The Experts below are selected from a list of 1656 Experts worldwide ranked by ideXlab platform
Mohsen Guizani - One of the best experts on this subject based on the ideXlab platform.
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stream based Cipher Feedback mode in wireless error channel
IEEE Transactions on Wireless Communications, 2009Co-Authors: Yang Xiao, Hsiaohwa Chen, Mohsen GuizaniAbstract:Block Ciphers encrypt a fixed size block of plaintext at a time to produce a block of Ciphertext. Stream Ciphers encrypt stream data, such as voice or Telnet traffic, one bit or more bits at a time. The Cipher Feedback mode is a stream Cipher implemented by a block Cipher via multiple stages, and in each stage one bit or a number of bits of plaintext are encrypted at a time. In this paper, we study error performance of the stream-based Cipher Feedback mode in an unreliable wireless channel in terms of throughput. We model performance of the Cipher Feedback mode in terms of the probability that part of or the whole Ciphertext can not be successfully decrypted, and the throughput by adopting the Cipher Feedback mode. We explicitly derive the optimal number of stages in the Cipher Feedback mode to achieve the optimal throughput, given an error rate in a wireless network. We also prove that for the Cipher Feedback mode, the whole Ciphertext is successfully decrypted if and only if the whole Ciphertext is successfully transmitted.
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optimal stream based Cipher Feedback mode in error channel
Global Communications Conference, 2005Co-Authors: Yang Xiao, Mohsen GuizaniAbstract:Block Ciphers encrypt a fixed size block of plaintext at a time to produce a block of Ciphertext. Stream Ciphers encrypt stream data, such as voice or Telnet traffic, one bit or more bits at a time. The Cipher Feedback mode is one stream Cipher implemented by a block Cipher via multiple stages, and in each stage, one bit or a number of bits of plaintext are encrypted at a time. In this paper, we study error performance of the stream-based Cipher Feedback mode in an error channel in terms of throughput. We model performance of the Cipher Feedback mode in terms of the probability that part/whole of the Ciphertext cannot be successfully decrypted, as well as the throughput by adopting the Cipher Feedback mode. We explicitly derive the optimal number of stages in the Cipher Feedback mode to achieve the optimal throughput, given an error rate.
Yang Xiao - One of the best experts on this subject based on the ideXlab platform.
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Cipher Feedback mode under go back n and selective reject protocols in error channels
Security and Communication Networks, 2013Co-Authors: Xiannuan Liang, Yang Xiao, Suat Ozdemir, Athanasios V Vasilakos, Hongmei DengAbstract:To produce Ciphertexts, two modes of encryption are applied—block Ciphers, which encrypt a fixed size block of plaintext at a time, and stream Ciphers, which encrypt stream data, one or more bits at a time. As one of stream Ciphers, the Cipher Feedback (CFB) mode is implemented by a block Cipher via multiple stages, and in each stage, 1 bit or a number of bits of plaintext are encrypted at a time. Throughout this paper, the study will focus upon the error performance of the stream-based CFB under two sliding-window protocols, go-back-N and selective-reject, in an error channel in terms of throughput. We model the performance of the CFB in terms of application-level throughput and derive the number of stages needed to achieve the optimal throughput, under a given error rate in an error channel. Copyright © 2012 John Wiley & Sons, Ltd.
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stream based Cipher Feedback mode in wireless error channel
IEEE Transactions on Wireless Communications, 2009Co-Authors: Yang Xiao, Hsiaohwa Chen, Mohsen GuizaniAbstract:Block Ciphers encrypt a fixed size block of plaintext at a time to produce a block of Ciphertext. Stream Ciphers encrypt stream data, such as voice or Telnet traffic, one bit or more bits at a time. The Cipher Feedback mode is a stream Cipher implemented by a block Cipher via multiple stages, and in each stage one bit or a number of bits of plaintext are encrypted at a time. In this paper, we study error performance of the stream-based Cipher Feedback mode in an unreliable wireless channel in terms of throughput. We model performance of the Cipher Feedback mode in terms of the probability that part of or the whole Ciphertext can not be successfully decrypted, and the throughput by adopting the Cipher Feedback mode. We explicitly derive the optimal number of stages in the Cipher Feedback mode to achieve the optimal throughput, given an error rate in a wireless network. We also prove that for the Cipher Feedback mode, the whole Ciphertext is successfully decrypted if and only if the whole Ciphertext is successfully transmitted.
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optimal stream based Cipher Feedback mode in error channel
Global Communications Conference, 2005Co-Authors: Yang Xiao, Mohsen GuizaniAbstract:Block Ciphers encrypt a fixed size block of plaintext at a time to produce a block of Ciphertext. Stream Ciphers encrypt stream data, such as voice or Telnet traffic, one bit or more bits at a time. The Cipher Feedback mode is one stream Cipher implemented by a block Cipher via multiple stages, and in each stage, one bit or a number of bits of plaintext are encrypted at a time. In this paper, we study error performance of the stream-based Cipher Feedback mode in an error channel in terms of throughput. We model performance of the Cipher Feedback mode in terms of the probability that part/whole of the Ciphertext cannot be successfully decrypted, as well as the throughput by adopting the Cipher Feedback mode. We explicitly derive the optimal number of stages in the Cipher Feedback mode to achieve the optimal throughput, given an error rate.
Howard M Heys - One of the best experts on this subject based on the ideXlab platform.
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pipelined statistical Cipher Feedback a new mode for high speed self synchronizing stream encryption
IEEE Transactions on Computers, 2011Co-Authors: Howard M Heys, Liang ZhangAbstract:In this paper, we introduce a new block Cipher mode of operation targeted to providing high-speed hardware-based self-synchronizing stream encryption. The proposed mode is a modification of statistical Cipher Feedback (SCFB) mode and is designed to be implemented using pipeline architectures for the block Cipher. We refer to the mode as pipelined SCFB mode or PSCFB. In this paper, we consider the implementation characteristics and show that PSCFB is able to achieve speeds that are very close to pipelined block Cipher implementations configured for counter mode. Such speeds are achieved with modest latency through the system and a small amount of memory required for the system queues with a provable guarantee of no queue overflow. Further, we examine the characteristics of PSCFB mode in response to bit errors and synchronization losses in the communication channel. Specifically, we show that the error propagation factor is modest and comparable to conventional SCFB and that synchronization recovery delay is reasonable given the expectation that synchronization loss is infrequent. Given the high efficiency and good communication characteristics of the mode, it is concluded that PSCFB is an excellent choice for high-speed network applications requiring stream-oriented encryption with self-synchronizing capabilities.
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hardware design and analysis of statistical Cipher Feedback mode using serial transfer
Canadian Conference on Electrical and Computer Engineering, 2007Co-Authors: Liang Zhang, Howard M HeysAbstract:In this paper, the hardware design of a recently proposed mode of operation for a block Cipher, referred to as statistical Cipher Feedback (SCFB), is investigated. Specifically, we examine a structure which employs serial transfer from the plaintext queue to the Ciphertext queue. SCFB mode is the hybrid of output Feedback (OFB) mode and Cipher Feedback (CFB) mode that allows a block Cipher to be configured as a self-synchronizing stream Cipher. Consequently, SCFB mode feeds back Ciphertext to the input of the block Cipher similar to the conventional CFB mode, except that the Feedback only occurs when the n bit sync-pattern is recognized thus making SCFB more efficient in its implementation than conventional CFB mode. An iterative based implementation of the advanced encryption standard (AES) is investigated and the relationship among three different clock domains associated with a serial transfer implementation is studied based on the synthesis results for various components of the system, as is the system efficiency. From simulations, an appropriate buffer size which minimizes queue overflow is selected for the design. The design is synthesized as an ASIC targeted to 0.18 CMOS standard cell technology. From the synthesis result, the throughput of the SCFB system is determined to be 100 Mbps. The total area of the SCFB system is approximately 41600 gates, of which 16900 is for AES.
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implementation of statistical Cipher Feedback mode using serial transfer
NECEC 2006., 2006Co-Authors: Liang Zhang, Howard M HeysAbstract:In this paper, the hardware implementation of a recently proposed mode of operation for a block Cipher, referred to as Statistical Cipher Feedback (SCFB), is investigated. Specifically, we examine a structure which employs serial transfer from the plaintext queue to the Ciphertext queue [1]. Serial transfer generally requires a simpler circuit than parallel transfer [2], but it has a clock limitation which constrains the system efficiency. In this paper, the hardware structure and method of hardware implementation for serial transfer SCFB mode is investigated. VHDL is used to describe the design for functional simulation and ASIC synthesis with 0.18 micron CMOS technology using synopsys tools supported by Canadian Microelectronics Corporations (CMC) is undertaken in the process of hardware implementation. References [1] Howard M. Heys, “Analysis of the Statistical Cipher Feedback Mode of Block Ciphers,” IEEE Transactions on Computers, vol. 52, issue 1, pp. 77-92, Jan. 2003. [2] Fang Yang “Analysis and Implementation of Statistical Cipher Feedback Mode and Optimized Cipher Feedback Mode,” Master Thesis, Memorial University of Newfoundland, Jan 2004.
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analysis of the statistical Cipher Feedback mode of block Ciphers
IEEE Transactions on Computers, 2003Co-Authors: Howard M HeysAbstract:In this paper, we examine a recently proposed mode of operation for block Ciphers which we refer to as statistical Cipher Feedback (SCFB) mode. SCFB mode configures the block Cipher as a keystream generator for use in a stream Cipher such that it has the property of statistical self -synchronization, thereby allowing the stream Cipher to recover from bit slips in the communication channel. Statistical self-synchronization involves feeding back Ciphertext to the input of the block Cipher similar to the conventional Cipher Feedback (CFB) mode, except that the Feedback only occurs when a special synchronization pattern is recognized in the Ciphertext. In the paper, we examine the efficiency, resynchronization, and error propagation characteristics of SCFB and compare these to conventional modes such as CFB and output Feedback (OFB). In particular, we study these characteristics of SCFB as a function of the synchronization pattern size. As well, we examine implementation issues of SCFB, focusing on the buffer requirements and resulting delay for a practical realization of the Cipher. We conclude that SCFB mode can be used to provide practical, efficient, self-synchronizing implementations for stream Ciphers. In particular, SCFB mode is best used in circumstances where slips are a concern and where implementation efficiency is a high priority in comparison to encryption latency.
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delay characteristics of statistical Cipher Feedback mode
Pacific Rim Conference on Communications Computers and Signal Processing, 2001Co-Authors: Howard M HeysAbstract:We investigate the delay characteristics of a mode of operation of block Ciphers, referred to as statistical Cipher Feedback (SCFB) mode. We conclude that SCFB can be operated at rates close to maximum efficiency with modest buffer requirements and delays. We also examine the characteristics of the Cipher mode for the new Advanced Encryption Standard based on 128-bit blocks and comment on the security of the SCFB mode of operation.
Santiago Celma - One of the best experts on this subject based on the ideXlab platform.
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self synchronized encryption for physical layer in gigabit ethernet optical links
IEEE Access, 2020Co-Authors: Adrian Perezresa, M Garciabosque, Carlos Sanchezazqueta, Santiago CelmaAbstract:In this work a new self-synchronized symmetric encryption solution for high speed communication systems necessary to preserve the format of the plaintext is proposed, developed and tested. This new encryption mechanism is based on the block Cipher operation mode called PSCFB (Pipelined Statistical Cipher Feedback) and the modulo operation. The confidentiality of this mode is analyzed in terms of its IND-CPA (Indistinguishability under Chosen-Plaintext Attack) advantage, concluding that it can be considered secure in the same way as traditional modes are. The encryption system has been integrated in the physical layer of a 1000Base-X Gigabit Ethernet Interface, where the 8b/10b symbol flow is encrypted at line rate. Moreover, an implementation of the proposed system has been carried out in an FPGA (Field Programmable Gate Array) device. Finally, an encrypted optical link has been tested with real Ethernet frames, getting maximum throughput and protecting the data traffic from passive eavesdroppers.
Liang Zhang - One of the best experts on this subject based on the ideXlab platform.
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pipelined statistical Cipher Feedback a new mode for high speed self synchronizing stream encryption
IEEE Transactions on Computers, 2011Co-Authors: Howard M Heys, Liang ZhangAbstract:In this paper, we introduce a new block Cipher mode of operation targeted to providing high-speed hardware-based self-synchronizing stream encryption. The proposed mode is a modification of statistical Cipher Feedback (SCFB) mode and is designed to be implemented using pipeline architectures for the block Cipher. We refer to the mode as pipelined SCFB mode or PSCFB. In this paper, we consider the implementation characteristics and show that PSCFB is able to achieve speeds that are very close to pipelined block Cipher implementations configured for counter mode. Such speeds are achieved with modest latency through the system and a small amount of memory required for the system queues with a provable guarantee of no queue overflow. Further, we examine the characteristics of PSCFB mode in response to bit errors and synchronization losses in the communication channel. Specifically, we show that the error propagation factor is modest and comparable to conventional SCFB and that synchronization recovery delay is reasonable given the expectation that synchronization loss is infrequent. Given the high efficiency and good communication characteristics of the mode, it is concluded that PSCFB is an excellent choice for high-speed network applications requiring stream-oriented encryption with self-synchronizing capabilities.
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new methods for the implementation of statistical Cipher Feedback mode
2008Co-Authors: Liang ZhangAbstract:In this thesis, we investigate a recently proposed mode of operation for block Ciphers, referred to as statistical Cipher Feedback (SCFB) mode. SCFB mode is designed for high speed stream-oriented transmission where it is necessary to recover from any number of bit slips or insertions in the communication channel, that is, SCFB has the capability of self-synchronization. SCFB mode is a hybrid of CFB mode and OFB mode, and hence, it has a higher throughput than CFB mode and can obtain self-synchronization while OFB mode cannot. As a result, SCFB mode can be applied physical layer security for applications such as SONET/SDH. -- In this thesis, SCFB mode using both serial transfer and parallel transfer is implemented in hardware. Additionally, we have implemented pipelined SCFB mode based on parallel transfer in hardware as well. The hardware implementation of these SCFB structures is thoroughly investigated. Throughout this research, VHDL and ModelSim SE 6.0 are used in the process of hardware design and verification. Further these SCFB modes which have been implemented are synthesized by using Synopsys tool (version 2002 and 2004) targeting to ASICs! based on 0.18 micron CMOS technology based on the TSMC (Taiwan Semiconductor Manufacturing Company) process supported by Canadian Microelectronics Corporation (CMC). -- As an outcome of our result, we have created a new modified version of SCFB mode, which we refer to as pipelined SCFB mode. Pipelined SCFB mode applies a block Cipher, which has pipelined architecture, and Counter(CTR) mode instead of OFB mode which is used in conventional SCFB mode. -- Based on the synthesis results, the throughput of the SCFB using serial transfer and parallel transfer (block transfer size equal to 4 bits) can reach 100 Mbps and 222 Mbps, respectively. The total number of gates of these two SCFB systems are 41600 and 43697, respectively. For the pipelined SCFB mode, the throughput and area complexity are 333 Mbps and 189963 gates. -- The performance analysis of pipelined SCFB mode is also provided with respect to characteristics such as synchronization recovery delay (SRD) and error propagation factor (EPF). Moreover, the analysis of system queues such as the number of bits in the plaintext queue, the queue size requirements and probability of queue overflow is also provided. -- Among these different implementations, the pipelined SCFB mode based on parallel transfer mode can obtain the highest throughput and the SCFB mode using serial transfer mode has the lowest area complexity. Hence, the pipelined SCFB mode using parallel transfer is more suitable for high speed physical layer security.
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hardware design and analysis of statistical Cipher Feedback mode using serial transfer
Canadian Conference on Electrical and Computer Engineering, 2007Co-Authors: Liang Zhang, Howard M HeysAbstract:In this paper, the hardware design of a recently proposed mode of operation for a block Cipher, referred to as statistical Cipher Feedback (SCFB), is investigated. Specifically, we examine a structure which employs serial transfer from the plaintext queue to the Ciphertext queue. SCFB mode is the hybrid of output Feedback (OFB) mode and Cipher Feedback (CFB) mode that allows a block Cipher to be configured as a self-synchronizing stream Cipher. Consequently, SCFB mode feeds back Ciphertext to the input of the block Cipher similar to the conventional CFB mode, except that the Feedback only occurs when the n bit sync-pattern is recognized thus making SCFB more efficient in its implementation than conventional CFB mode. An iterative based implementation of the advanced encryption standard (AES) is investigated and the relationship among three different clock domains associated with a serial transfer implementation is studied based on the synthesis results for various components of the system, as is the system efficiency. From simulations, an appropriate buffer size which minimizes queue overflow is selected for the design. The design is synthesized as an ASIC targeted to 0.18 CMOS standard cell technology. From the synthesis result, the throughput of the SCFB system is determined to be 100 Mbps. The total area of the SCFB system is approximately 41600 gates, of which 16900 is for AES.
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implementation of statistical Cipher Feedback mode using serial transfer
NECEC 2006., 2006Co-Authors: Liang Zhang, Howard M HeysAbstract:In this paper, the hardware implementation of a recently proposed mode of operation for a block Cipher, referred to as Statistical Cipher Feedback (SCFB), is investigated. Specifically, we examine a structure which employs serial transfer from the plaintext queue to the Ciphertext queue [1]. Serial transfer generally requires a simpler circuit than parallel transfer [2], but it has a clock limitation which constrains the system efficiency. In this paper, the hardware structure and method of hardware implementation for serial transfer SCFB mode is investigated. VHDL is used to describe the design for functional simulation and ASIC synthesis with 0.18 micron CMOS technology using synopsys tools supported by Canadian Microelectronics Corporations (CMC) is undertaken in the process of hardware implementation. References [1] Howard M. Heys, “Analysis of the Statistical Cipher Feedback Mode of Block Ciphers,” IEEE Transactions on Computers, vol. 52, issue 1, pp. 77-92, Jan. 2003. [2] Fang Yang “Analysis and Implementation of Statistical Cipher Feedback Mode and Optimized Cipher Feedback Mode,” Master Thesis, Memorial University of Newfoundland, Jan 2004.