scholarly journals Chaotic Image Encryption Design Using Tompkins-Paige Algorithm

2009 ◽  
Vol 2009 ◽  
pp. 1-22 ◽  
Author(s):  
Shahram Etemadi Borujeni ◽  
Mohammad Eshghi
Keyword(s):  
Image Encryption ◽  
Logistic Map ◽  
Correlation Coefficients ◽  
Chi Square ◽  
Encrypted Image ◽  
Key Space ◽  
Chi Square Test ◽  
Plain Image ◽  
The Difference ◽  
Pixel Substitution

In this paper, we have presented a new permutation-substitution image encryption architecture using chaotic maps and Tompkins-Paige algorithm. The proposed encryption system includes two major parts, chaotic pixels permutation and chaotic pixels substitution. A logistic map is used to generate a bit sequence, which is used to generate pseudorandom numbers in Tompkins-Paige algorithm, in 2D permutation phase. Pixel substitution phase includes two process, the tent pseudorandom image (TPRI) generator and modulo addition operation. All parts of the proposed chaotic encryption system are simulated. Uniformity of the histogram of the proposed encrypted image is justified using the chi-square test, which is less than (255, 0.05). The vertical, horizontal, and diagonal correlation coefficients, as well as their average and RMS values for the proposed encrypted image are calculated that is about 13% less than previous researches. To quantify the difference between the encrypted image and the corresponding plain-image, three measures are used. These are MAE, NPCR, and UACI, which are improved in our proposed system considerably. NPCR of our proposed system is exactly the ideal value of this criterion. The key space of our proposed method is large enough to protect the system against any Brute-force and statistical attacks.

scholarly journals Cryptographic Algorithm Using Newton-Raphson Method and General Bischi-Naimzadah Duopoly System

Entropy ◽  
2020 ◽  
Vol 23 (1) ◽  
pp. 57
Author(s):  
Abdelrahman Karawia
Keyword(s):  
Image Encryption ◽  
Statistical Tests ◽  
Robustness Analysis ◽  
Correlation Coefficients ◽  
Cryptographic Algorithm ◽  
Key Space ◽  
Plain Image ◽  
Excellent Method ◽  
Current Article ◽  
Differential Attacks

Image encryption is an excellent method for the protection of image content. Most authors used the permutation-substitution model to encrypt/decrypt the image. Chaos-based image encryption methods are used in this model to shuffle the rows/columns and change the pixel values. In parallel, authors proposed permutation using non-chaotic methods and have displayed good results in comparison to chaos-based methods. In the current article, a new image encryption algorithm is designed using combination of Newton-Raphson’s method (non-chaotic) and general Bischi-Naimzadah duopoly system as a hyperchaotic two-dimensional map. The plain image is first shuffled by using Newton-Raphson’s method. Next, a secret matrix with the same size of the plain image is created using general Bischi-Naimzadah duopoly system. Finally, the XOR between the secret matrix and the shuffled image is calculated and then the cipher image is obtained. Several security experiments are executed to measure the efficiency of the proposed algorithm, such as key space analysis, correlation coefficients analysis, histogram analysis, entropy analysis, differential attacks analysis, key sensitivity analysis, robustness analysis, chosen plaintext attack analysis, computational analysis, and NIST statistical Tests. Compared to many recent algorithms, the proposed algorithm has good security efficiency.

scholarly journals Self-Adaptive Image Encryption Algorithm Based on Quantum Logistic Map

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Youxia Dong ◽  
Xiaoling Huang ◽  
Qixiang Mei ◽  
Yuanju Gan
Keyword(s):  
Image Encryption ◽  
Random Sequence ◽  
Logistic Map ◽  
Correlation Coefficients ◽  
Iteration Process ◽  
Encryption Algorithm ◽  
Random Sequences ◽  
Plain Image ◽  
Image Encryption Algorithm ◽  
Self Adaptive

This study proposes a self-adaptive image encryption algorithm based on the quantum logistic map. First, the initial values are substituted into the quantum logistic map based on an iteration process to generate three random sequences. After preprocessing, three new random sequences with better randomicity were obtained from the generated random sequences. In particular, the correlation coefficients for random sequences before and after preprocessing are compared to determine the best model to make the correlation coefficients closer to zero. Second, one random sequence in the scrambling stage is selected with respect to the plain image. The selected random sequence is then used to perform row-column perturbation on the plain image. Finally, the remaining two random sequences are used to perform forward and reverse diffusion to obtain the final cipher image. Because of the dependence on the plain image, the algorithm can frustrate the chosen-plaintext and known-plaintext attacks. Experimental results show that the proposed encryption algorithm can achieve secure communications.

Image Encryption Algorithm Based on a Hyperchaotic System and Fractional Fourier Transform

2019 ◽  
Vol 23 (5) ◽  
pp. 805-809
Author(s):  
Yang Liu ◽  
Keyword(s):  
Fourier Transform ◽  
Image Encryption ◽  
Fractional Fourier Transform ◽  
Correlation Coefficients ◽  
Hyperchaotic System ◽  
Secret Key ◽  
Encrypted Image ◽  
Key Space ◽  
Highly Sensitive ◽  
Image Encryption Algorithm

An image encryption scheme that combines a hyperchaotic system with standard weighted fractional Fourier transform theory is proposed. Simulation results showed that grayscale distribution of the encrypted image was balanced, correlation coefficients of adjacent pixels were highly irrelevant, and the encrypted image was highly sensitive to the secret key, offering good robustness against attacks and a larger key space.

scholarly journals Batch Image Encryption Using Generated Deep Features Based on Stacked Autoencoder Network

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Fei Hu ◽  
Jingyuan Wang ◽  
Xiaofei Xu ◽  
Changjiu Pu ◽  
Tao Peng
Keyword(s):  
Image Encryption ◽  
Logistic Map ◽  
Time Estimation ◽  
Differential Attack ◽  
Encrypted Image ◽  
Stacked Autoencoder ◽  
Encryption Schemes ◽  
Plain Image ◽  
Brute Force Attack ◽  
The Relationship

Chaos-based algorithms have been widely adopted to encrypt images. But previous chaos-based encryption schemes are not secure enough for batch image encryption, for images are usually encrypted using a single sequence. Once an encrypted image is cracked, all the others will be vulnerable. In this paper, we proposed a batch image encryption scheme into which a stacked autoencoder (SAE) network was introduced to generate two chaotic matrices; then one set is used to produce a total shuffling matrix to shuffle the pixel positions on each plain image, and another produces a series of independent sequences of which each is used to confuse the relationship between the permutated image and the encrypted image. The scheme is efficient because of the advantages of parallel computing of SAE, which leads to a significant reduction in the run-time complexity; in addition, the hybrid application of shuffling and confusing enhances the encryption effect. To evaluate the efficiency of our scheme, we compared it with the prevalent “logistic map,” and outperformance was achieved in running time estimation. The experimental results and analysis show that our scheme has good encryption effect and is able to resist brute-force attack, statistical attack, and differential attack.

Determining the Role of Customer Satisfaction in Gaining Customer Loyalty among Cafés

2020 ◽  
Vol 8 (1) ◽  
pp. 74-85
Author(s):  
Allen Joshua P. Cuñado ◽  
Cathlyn Mae Painagan ◽  
Jeshnin Ann L. Cuñado ◽  
Ella Marie D. Palmada ◽  
Zenar Jane A. Mumar ◽  
...  
Keyword(s):  
Customer Satisfaction ◽  
Customer Loyalty ◽  
Pearson Correlation ◽  
Correlation Coefficients ◽  
Significant Degree ◽  
Business Success ◽  
Research Approach ◽  
Chi Square ◽  
Chi Square Test

Café as an establishment primarily sells refreshing drinks, snacks, and light meals, with coffee being their flagship product. This type of business is steadily multiplying around the city of Tagbilaran, Bohol, Philippines. Customers have linked to business success as well as customer satisfaction and customer loyalty. This study was implemented to analyze the role of customers’ satisfaction in gaining customers’ loyalty, specifically among purposively selected cafés. The quantitative method of research approach was used with the aid of questionnaires. The data gathered were statistically treated making use of frequency, composite means, weighted mean, chi-square test, and Pearson correlation coefficients. The respondents included 210 customers from the purposively selected cafés. Results showed respondents to be very satisfied (VS) for the Product; for the price; for the place; for the service quality; and moderately satisfied (MS) for promotion. Results further showed that there is a significant degree of relationship between customer satisfaction and customer loyalty.

Performance of Abbreviated Protocols Versus Unenhanced MRI in Detecting Occult Breast Lesions of Mammography in Patients with Dense Breasts

2021 ◽  
Author(s):  
Suhong Zhao ◽  
Peipei Chen ◽  
Guangrui Shao ◽  
Baijie Li ◽  
Huikun Zhang ◽  
...  
Keyword(s):  
Reading Time ◽  
Area Under The Curve ◽  
Lesion Size ◽  
Lower Sensitivity ◽  
Chi Square ◽  
Dense Breast Tissue ◽  
Negative Findings ◽  
Chi Square Test ◽  
The Difference ◽  
Sensitivity Specificity

Abstract Objective: To assess the diagnostic ability of abbreviated protocols of MRI (AP-MRI) compared with unenhanced MRI (UE-MRI) in mammographically occult cancers in patients with dense breast tissue.Materials and Methods: The retrospective analysis consisted of 102 patients without positive findings on mammography who received preoperative MRI full diagnostic protocols (FDP) between January 2015 and December 2018. Two breast radiologists read the UE, AP, and FDP. The interpretation times were recorded. The comparisons of the sensitivity, specificity and area under the curve of each MRI protocol, and the sensitivity of these protocols in each subgroup of different size tumors used the Chi-square test. The paired sample t-test was used for evaluating the difference of reading time of the three protocols.Results: Among 102 women, there were 68 cancers and two benign lesions in 64 patients and 38 patients had benign or negative findings. Both readers found the sensitivity and specificity of AP and UE-MRI were similar (p>0.05), whereas compared with FDP, UE had lower sensitivity (Reader 1/Reader 2: p=0.023, 0.004). For different lesion size groups, one of the readers found that AP and FDP had higher sensitivities than UE-MRI for detecting the lesions ≤10 mm in diameter (p=0.041, p=0.023). Compared with FDP, the average reading time of UE-MRI and AP was remarkably reduced (p < 0.001).Conclusion: AP-MRI had more advantages than UE-MRI to detect mammographically occult cancers, especially for breast tumors ≤10 mm in diameter.

Abstract 14721: Impact of Covid-19 on Cardiology Consultation in Tertiary Care Hospital of a Developing Country

Circulation ◽  
2020 ◽  
Vol 142 (Suppl_3) ◽  
Author(s):  
ghufran adnan ◽  
Osman Faheem ◽  
Maria Khan ◽  
Pirbhat Shams ◽  
Jamshed Ali
Keyword(s):  
Emergency Department ◽  
Tertiary Care ◽  
Reduction Rate ◽  
Care Hospital ◽  
Chi Square ◽  
Coronary Syndrome ◽  
Significant Difference ◽  
Drastic Increase ◽  
Chi Square Test ◽  
The Difference

Introduction: COVID-19 pandemic has overwhelmed the healthcare system of Pakistan. There has been observation regarding changes in pattern of patient presentation to emergency department (ED) for all diseases particularly cardiovascular. The aim of the study is to investigate these changes in cardiology consultations and compare pre-COVID-19 and COVID-19 era. Hypothesis: There is a significant difference in cardiology consultations during COVID era as compared to non-COVID era. Method: We collected data retrospectively of consecutive patients who visited emergency department (ED) during March-April 2019 (non-COVID era) and March-April 2020 (COVID era). Comparison has been made to quantify the differences in clinical characteristics, locality, admission, type, number, and reason of Cardiology consults generated. Results: We calculated the difference of 1351 patients between COVID and non-COVID era in terms of cardiology consults generated from Emergency department, using Chi-square test. Out of which 880 (59%) are male with mean age of 61(SD=15). Analysis shows pronounced augmentation in number of comorbidities [Hypertension(6%), Chronic kidney disease (6%), Diabetes (5%)] but there was 36% drop in total cardiology consultations and 43% reduction rate in patient’s ED visit from other cities during COVID era. There was 60% decrease in acute coronary syndrome presentation in COVID era, but fortuitously drastic increase (30%) in type II myocardial injury has been noted. Conclusion: There is a remarkable decline observed in patients presenting with cardiac manifestations during COVID era. Lack in timely care could have a pernicious impact on outcomes, global health care organizations should issue directions to adopt telemedicine services in underprivileged areas to provide timely care to cardiac patients.

scholarly journals Efficacy of 4% chlorhexidine in preventing neonatal umbilical cord infection

2020 ◽  
Vol 14 (03) ◽  
pp. 136-139
Author(s):  
Fouzia Ishaq ◽  
Anila Jamil ◽  
Muhammad Sajjad ◽  
Maria Iftikhar ◽  
Muhammad Adnan Zafar ◽  
...  
Keyword(s):  
Umbilical Cord ◽  
Analytical Study ◽  
Bacterial Colonization ◽  
Neonatal Morbidity ◽  
Chi Square ◽  
Once Daily ◽  
Group 4 ◽  
Chi Square Test ◽  
The Difference ◽  
Random Method

Background: Umbilical cord stump is a budding point for bacterial colonization subsequently leading to sepsis that contributes to high neonatal morbidity and mortality, if not properly managed. Antiseptic care can significantly reduce omphalitis and ultimately improve newborn survival. Objective of this study was to see the efficacy of 4% chlorhexidine use to prevent umbilical cord infection in neonates.Subjects and methods: It was a comparative analytical study conducted in Neonatal unit, Sir Ganga Ram Hospital (SGRH) Lahore from July, 2016 till January, 2017. One hundred neonates were enrolled and randomized into two equal group by simple random method (50 each). In one group, nothing was applied to cord while in chlorhexidine group, 4% chlorhexidine gel was applied on umbilicus and around it, once daily for 7 days or till cord detached whichever came early. First application was done by a nurse followed by duly trained mother/caregiver. The signs of omphalitis (redness, pus or localized oedema) were observed and recorded for each neonate in both groups. Chi square test was used to see the difference in omphalitis in these groups with p˂ 0.05 considered as statistically significant result.Results: Out of 100 neonates, 29 (58%) and 23 (46%) males while 21 (42%) and 27 (54%) females neonates belonged to dry care and chlorhexidine group respectively. Nineteen (38%) neonates with dry cord had omphalitis compared to only 5 (10%) in chlorhexidine group (p 0.001). Neonates with chlorhexidine application showed prolonged mean cord separation time (7.9±1.5 days) compared to dry care (6.1±1.8 days). Conclusion: The use of 4% Chlorhexidine was effective to lower omphalitis compared to neonates with dry cord care.

scholarly journals PERBEDAAN SUHU TUBUH BAYI BARU LAHIR ANTARA BAYI YANG BERHASIL MELAKUKAN INISIASI MENYUSU DINI DAN BAYI YANG TIDAK BERHASIL MELAKUKAN INISIASI MENYUSU DINI

2019 ◽  
Vol 2 (2) ◽  
pp. 133
Author(s):  
Aprilia Aprisanti Reyani
Keyword(s):  
Body Temperature ◽  
Random Sampling ◽  
Statistical Tests ◽  
The Body ◽  
Breastfeeding Initiation ◽  
Chi Square ◽  
Cross Sectional ◽  
Chi Square Test ◽  
The Difference ◽  
Cross Sectional Design

Latar Belakang :Kehangatan dada ibu dapat menghangatkan bayi, sehingga apabila bayi diletakan di dada ibunya segera setelah melahirkan atau dilakukan Inisiasi Menyusu Dini, dapat menurunkan resiko hipotermia dan menurunkan kematian bayi baru lahir akibat kedinginan atau hipotermia. Tujuan : Tujuan dari penelitian ini adalah untuk mengetahui perbedaan suhu tubuh bayi baru lahir antara bayi yang berhasil melakukan IMD dan bayi yang tidak berhasil melakukan IMD Metode  :Analitik,desain cross sectional,populasi semua bayi baru lahir, sampel bayi barulahir, teknik Non Random Sampling, pengumpulan data dengan menggunakan Lembar Observasi dengan menggunakan uji Chi-Square dengan nilai signifikan α = 0.05 yaitu bila hasil uji statistik menunjukan p ≤ α maka H0 ditolak. Hasil      :Suhu tubuh bayi baru lahir yang berhasil melakukan IMD sebagianbesardengansuhutubuhtidakhipotermisebanyak 20 bayi (87%) Suhu tubuh bayi baru lahir yang tidak berhasil melakukan IMD sebagianbesardengansuhutubuhhipotermisebanyak 8 bayi (66,7%). Dari hasil uji statistik diperoleh hasil nilai p = 0,005 < α = 0.05 maka H1 diterima, artinya ada Perbedaan suhu tubuh bayi baru lahir yang berhasil melakukan IMD dan yang tidak berhasil melakukan IMD Kesimpulan :Terdapat perbedaan suhu tubuh bayi baru lahir antara bayi yang berhasil melakukan IMD dan bayi yang tidak berhasil melakukan IMD.   Kata kunci : Inisiasi Menyusu Dini, Suhu Tubuh Bayi Baru Lahir                                                                                               THE DIFFERENCE BODY TEMPERATURE BETWEEN BABIES WHO SUCCESSFULLY INITIATE BREASTFEEDING EARLY AND BABIESWHO FAIL TO INITIATE EARLY BREASTFEEDING AT RSIA KIRANA SIDOARJO 2019  Background : The warmth of the mother’s chest can warm the baby, so that when the baby is in the mother’s breast immediately after birth or initiated early breastfeeding can reduce the mortality rate of newborns due to hypotermia.Purpose :the purpose of this study was to determine the difference in body temperature of newborns between infants who successfully initiated early breastfeeding and infants who did not succeed in initiating early breastfeedingMethods : analytical, cross sectional design, population 40 newborns, samples 35 newborns, Non Random Sampling techniques, the data accumulation using observation sheets and using chi-square test, with significant value α = 0.05 is when the statistical test results show p ≤ α then Ho is rejected.Result : The body temperature of the newborn who succeeded in initiating early breastfeeding was 36.78ºC with 23 (65.7%) of infants none having hypothermia, the newborn baby's body temperature that did not succeed in doing this early breastfeeding was 35.78ºC With 8 infants experiencing hypothermia, while 4 babies with normal temperature. From the results of statistical tests obtained results with the value p = 0,000 <α = 0.05 then H1 accepted, meaning there is a difference in body temperature of a newborn who successfully initiated early breastfeeding and who did not succeed in Early Breastfeeding Initiation. Conclusion : There is a difference in the body temperature of a newborn between infants who successfully initiated breastfeeding and infants who are not successful in initiating early breastfeeding....Keywords : Early breastfeedinginitiation, newborns temperature

scholarly journals The effectiveness of acetic acid wash protocol and the interpretation patterns of blood contaminated cervical cytology ThinPrep® specimens

CytoJournal ◽  
2015 ◽  
Vol 12 ◽  
pp. 23 ◽  
Author(s):  
Nora K. Frisch ◽  
Yasin Ahmed ◽  
Seema Sethi ◽  
Daniel Neill ◽  
Tatyana Kalinicheva ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Statistical Significance ◽  
Cervical Cytology ◽  
Low Grade ◽  
Squamous Intraepithelial Lesions ◽  
Chi Square ◽  
Chi Square Test ◽  
Acid Wash ◽  
The Difference ◽  
Intraepithelial Lesions

Background: ThinPrep® (TP) cervical cytology, as a liquid-based method, has many benefits but also a relatively high unsatisfactory rate due to debris/lubricant contamination and the presence of blood. These contaminants clog the TP filter and prevent the deposition of adequate diagnostic cells on the slide. An acetic acid wash (AAW) protocol is often used to lyse red blood cells, before preparing the TP slides. Design: From 23,291 TP cervical cytology specimens over a 4-month period, 2739 underwent AAW protocol due to initial unsatisfactory smear (UNS) with scant cellularity due to blood or being grossly bloody. Randomly selected 2739 cervical cytology specimens which did not undergo AAW from the same time period formed the control (non-AAW) group. Cytopathologic interpretations of AAW and non-AAW groups were compared using the Chi-square test. Results: About 94.2% of the 2739 cases which underwent AAW were subsequently satisfactory for evaluation with interpretations of atypical squamous cells of undetermined significance (ASCUS) 4.9% (135), low-grade squamous intraepithelial lesions (LSIL) 3.7% (102), and high-grade squamous intraepithelial lesions (HSIL) 1% (28). From the 2739 control cases, 96.3% were satisfactory with ASCUS 5.5% (151), LSIL 5.1% (139), and HSIL 0.7% (19). The prevalence of ASCUS interpretations was similar (P = 0.33). Although there were 32% more HSIL interpretations in the AAW group (28 in AAW vs. 19 in non-AAW), the difference was statistically insignificant (P = 0.18). AAW category; however, had significantly fewer LSIL interpretations (P = 0.02). The percentage of UNS cases remained higher in the AAW group with statistical significance (P < 0.01). Conclusions: While AAW had a significantly higher percent of UNS interpretations, the protocol was effective in rescuing 94.2% of specimens which otherwise may have been reported unsatisfactory. This improved patient care by avoiding a repeat test. The prevalence of ASCUS and HSIL interpretations between AAW and non-AAW groups were comparable. Though not statistically significant, HSIL interpretations were relatively higher in the AAW group. LSIL interpretations showed lower prevalence in AAW group.

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