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Some of the cryptographic algorithm has provided a promising solution which not only protects the data but also authenticates the systems and its participants, so the threat of various attacks is minimized. Nonetheless in the advancement of computing resources the cryptanalysis techniques also emerged and performing competitively in the field of information security with good results. In this paper, we have proposed the optimized deep neural network approach for cryptanalysis of symmetric encryption algorithm 64-bit DES (Data encryption standard). Our approach has used back propagation technique with multiple hidden layers and advanced activation function also we have addressed the problem of vanishing gradient. Further, the implementation results show that we have achieved 90% accuracy which is significantly higher as compared to previous approaches. We have also compared the proposed technique with the existing ones against three parameters i.e. time, loss, accuracy.<\/jats:p>","DOI":"10.3233\/jifs-179679","type":"journal-article","created":{"date-parts":[[2020,3,3]],"date-time":"2020-03-03T09:55:15Z","timestamp":1583229315000},"page":"5921-5931","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":13,"title":["Optimized deep neural network for cryptanalysis of DES"],"prefix":"10.1177","volume":"38","author":[{"given":"Ankit","family":"Mundra","sequence":"first","affiliation":[{"name":"Department of Information Technology, School of Computing and IT, Manipal University Jaipur, Dehmi Kalan, Near GVK Toll Plaza, Jaipur, Rajasthan, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shikha","family":"Mundra","sequence":"additional","affiliation":[{"name":"Department of Computer Science and Engineering, School of Computing and IT, Manipal University Jaipur, Dehmi Kalan, Near GVK Toll Plaza, Jaipur, Rajasthan, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jai Shanker","family":"Srivastava","sequence":"additional","affiliation":[{"name":"Department of Information Technology, School of Computing and IT, Manipal University Jaipur, Dehmi Kalan, Near GVK Toll Plaza, Jaipur, Rajasthan, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Punit","family":"Gupta","sequence":"additional","affiliation":[{"name":"Department of Computer and Communication Engineering, Manipal University Jaipur Dehmi Kalan, Near GVK Toll Plaza, Jaipur, Rajasthan, India"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2020,2,29]]},"reference":[{"key":"e_1_3_1_2_2","doi-asserted-by":"publisher","DOI":"10.9790\/0661-16350105"},{"issue":"2","key":"e_1_3_1_3_2","first-page":"166","article-title":"Cryptanalysis of modern cryptographic algorithms","volume":"1","author":"Neetu Settia","year":"2010","unstructured":"NeetuSettia, Cryptanalysis of modern cryptographic algorithms, International Journal of Computer Science and Technology1(2) (2010), 166\u2013169.","journal-title":"International Journal of Computer Science and Technology"},{"issue":"1","key":"e_1_3_1_4_2","first-page":"55","article-title":"An overview of modern cryptography","volume":"1","author":"Al-Vahed A.","year":"2011","unstructured":"Al-VahedA. and SahhaviH., An overview of modern cryptography, World Applied Programming1(1) (2011), 55\u201361.","journal-title":"World Applied Programming"},{"issue":"5","key":"e_1_3_1_5_2","first-page":"8","article-title":"A review on cryptography, attacks and cyber security","volume":"8","author":"Shree D.","year":"2017","unstructured":"ShreeD., A review on cryptography, attacks and cyber security, International Journal of Advanced Research in Computer Science8(5) (2017), 8\u201315.","journal-title":"International Journal of Advanced Research in Computer Science"},{"issue":"2","key":"e_1_3_1_6_2","first-page":"287","article-title":"A survey report on various cryptanalysis techniques","volume":"3","author":"Kendhe A.K.","year":"2013","unstructured":"KendheA.K. and AgrawalH., A survey report on various cryptanalysis techniques, International Journal of Soft Computing and Engineering3(2) (2013), 287\u2013293.","journal-title":"International Journal of Soft Computing and Engineering"},{"key":"e_1_3_1_7_2","unstructured":"EbrahimM. 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