models
Guide	Dr. S. Nandi, Professor, Department of Computer Science and Engineering, IIT Guwahati.
Duration	January 2002 - April 2002
Abstract	In this project (done as part of the Computer Networks course) we analyzed and evaluated various network layer and transport layer protocols, Queue management policies, QoS parameters using the Network Simulator from Berkeley.
Enhancing the kernel of Nachos (Instructional OS and Mips simulator)
Guide	Dr. Santanu Chattopadhyay, Associate Professor, Department of Computer Science and Engineering, IIT Guwahati.
Duration	August 2001 – November 2001
Abstract	Starting from a bare bone Nachos kernel (from Berkeley), I implemented the support for multi-threading, context switching in Kernel threads, providing synchronization primitives, virtual memory, File System, Networking. Different scheduling policies for Process and Disk Management were implemented.
Design of a Compiler
Guide	Dr. Santanu Chattopadhyay, Associate Professor, Department of Computer Science and Engineering, IIT Guwahati.
Duration	January 2002 - April 2002
Abstract	This project (done as part of the Compilers course) involved the design and implementation of a compiler for a subset of Pascal. The design was based on the analysis-synthesis model. Modules for Lexical Analyzer, Parser, Semantic Analyzer, Intermediate Code Generator and Code-Optimizer were realized using the Lex and Yacc tools.
Development of a Graphics Software
Guide	Dr. S. V. Rao, Assistant Professor, Department of Computer Science and Engineering, IIT Guwahati.
Duration	January 2002 - April 2002
Abstract	This project (done as part of the Computer Graphics course) involved the development of a 3D Asteroid Game. The software used the OpenGL libraries for real-time navigation and 3D effects.
Designing a 4-bit Central Processing Unit
Guide	Dr. S.B. Nair, Associate Professor, Department of Computer Science and Engineering, IIT Guwahati
Duration	January 2001 - April 2001
Abstract	In this project, a cut-down instruction set of a CPU, the bus and the required micro programmed controller along with the I/O (by dip switches and seven segmented displays) was designed and implemented. Features included: 4 bit data bus, 8 bit address bus, 15 instructions including load and store (memory direct addressing), single operand add, subtract (register direct addressing), jump (memory direct).
Design of Shell in Linux using C++
Guide	Dr. Santanu Chattopadhyay, Associate Professor, Department of Computer Science and Engineering, IIT Guwahati.
Duration	January 2001 - April 2001
Abstract	The implementation consisted of a bare bones construction of the Shell of a Linux kernel, and had provisions for executing pipes, input/output redirection and supported background jobs in addition to the basic shell utilities.
Design and Implementation of a Tea Warehouse Database
Guide	Prof. G. Barua, Professor, Computer Science and Engineering, IIT Guwahati
Duration	August 2001 – November 2001
Abstract	This project involved the design and implementation of a Tea Warehouse Database. The System was implemented using the Oracle Database Management System and issues such as Synchronization and Concurrent Access Control were addressed.
Design and implementation of a Library Management Software
Guide	Dr. P.K. Das, Assistant Professor, Department of Computer Science and Engineering, IIT Guwahati
Duration	January 2001 - April 2001
Abstract	This project (done as part of the Software Engineering course) involved the design and implementation of a Library Management Software. The database was implemented using Java as the front end and MS-Access as the back end.