scholarly journals An Encryption Technique for Provably Secure Transmission from a High Performance Computing Entity to a Tiny One

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Miodrag J. Mihaljević ◽  
Aleksandar Kavčić ◽  
Kanta Matsuura
Keyword(s):  
High Performance ◽  
Point Of View ◽  
Secret Key ◽  
Information Theoretic ◽  
Channel Output ◽  
Security Enhancement ◽  
Channel Input ◽  
Binary Channel ◽  
Theoretic Point ◽  
Encryption Decryption

An encryption/decryption approach is proposed dedicated to one-way communication between a transmitter which is a computationally powerful party and a receiver with limited computational capabilities. The proposed encryption technique combines traditional stream ciphering and simulation of a binary channel which degrades channel input by inserting random bits. A statistical model of the proposed encryption is analyzed from the information-theoretic point of view. In the addressed model an attacker faces the problem implied by observing the messages through a channel with random bits insertion. The paper points out a number of security related implications of the considered channel. These implications have been addressed by estimation of the mutual information between the channel input and output and estimation of the number of candidate channel inputs for a given channel output. It is shown that deliberate and secret key controlled insertion of random bits into the basic ciphertext provides security enhancement of the resulting encryption scheme.

scholarly journals A Security Enhanced Encryption Scheme and Evaluation of Its Cryptographic Security

Entropy ◽  
2019 ◽  
Vol 21 (7) ◽  
pp. 701
Author(s):  
Miodrag J. Mihaljević
Keyword(s):  
Error Correction ◽  
Channel Capacity ◽  
Security Level ◽  
Encryption Scheme ◽  
Secret Key ◽  
Error Correction Coding ◽  
Security Enhancement ◽  
Encryption Schemes ◽  
Cryptographic Security ◽  
Encryption Decryption

An approach for security enhancement of a class of encryption schemes is pointed out and its security is analyzed. The approach is based on certain results of coding and information theory regarding communication channels with erasures and deletion errors. In the security enhanced encryption scheme, the wiretapper faces a problem of cryptanalysis after a communication channel with bits deletion and a legitimate party faces a problem of decryption after a channel with bit erasures. This paper proposes the encryption-decryption paradigm for the security enhancement of lightweight block ciphers based on dedicated error-correction coding and a simulator of the deletion channel controlled by the secret key. The security enhancement is analyzed in terms of the related probabilities, equivocation, mutual information and channel capacity. The cryptographic evaluation of the enhanced encryption includes employment of certain recent results regarding the upper-bounds on the capacity of channels with deletion errors. It is shown that the probability of correct classification which determines the cryptographic security depends on the deletion channel capacity, i.e., the equivocation after this channel, and number of codewords in employed error-correction coding scheme. Consequently, assuming that the basic encryption scheme has certain security level, it is shown that the security enhancement factor is a function of the deletion rate and dimension of the vectors subject to error-correction encoding, i.e., dimension of the encryption block.

scholarly journals Security Enhancement in Cloud Environment using Secure Secret Key Sharing

2020 ◽  
Vol 16 (4) ◽  
pp. 296-307
Author(s):  
Sakshi Chhabra ◽  
Ashutosh Kumar Singh
Keyword(s):  
Private Information ◽  
Key Management ◽  
Interpolation Method ◽  
Experimental Results ◽  
Secret Key ◽  
Sensitive Data ◽  
Time Consumption ◽  
Security Enhancement ◽  
Encryption Decryption ◽  
And Performance

Securing the data in distributed cloud system is considered one of the major concern for the cloud customers who faces security risks. The data leakage or data tampering are widely used by attackers to extract the private information of other users who shares the confidential data through virtualization. This paper presents Secure Secret Sharing (SSS) technique which is being recognized as one of the leading method to secure the sensitive data. It shares encrypted data over cloud and generated secret key is split into different parts distributed to qualified participants (Qn) only which is analyzed by malicious checkers. It verifies the clients based on their previous performances, whether these users proved to be authorized participant or not. The key computation is evaluated by the Key handler (KH) called trusted party which manages authorized control list, encryption/decryption and reconstruction of key shares. The Lagrange’s interpolation method is used to reconstruct the secret from shares. The experimental results shows that the proposed secure data sharing algorithm not only provides excellent security and performance, but also achieves better key management and data confidentiality than previous countermeasures. It improves the security by using secure VM placement and evaluated based on time consumption and probability computation to prove the efficacy of our algorithm. Experiments are performed on cloudsim based on following parameters i.e. time computation of key generation; response time and encryption/decryption. The experimental results demonstrate that this method can effectively reduce the risks and improves the security and time consumption upto 27.81% and 43.61% over existing algorithms.

scholarly journals Designing a high performance cryptosystem for video streaming application

2015 ◽  
Vol 18 (3) ◽  
pp. 200-209
Author(s):  
Toan Van Nguyen ◽  
Dang Quoc Minh Do ◽  
Phuc Duc Nguyen ◽  
Thuan Huu Huynh ◽  
Thuc Dinh Nguyen
Keyword(s):  
Video Streaming ◽  
High Performance ◽  
Public Key ◽  
Bit Rate ◽  
Secret Key ◽  
Streaming Application ◽  
High Security ◽  
Symmetric Key ◽  
Encryption Decryption ◽  
High Processing

This paper presents the hardware design of a high performance cryptosystem for video streaming application. Our proposed system is the combination of two cryptographic algorithms, symmetric key algorithm and asymmetric key algorithm (also called public key algorithm) to take their benefits. The symmetric key algorithm (ZUC) is used to encrypt/decrypt video, and the public key algorithm (RSA) performs the encryption/ decryption for the secret key. This architecture has high performance, including high security and high processing bit rate. High security is achieved due to the ease of key distribution of the asymmetric key cryptosystem and the secret key can be easily changed. The high processing bit rate of video encryption/decryption is the result of the high speed of encryption/decryption of the symmetric key algorithm. The H.264 video decoder is also integrated into this system to test the functionality of the proposed cryptosystem. This system is implemented in Verilog-HDL, simulated by using the ModelSim simulator and evaluated by using Altera Stratix IV-based Development Kit. The speed of video decryption achieves up to 4.0 Gbps at the operating frequency of 125 MHz, which satisfies applications with high bandwidth requirement such as video streaming.

scholarly journals Revisiting and Improving Algorithms for the 3XOR Problem

2018 ◽  
pp. 254-276
Author(s):  
Charles Bouillaguet ◽  
Claire Delaplace ◽  
Pierre-Alain Fouque
Keyword(s):  
Black Box ◽  
Specific Form ◽  
Point Of View ◽  
Difficult Case ◽  
Huge Amount ◽  
Information Theoretic ◽  
Random Functions ◽  
Geometric Problems ◽  
Birthday Problem ◽  
Theoretic Point

The 3SUM problem is a well-known problem in computer science and many geometric problems have been reduced to it. We study the 3XOR variant which is more cryptologically relevant. In this problem, the attacker is given black-box access to three random functions F,G and H and she has to find three inputs x, y and z such that F(x) ⊕ G(y) ⊕ H(z) = 0. The 3XOR problem is a difficult case of the more-general k-list birthday problem. Wagner’s celebrated k-list birthday algorithm, and the ones inspired by it, work by querying the functions more than strictly necessary from an information-theoretic point of view. This gives some leeway to target a solution of a specific form, at the expense of processing a huge amount of data. However, to handle such a huge amount of data can be very difficult in practice. This is why we first restricted our attention to solving the 3XOR problem for which the total number of queries to F, G and H is minimal. If they are n-bit random functions, it is possible to solve the problem with roughly

scholarly journals Joint Brain Parametric -Map Segmentation and RF Inhomogeneity Calibration

2009 ◽  
Vol 2009 ◽  
pp. 1-14 ◽  
Author(s):  
Ping-Feng Chen ◽  
R. Grant Steen ◽  
Anthony Yezzi ◽  
Hamid Krim
Keyword(s):  
Human Subjects ◽  
Brain Magnetic Resonance Imaging ◽  
Point Of View ◽  
Segmentation Method ◽  
Tissue Segmentation ◽  
Information Theoretic ◽  
Map Segmentation ◽  
Theoretic Point ◽  
Rf Inhomogeneity ◽  
Magnetic Resonance Imaging Mri

We propose a constrained version of Mumford and Shah's (1989) segmentation model with an information-theoretic point of view in order to devise a systematic procedure to segment brain magnetic resonance imaging (MRI) data for parametric -Map and -weighted images, in both 2-D and 3D settings. Incorporation of a tuning weight in particular adds a probabilistic flavor to our segmentation method, and makes the 3-tissue segmentation possible. Moreover, we proposed a novel method to jointly segment the -Map and calibrate RF Inhomogeneity (JSRIC). This method assumes theaveragevalue of white matter is the same across transverse slices in the central brain region, and JSRIC is able to rectify the flip angles to generate calibrated -Maps. In order to generate an accurate -Map, the determination of optimal flip-angles and the registration of flip-angle images are examined. Our JSRIC method is validated on two human subjects in the 2D -Map modality and our segmentation method is validated by two public databases, BrainWeb and IBSR, of -weighted modality in the 3D setting.

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