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About 591 papers for “Keystream”

Strumok keystream generator

І.Д. Горбенко, Alexandr Kuznetsov, Yuriy Gorbenko et al. · 2018 IEEE 9th International Conference on Dependable Systems, Services and Technologies (DESSERT) · 2018

This work presents the main results of development of a new keystream generator, which is named “Strumok”, and offered as a candidate for the national symmetric encryption standard of Ukraine. Strumok is built on SNOW2.0-like schema of the summation generator; increased secret key length and the initialization vector allow using reliably the stream cipher even taking into account quantum cryptographic analysis methods. There are basic transformation and individual results from the cipher performance research, here the generator is shown, which is capable of forming a keystream at speeds exceeding 10 Gbit per sec.

Cited by 36

The LILI-128 Keystream Generator

2008

The LILI-128 keystream generator is a LFSR based synchronous stream cipher with a 128 bit key. The design offers large period and linear complexity, and is resistant to currently known styles of attack. LILI is simple to implement in hardware or software. 1

Cited by 0

Key-Keystream Avalanche effect.

Shahnwaz Afzal (22184546), Mohammad Ubaidullah Bokhari (22184549), Mahfooz Alam (14096469) et al. · Figshare · 2025

<div> The Internet of Things (IoT) includes vehicles, homes, and integrated sensors and many interconnected physical devices that gather and share data to interact with their environment. Data moving across multiple levels is vulnerable to various security threats, including leaks and unauthorized access. IoT faces significant challenges in balancing strict security with optimal performance metrics such as energy efficiency, throughput, and memory. We present a novel lightweight stream cipher designed to secure IoT communication and address these challenges. The proposed architecture features four main components: a logistic round module that produces 32-bit chaotic outputs; two 80-bit shift registers, LFSR and NLFSR, for key expansion; and multiplexer units to enhance confusion and diffusion. This model improves the randomness and robustness of the keystream, strengthening the cipher against cryptanalytic attacks. An ablation research is performed by methodically eliminating the chaotic map, NLFSR, and multiplexer components to assess their individual effects on encryption/decryption duration, throughput, entropy, and avalanche analysis. Experimental results demonstrate that each component significantly improves the cipher’s overall performance and security, hence confirming the architecture’s design and also demonstrate that the proposed cipher exceeds the performance of current algorithms, including Grain-128 and RSA-1024, in terms of encryption/decryption time, throughput, and energy efficiency, while maintaining comparable statistical randomness to AES and Trivium. This method achieves an average Shannon entropy of 7.9996, and successfully passing all 15 NIST statistical randomness tests. A subsequent study analyzing the avalanche effect and correlation coefficients reinforces the strength of the encryption. The proposed encryption method, designed for resource-constrained environments, provides efficient and robust cryptographic security to protect IoT data effectively. </div>

Cited by 0Open access

Avalanche Effect (%) of Key- Keystream.

Shahnwaz Afzal (22184546), Mohammad Ubaidullah Bokhari (22184549), Mahfooz Alam (14096469) et al. · Figshare · 2025

<div> The Internet of Things (IoT) includes vehicles, homes, and integrated sensors and many interconnected physical devices that gather and share data to interact with their environment. Data moving across multiple levels is vulnerable to various security threats, including leaks and unauthorized access. IoT faces significant challenges in balancing strict security with optimal performance metrics such as energy efficiency, throughput, and memory. We present a novel lightweight stream cipher designed to secure IoT communication and address these challenges. The proposed architecture features four main components: a logistic round module that produces 32-bit chaotic outputs; two 80-bit shift registers, LFSR and NLFSR, for key expansion; and multiplexer units to enhance confusion and diffusion. This model improves the randomness and robustness of the keystream, strengthening the cipher against cryptanalytic attacks. An ablation research is performed by methodically eliminating the chaotic map, NLFSR, and multiplexer components to assess their individual effects on encryption/decryption duration, throughput, entropy, and avalanche analysis. Experimental results demonstrate that each component significantly improves the cipher’s overall performance and security, hence confirming the architecture’s design and also demonstrate that the proposed cipher exceeds the performance of current algorithms, including Grain-128 and RSA-1024, in terms of encryption/decryption time, throughput, and energy efficiency, while maintaining comparable statistical randomness to AES and Trivium. This method achieves an average Shannon entropy of 7.9996, and successfully passing all 15 NIST statistical randomness tests. A subsequent study analyzing the avalanche effect and correlation coefficients reinforces the strength of the encryption. The proposed encryption method, designed for resource-constrained environments, provides efficient and robust cryptographic security to protect IoT data effectively. </div>

Cited by 0Open access

The LILI-128 Keystream Generator

E. Dawson, A. Clark, J. Golic, W. Millan, L. Penna, L. Simpson · 2007

The LILI-128 keystream generator is a LFSR based synchronous stream cipher with a 128 bit key. The design offers large period and linear complexity, and is resistant to currently known styles of attack. LILI is simple to implement in hardware or software.

Cited by 0

Keystream Generator Based On Simulated Annealing

Ayad A. Abdulsalam · SHILAP Revista de lepidopterología · 2011

Advances in the design of keystream generator using heuristic techniques are reported. A simulated annealing algorithm for generating random keystream with large complexity is presented. Simulated annealing technique is adapted to locate these requirements. The definitions for some cryptographic properties are generalized, providing a measure suitable for use as an objective function in a simulated annealing algorithm, seeking randomness that satisfy both correlation immunity and the large linear complexity. Results are presented demonstrating the effectiveness of the method.

Cited by 2Open access

Average Avalanche effect for Key-Keystream.

Shahnwaz Afzal (22184546), Mohammad Ubaidullah Bokhari (22184549), Mahfooz Alam (14096469) et al. · Figshare · 2025

<div> The Internet of Things (IoT) includes vehicles, homes, and integrated sensors and many interconnected physical devices that gather and share data to interact with their environment. Data moving across multiple levels is vulnerable to various security threats, including leaks and unauthorized access. IoT faces significant challenges in balancing strict security with optimal performance metrics such as energy efficiency, throughput, and memory. We present a novel lightweight stream cipher designed to secure IoT communication and address these challenges. The proposed architecture features four main components: a logistic round module that produces 32-bit chaotic outputs; two 80-bit shift registers, LFSR and NLFSR, for key expansion; and multiplexer units to enhance confusion and diffusion. This model improves the randomness and robustness of the keystream, strengthening the cipher against cryptanalytic attacks. An ablation research is performed by methodically eliminating the chaotic map, NLFSR, and multiplexer components to assess their individual effects on encryption/decryption duration, throughput, entropy, and avalanche analysis. Experimental results demonstrate that each component significantly improves the cipher’s overall performance and security, hence confirming the architecture’s design and also demonstrate that the proposed cipher exceeds the performance of current algorithms, including Grain-128 and RSA-1024, in terms of encryption/decryption time, throughput, and energy efficiency, while maintaining comparable statistical randomness to AES and Trivium. This method achieves an average Shannon entropy of 7.9996, and successfully passing all 15 NIST statistical randomness tests. A subsequent study analyzing the avalanche effect and correlation coefficients reinforces the strength of the encryption. The proposed encryption method, designed for resource-constrained environments, provides efficient and robust cryptographic security to protect IoT data effectively. </div>

Cited by 0Open access

Neural Network Identification of Keystream Generators

Jeffery J. Leader, James E. Heyman · 1993

Abstract : Applications such as stream ciphers and spread spectra require the generation of binary keystreams to implement, and the simulation of such keystreams to break. Most cryptanalytic attacks are of the known generator type, that is, they assume knowledge of the method used to generate the keystream. We show that a neural network can be used to identify the generator, and in some cases to simulate the keystream.... Keystream generators.

Cited by 1

A New Construction Method for Keystream Generators

Çağdaş Gül, Orhun Kara · 2023

&lt;p&gt;We introduce a new construction method of diffusion layers for Substitution Permutation Network (SPN) structures along with its security proofs. The new method can be used in block ciphers, stream ciphers, hash functions, and sponge constructions. Moreover, we define a new stream cipher mode of operation through a fixed pseudorandom permutation and provide its security proofs in the indistinguishability model. We refer to a stream cipher as a Small Internal State Stream (SISS) cipher if its internal state size is less than twice its key size. There are not many studies about how to design and analyze SISS ciphers due to the criterion on the internal state sizes, resulting from the classical tradeoff attacks. We utilize our new mode and diffusion layer construction to design an SISS cipher having two versions, which we call DIZY. We further provide security analyses and hardware implementations of DIZY. In terms of area cost, power, and energy consumption, the hardware performance is among the best when compared to some prominent stream ciphers, especially for frame-based encryptions that need frequent initialization. Unlike recent SISS ciphers such as Sprout, Plantlet, LILLE, and Fruit; DIZY does not have a keyed update function, enabling efficient key changing. &lt;/p&gt;

Cited by 0Open access

Improved Analysis of the BMGL Keystream Generator

2001

In this paper we give an improved security analysis of the NESSIE sub-mission BMGL. The new analysis improves also asymptotically some of the theoretical results on which the BMGL keystream generator is based. We also give an alternative, bootstrapped version of the gener-ator which is implementation-wise very close to the original generator and offers even stronger provable security properties. 1

Cited by 0

Dynamic filtered keystream generator DF-FCSR-8

Zhen PAN, Xiao-hu TANG · SHILAP Revista de lepidopterología · 2012

Based on the investigation of the filtered key stream generator family F-FCSR using feedback with carry shift register(FCSR)as components,especially the reason what makes F-FCSR-Hv2 key stream generator failed,a dynamic filtered generator named DF-FCSR-8 was presented.This generator avoids Hell-Johansson attack and its key stream sequences can pass the test of NIST's suit STS.Finally,it can also resist many other attacks.

Cited by 0Open access

Cryptanalysis of Bluetooth Keystream Generator Two-level E0

Y.H. Gui Q. Tan R.W. Lu, Serge Vaudenay · Infoscience (Ecole Polytechnique Fédérale de Lausanne) · 2004

Abstract. In this paper, we carefully study both distinguishing and keyrecovery attacks against Bluetooth two-level E0 given many short frames. Based on a flaw in the resynchronization of Bluetooth E0, we are able to fully exploit the largest bias of the finite state machine inside E0 for our attacks. Our key-recovery attack works with 2 40 simple operations given the first 24 bits of 2 35 frames. Compared with all existing attacks against two-level E0, this is the best one so far. 1

Cited by 2Open access