Elliptic curve(EC)based cryptosystems gained more attention due to enhanced security than the existing public key cryptosystems.A substitution box(S-box)plays a vital role in securing modern symmetric key cryptosystem...Elliptic curve(EC)based cryptosystems gained more attention due to enhanced security than the existing public key cryptosystems.A substitution box(S-box)plays a vital role in securing modern symmetric key cryptosystems.However,the recently developed EC based algorithms usually trade off between computational efficiency and security,necessitating the design of a new algorithm with the desired cryptographic strength.To address these shortcomings,this paper proposes a new scheme based onMordell elliptic curve(MEC)over the complex field for generating distinct,dynamic,and highly uncorrelated S-boxes.Furthermore,we count the exact number of the obtained S-boxes,and demonstrate that the permuted version of the presented S-box is statistically optimal.The nonsingularity of the presented algorithm and the injectivity of the resultant output are explored.Rigorous theoretical analysis and experimental results demonstrate that the proposedmethod is highly effective in generating a large number of dynamic S-boxes with adequate cryptographic properties,surpassing current state-of-the-art S-box generation algorithms in terms of security.Apart fromthis,the generated S-box is benchmarked using side-channel attacks,and its performance is compared with highly nonlinear S-boxes,demonstrating comparable results.In addition,we present an application of our proposed S-box generator by incorporating it into an image encryption technique.The encrypted and decrypted images are tested by employing extensive standard security metrics,including the Number of Pixel Change Rate,the Unified Average Changing Intensity,information entropy,correlation coefficient,and histogram analysis.Moreover,the analysis is extended beyond conventional metrics to validate the new method using advanced tests,such as the NIST statistical test suite,robustness analysis,and noise and cropping attacks.Experimental outcomes show that the presented algorithm strengthens the existing encryption scheme against various well-known cryptographic attacks.展开更多
To ensure the safety of the integral hoisting of precast pier boxes for sea-crossing bridges,this study focused on the sidewall height of the pier box and the width of the hoisting sling as core variables,established ...To ensure the safety of the integral hoisting of precast pier boxes for sea-crossing bridges,this study focused on the sidewall height of the pier box and the width of the hoisting sling as core variables,established a finite element model using ABAQUS,and conducted a safety analysis of the hoisting process.The results showed that optimal structural safety and cost-effectiveness were achieved by first casting the concrete base plate of the pier box,then constructing the sidewalls to a height of 500 mm,and subsequently using REE-100T eye&eye round slings for hoisting.Additionally,the implementation of local reinforcement measures(symmetrical stiffeners and steel sleeves)at the circular holes in the bottomplate of the pier box significantly alleviated stress concentration at these holes,effectively avoiding the risk of cracking caused by excessive local stress during the hoisting process.On-site hoisting practices verified the effectiveness of this optimized scheme,and the relevant research findings can provide a reference for the safety control of hoisting operations for similar large-scale precast components.展开更多
文摘Elliptic curve(EC)based cryptosystems gained more attention due to enhanced security than the existing public key cryptosystems.A substitution box(S-box)plays a vital role in securing modern symmetric key cryptosystems.However,the recently developed EC based algorithms usually trade off between computational efficiency and security,necessitating the design of a new algorithm with the desired cryptographic strength.To address these shortcomings,this paper proposes a new scheme based onMordell elliptic curve(MEC)over the complex field for generating distinct,dynamic,and highly uncorrelated S-boxes.Furthermore,we count the exact number of the obtained S-boxes,and demonstrate that the permuted version of the presented S-box is statistically optimal.The nonsingularity of the presented algorithm and the injectivity of the resultant output are explored.Rigorous theoretical analysis and experimental results demonstrate that the proposedmethod is highly effective in generating a large number of dynamic S-boxes with adequate cryptographic properties,surpassing current state-of-the-art S-box generation algorithms in terms of security.Apart fromthis,the generated S-box is benchmarked using side-channel attacks,and its performance is compared with highly nonlinear S-boxes,demonstrating comparable results.In addition,we present an application of our proposed S-box generator by incorporating it into an image encryption technique.The encrypted and decrypted images are tested by employing extensive standard security metrics,including the Number of Pixel Change Rate,the Unified Average Changing Intensity,information entropy,correlation coefficient,and histogram analysis.Moreover,the analysis is extended beyond conventional metrics to validate the new method using advanced tests,such as the NIST statistical test suite,robustness analysis,and noise and cropping attacks.Experimental outcomes show that the presented algorithm strengthens the existing encryption scheme against various well-known cryptographic attacks.
基金the Professor Scientific Research Start-up Fund of Hezhou University(2025JSQD04)the Special Project in Key Fields of the Guangdong Provincial Department of Education(No.2023ZDX3106).
文摘To ensure the safety of the integral hoisting of precast pier boxes for sea-crossing bridges,this study focused on the sidewall height of the pier box and the width of the hoisting sling as core variables,established a finite element model using ABAQUS,and conducted a safety analysis of the hoisting process.The results showed that optimal structural safety and cost-effectiveness were achieved by first casting the concrete base plate of the pier box,then constructing the sidewalls to a height of 500 mm,and subsequently using REE-100T eye&eye round slings for hoisting.Additionally,the implementation of local reinforcement measures(symmetrical stiffeners and steel sleeves)at the circular holes in the bottomplate of the pier box significantly alleviated stress concentration at these holes,effectively avoiding the risk of cracking caused by excessive local stress during the hoisting process.On-site hoisting practices verified the effectiveness of this optimized scheme,and the relevant research findings can provide a reference for the safety control of hoisting operations for similar large-scale precast components.
