随着安全通信要求的提高,卫星通信信号的隐蔽性备受关注。提出了一种基于Arnold变换的抗截获波形设计方法,采用图像领域中的Arnold变换,将扩频信号在频域进行置乱后发送,使得置乱后的信号在时域上不具备扩频信号的周期特性,在频域上更...随着安全通信要求的提高,卫星通信信号的隐蔽性备受关注。提出了一种基于Arnold变换的抗截获波形设计方法,采用图像领域中的Arnold变换,将扩频信号在频域进行置乱后发送,使得置乱后的信号在时域上不具备扩频信号的周期特性,在频域上更具有随机特性,提高信号传输的安全性。经Arnold变换后的信号采用时延相关法进行检测,不能检测出明显的相关峰。根据时延相关的结果,采用峰均比(Peak-to-Average Power Ratio, PAPR)检测,分析置乱信号的检测概率。与传统扩频信号相比,设计的信号波形在相同信噪比和检测门限条件下,具有更低的检测概率,抗截获性能更好。经过仿真验证可知,接收端根据Arnold反变换,恢复出包含有重要信息的原始信号,并且经过Arnold变化后的信号几乎不会造成误码率的波动和提升。展开更多
Single-pixel imaging(SPI)can transform 2D or 3D image data into 1D light signals,which offers promising prospects for image compression and transmission.However,during data communication these light signals in public ...Single-pixel imaging(SPI)can transform 2D or 3D image data into 1D light signals,which offers promising prospects for image compression and transmission.However,during data communication these light signals in public channels will easily draw the attention of eavesdroppers.Here,we introduce an efficient encryption method for SPI data transmission that uses the 3D Arnold transformation to directly disrupt 1D single-pixel light signals and utilizes the elliptic curve encryption algorithm for key transmission.This encryption scheme immediately employs Hadamard patterns to illuminate the scene and then utilizes the 3D Arnold transformation to permutate the 1D light signal of single-pixel detection.Then the transformation parameters serve as the secret key,while the security of key exchange is guaranteed by an elliptic curve-based key exchange mechanism.Compared with existing encryption schemes,both computer simulations and optical experiments have been conducted to demonstrate that the proposed technique not only enhances the security of encryption but also eliminates the need for complicated pattern scrambling rules.Additionally,this approach solves the problem of secure key transmission,thus ensuring the security of information and the quality of the decrypted images.展开更多
Arnold Bennett is well-known for his regional novels that mainly represent domestic quotidian lives of his pottery town,especially the lower and middle class.However,his infatuation with the hotel space implicates his...Arnold Bennett is well-known for his regional novels that mainly represent domestic quotidian lives of his pottery town,especially the lower and middle class.However,his infatuation with the hotel space implicates his ambition to re-situate his characters within the parameters of hotel and create new types of characters,representing in new ways the subjectivity of characters and their relations with material space.Based on his hotel writing,this article intends to re-conceive the historical reasons of his obsession with hotel space and further probe the modernity deflected by his representation of domestic selves and modern public identities in hotel space.展开更多
Reversible data hiding is an information hiding technique that requires the retrieval of the error free cover image after the extraction of the secret image.We suggested a technique in this research that uses a recurs...Reversible data hiding is an information hiding technique that requires the retrieval of the error free cover image after the extraction of the secret image.We suggested a technique in this research that uses a recursive embedding method to increase capacity substantially using the Integer wavelet transform and the Arnold transform.The notion of Integer wavelet transforms is to ensure that all coefficients of the cover images are used during embedding with an increase in payload.By scrambling the cover image,Arnold transform adds security to the information that gets embedded and also allows embedding more information in each iteration.The hybrid combination of Integer wavelet transform and Arnold transform results to build a more efficient and secure system.The proposed method employs a set of keys to ensure that information cannot be decoded by an attacker.The experimental results show that it aids in the development of a more secure storage system and withstand few tampering attacks The suggested technique is tested on many image formats,including medical images.Various performance metrics proves that the retrieved cover image and hidden image are both intact.This System is proven to withstand rotation attack as well.展开更多
文摘随着安全通信要求的提高,卫星通信信号的隐蔽性备受关注。提出了一种基于Arnold变换的抗截获波形设计方法,采用图像领域中的Arnold变换,将扩频信号在频域进行置乱后发送,使得置乱后的信号在时域上不具备扩频信号的周期特性,在频域上更具有随机特性,提高信号传输的安全性。经Arnold变换后的信号采用时延相关法进行检测,不能检测出明显的相关峰。根据时延相关的结果,采用峰均比(Peak-to-Average Power Ratio, PAPR)检测,分析置乱信号的检测概率。与传统扩频信号相比,设计的信号波形在相同信噪比和检测门限条件下,具有更低的检测概率,抗截获性能更好。经过仿真验证可知,接收端根据Arnold反变换,恢复出包含有重要信息的原始信号,并且经过Arnold变化后的信号几乎不会造成误码率的波动和提升。
基金Project supported by the National Natural Science Foundation of China(Grant No.62075241).
文摘Single-pixel imaging(SPI)can transform 2D or 3D image data into 1D light signals,which offers promising prospects for image compression and transmission.However,during data communication these light signals in public channels will easily draw the attention of eavesdroppers.Here,we introduce an efficient encryption method for SPI data transmission that uses the 3D Arnold transformation to directly disrupt 1D single-pixel light signals and utilizes the elliptic curve encryption algorithm for key transmission.This encryption scheme immediately employs Hadamard patterns to illuminate the scene and then utilizes the 3D Arnold transformation to permutate the 1D light signal of single-pixel detection.Then the transformation parameters serve as the secret key,while the security of key exchange is guaranteed by an elliptic curve-based key exchange mechanism.Compared with existing encryption schemes,both computer simulations and optical experiments have been conducted to demonstrate that the proposed technique not only enhances the security of encryption but also eliminates the need for complicated pattern scrambling rules.Additionally,this approach solves the problem of secure key transmission,thus ensuring the security of information and the quality of the decrypted images.
文摘Arnold Bennett is well-known for his regional novels that mainly represent domestic quotidian lives of his pottery town,especially the lower and middle class.However,his infatuation with the hotel space implicates his ambition to re-situate his characters within the parameters of hotel and create new types of characters,representing in new ways the subjectivity of characters and their relations with material space.Based on his hotel writing,this article intends to re-conceive the historical reasons of his obsession with hotel space and further probe the modernity deflected by his representation of domestic selves and modern public identities in hotel space.
文摘Reversible data hiding is an information hiding technique that requires the retrieval of the error free cover image after the extraction of the secret image.We suggested a technique in this research that uses a recursive embedding method to increase capacity substantially using the Integer wavelet transform and the Arnold transform.The notion of Integer wavelet transforms is to ensure that all coefficients of the cover images are used during embedding with an increase in payload.By scrambling the cover image,Arnold transform adds security to the information that gets embedded and also allows embedding more information in each iteration.The hybrid combination of Integer wavelet transform and Arnold transform results to build a more efficient and secure system.The proposed method employs a set of keys to ensure that information cannot be decoded by an attacker.The experimental results show that it aids in the development of a more secure storage system and withstand few tampering attacks The suggested technique is tested on many image formats,including medical images.Various performance metrics proves that the retrieved cover image and hidden image are both intact.This System is proven to withstand rotation attack as well.
