Zhijie Jerry Shi

University of Connecticut | UConn · Department of Computer Science and Engineering

Dynamic information flow tracking (DIFT) is an effective security countermeasure for both low-level memory corruptions and high-level semantic attacks. However, many software approaches suffer large performance degradation, and hardware approaches have high logic and storage overhead. We propose a flexible and light-weight hardware/software co-desi...

Monitoring a sensor network to quickly detect faults is important for maintaining the health of the network. Out-of-band monitoring, i.e., deploying dedicated monitors and transmitting monitoring traffic using a separate channel, does not require instrumenting sensor nodes, and hence is flexible (can be added on top of any application) and energy c...

In cryptography, a keyed-Hash Message Authenti- cation Code (HMAC) is a type of message authentication code (MAC) calculated with a cryptographic hash function and a secret key. The security of the HMAC relies on the underlying hash function and the secret key. Whirlpool is a block cipher based hash algorithm that has been in public for about ten y...

Program code in a computer system can be altered either by malicious security attacks or by various faults in microprocessors. At the instruction level, all code modifications are manifested as bit flips. In this paper, we present a generalized methodology for monitoring code integrity at run-time in application-specific instruction-set processors....

Underwater sensor networks (UWSNs) have emerged as a powerful technique for a wide range of aquatic applications. New challenges require novel research at every layer of the protocol stack. To efficiently compare various design, algorithms, and protocols, there is a pressing need for a generic architecture for underwater sensor networks. In this pa...

Wireless sensor networks have been used for many delay-sensitive applications, e.g., emergency response and plant automation. In such networks, delay measurement is important for a number of reasons, e.g., real-time control of the networked system, and abnormal delay detection. In this paper, we propose a measurement architecture using distributed...

Dynamic information flow tracking (DIFT) has been an effective security countermeasure for both low-level memory corruptions and high-level semantic attacks. However, many software approaches suffers from large performance degradation and hardware approaches have great logic and storage overhead. In this paper, we propose a flexible, efficient, and...

Power analysis attacks are a type of side-channel attacks that exploits the power consumption of computing devices to retrieve secret information. They are very effective in breaking many cryptographic algorithms, especially those running in low-end processors in embedded systems, sensor nodes, and smart cards. Although many countermeasures to powe...

Elliptic curve cryptography (ECC) has been adopted in many systems because it requires shorter keys than traditional public-key algorithms in primary fields. However, power analysis attacks can exploit the power consumption of ECC devices to retrieve secret keys. In this paper, we propose an efficient window-based countermeasure that is secure agai...

Because of limited resources at sensor nodes, sensor networks typically adopt symmetric-key algorithms to provide security functions such as protecting communications between nodes. In order to use symmetric-key algorithms, two nodes need to establish a secret session key first. In this paper, we propose a novel chord-based key establishment (CBKE)...

Providing scalable and ecient routing services in underwater sensor net- works (UWSNs) is very challenging due to the unique characteristics of UWSNs. Firstly, UWSNs often employ acoustic channels for communications because radio signals do not work well in water. Compared with radio-frequency channels, acous- tic channels feature much lower bandwi...

Elliptic Curve Cryptography (ECC) is a promising alternative for public-key algorithms in resource-constrained systems because it provides a similar level of security with much shorter keys than conventional integer-based public-key algorithms. ECC over binary field is of special interest because the operations in binary field are thought more spac...

(ASIPs) are being increasingly used in mobile embedded systems, the ubiquitous networking connections have exposed these systems under various malicious security attacks, which may alter the program code running on the systems. In addition, soft errors in microprocessors can also change program code and result in system malfunction. At the instruct...

As application-specific instruction set processors (ASIPs) are being increasingly used in mobile embedded systems, the ubiquitous networking connections have exposed these systems under various malicious security attacks, which may alter the program code running on the systems. In addition, soft errors in microprocessors can also change program cod...

Program code in a computer system can be altered either by malicious security attacks or by various faults in micro- processors. At the instruction level, all code modifications are manifested as bit flips. In this work, we present a gener- alized methodology for monitoring code integrity at run-time in application-specific instruction set processo...

The success of multicarrier modulation in the form of OFDM in radio channels illuminates a path one could take towards high-rate underwater acoustic communications, and recently there are inten- sive investigations on underwater OFDM. In this paper, we imple- ment the acoustic OFDM transmitter and receiver design of (4,5) on a TMS320C6713 DSP board...

Elliptic Curve Cryptography (ECC) provides a similar level of security to conventional integer-based public-key algorithms, but with much shorter keys. ECC over binary field is of special interest because the operations in binary field are thought more space and time efficient. However, the software implementations of ECC over binary field are stil...

Elliptic curve cryptography (ECC) has attracted a lot of attention because it can provide similar levels of security with much shorter keys than the arithmetic of multiple-precision integers in finite fields, which has been widely used in many public-key and key-exchange algorithms. Small key sizes are especially important to resource constrained d...

As emerging sensor networks are normally deployed in the field and thus vulnerable to many types of attacks, it is critical to implement cryptographic algorithms in sensor nodes to provide security services. Public-key algorithms, such as RSA and Elliptic Curve Cryptography (ECC), have been widely used for security purposes like digital signature a...