{"id":195,"date":"2018-07-23T07:35:34","date_gmt":"2018-07-23T07:35:34","guid":{"rendered":"http:\/\/csp11.epgpbooks.inflibnet.ac.in\/?post_type=chapter&#038;p=195"},"modified":"2018-12-27T11:22:15","modified_gmt":"2018-12-27T11:22:15","slug":"simplified-des","status":"publish","type":"chapter","link":"https:\/\/ebooks.inflibnet.ac.in\/csp11\/chapter\/simplified-des\/","title":{"rendered":"Simplified DES"},"content":{"raw":"<div><span style=\"float: right\"><a href=\"https:\/\/youtu.be\/Bkns-lZc944\" target=\"_blank\" rel=\"noopener\"><img src=\"http:\/\/epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/2018\/11\/download.png\" alt=\"epgp books\" width=\"75px\" height=\"75px;\" \/><\/a>\r\n<\/span><\/div>\r\n&nbsp;\r\n\r\n&nbsp;\r\n\r\n<strong>Objectives<\/strong>\r\n\r\n&nbsp;\r\n<ul>\r\n \t<li>To discuss about the basis of Simplified Data Encryption Standard (DES).<\/li>\r\n \t<li>To understand the working of S-DES<\/li>\r\n \t<li>To learn the Key generation process in S-DES<\/li>\r\n<\/ul>\r\n<div>\r\n\r\n<strong>1.\u00a0 Introduction<\/strong>\r\n\r\n&nbsp;\r\n<p style=\"text-align: justify\">Data Encryption Standards became a federal standard in November 1976. S-DES is a simplified version of the well-known DES (Data Encryption Standard) algorithm. It closely resembles the real thing, with smaller parameters, to facilitate operation by hand for pedagogical purposes. It is not intended as a real encryption tool, rather as a teaching tool. All conventional encryption algorithms are based on two kinds of manipulation of the data: substitution and permutation. In substitution, each element of the plaintext is mapped into another element and in permutation, the elements in the plaintext are rearranged. Permutation is also called transposition.<\/p>\r\n\r\n<\/div>\r\n<p style=\"text-align: justify\">8 bits block with a 10 bits key is used in S-DES. The encryption process consists of Initial Permutation, Function fk1, Switch of the key halves, Function fk2, Final Permutation (inverse of initial permutation).<\/p>\r\n&nbsp;\r\n<p style=\"text-align: justify\">Key generation process do the following steps like First Initial permutation P10, Divide in left and right parts then Left shift and merge 8 bits permutation, resulting in a 8 bits K1.Then divide in left and right parts, double left shift and Merge an 8 bits permutation, resulting in a 8 bits K2<\/p>\r\n&nbsp;\r\n<ul>\r\n \t<li><strong>Example of key generation<\/strong>:\r\n<ul>\r\n \t<li>Key: 1010000010<\/li>\r\n \t<li>P10: 1000001100<\/li>\r\n \t<li>Split: 10000 01100<\/li>\r\n \t<li>Lshift: 00001 11000<\/li>\r\n \t<li>P8: 10100100\u00a0 K1<\/li>\r\n \t<li>2 Lshift: 00100 00011<\/li>\r\n \t<li>P8: 01000011\u00a0 K2<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n2.<strong>Structure of S-P boxes<\/strong>\r\n\r\n<strong>\u00a0<\/strong>\r\n\r\nThe following gives structure of S-P boxes in Simplified DES\r\n\r\n<strong>S-Box<\/strong>\r\n<p style=\"text-align: center\"><img class=\"alignnone size-full wp-image-196\" src=\"http:\/\/csp11.epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-32.jpg\" alt=\"\" width=\"240\" height=\"260\" \/><\/p>\r\n<img class=\"size-full wp-image-197 alignleft\" src=\"http:\/\/csp11.epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-33.jpg\" alt=\"\" width=\"465\" height=\"165\" \/><img class=\"size-full wp-image-198 alignleft\" src=\"http:\/\/csp11.epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-34.jpg\" alt=\"\" width=\"378\" height=\"204\" \/>\r\n<ul>\r\n \t<li><strong>Initial Permutation<\/strong><\/li>\r\n<\/ul>\r\n<p style=\"text-align: justify\">S-DES involves several fixed operations involving particular permutations or other kinds of operators. It starts by using the following<\/p>\r\n&nbsp;\r\n<p style=\"text-align: justify\">8-bit permutation, its \"initial permutation,\" hence dubbed IP<strong>:<\/strong><\/p>\r\n&nbsp;\r\n\r\n<img class=\"size-full wp-image-199 alignleft\" src=\"http:\/\/csp11.epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-35.jpg\" alt=\"\" width=\"351\" height=\"65\" \/>\r\n<div>\r\n\r\n&nbsp;\r\n\r\n&nbsp;\r\n\r\n&nbsp;\r\n<p style=\"text-align: justify\">S-DES uses an \"expansion\" permutation whereby 2 separate permutations are applied to a 4-bit number, and the 2 results pasted together to form an 8-bit final output.<\/p>\r\n\r\n<\/div>\r\n<img class=\"alignnone size-full wp-image-200\" src=\"http:\/\/csp11.epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-36.jpg\" alt=\"\" width=\"661\" height=\"96\" \/>\r\n<ul>\r\n \t<li>And it uses two so-called s-boxes, S0 and S1.<\/li>\r\n \t<li>S0 is :<\/li>\r\n<\/ul>\r\n<img class=\"alignnone size-full wp-image-201\" src=\"http:\/\/csp11.epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-37.jpg\" alt=\"\" width=\"781\" height=\"217\" \/>\r\n<ul>\r\n \t<li>And here is S1:<\/li>\r\n<\/ul>\r\n<img class=\"alignnone size-full wp-image-206\" src=\"http:\/\/csp11.epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/sites\/55\/2018\/07\/Untitled-1.png\" alt=\"\" width=\"495\" height=\"133\" \/>\r\n\r\n&nbsp;\r\n\r\nThe function F is taken from S0 and S1, such as:R is expanded by E,The expansion is xored with the subkey\r\n\r\n&nbsp;\r\n<p style=\"text-align: justify\">Finally, it uses a swap operation called SW, wherein the right and left 4 bits of a byte are swapped. This is a permutation, and can be represented as such The first 4 bits are the input for S0 the last are input to S1<\/p>\r\n&nbsp;\r\n\r\n<img class=\"size-full wp-image-207 aligncenter\" src=\"http:\/\/csp11.epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-42.jpg\" alt=\"\" width=\"295\" height=\"68\" \/>\r\n<p style=\"text-align: justify\">If the input is I1I2I3I4, then I1I3 is the row to consider and I2I3 is the column. The<\/p>\r\n<p style=\"text-align: justify\">output\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 goes\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 then\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 through\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 P4.<\/p>\r\n&nbsp;\r\n\r\n<img class=\"alignnone size-full wp-image-208\" src=\"http:\/\/csp11.epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-43.jpg\" alt=\"\" width=\"439\" height=\"543\" \/>\r\n\r\n&nbsp;\r\n\r\n<strong>Summary<\/strong>\r\n\r\n&nbsp;\r\n\r\nOutlined the Simplified DES algorithm and discussed the encryption process in S- DES.\r\n<table>\r\n<tbody>\r\n<tr>\r\n<td><strong>you can view video on Simplified DES<\/strong><\/td>\r\n<td><a href=\"https:\/\/youtu.be\/Bkns-lZc944\" target=\"_blank\" rel=\"noopener\"><img class=\"alignnone wp-image-120\" src=\"http:\/\/epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/2018\/11\/download.png\" alt=\"\" width=\"36\" height=\"36\" \/><\/a><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n\r\n<img class=\"alignnone size-full wp-image-209 aligncenter\" src=\"http:\/\/csp11.epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-44.jpg\" alt=\"\" width=\"531\" height=\"360\" \/>","rendered":"<div><span style=\"float: right\"><a href=\"https:\/\/youtu.be\/Bkns-lZc944\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" src=\"http:\/\/epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/2018\/11\/download.png\" alt=\"epgp books\" width=\"75px\" height=\"75px;\" \/><\/a><br \/>\n<\/span><\/div>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Objectives<\/strong><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li>To discuss about the basis of Simplified Data Encryption Standard (DES).<\/li>\n<li>To understand the working of S-DES<\/li>\n<li>To learn the Key generation process in S-DES<\/li>\n<\/ul>\n<div>\n<p><strong>1.\u00a0 Introduction<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify\">Data Encryption Standards became a federal standard in November 1976. S-DES is a simplified version of the well-known DES (Data Encryption Standard) algorithm. It closely resembles the real thing, with smaller parameters, to facilitate operation by hand for pedagogical purposes. It is not intended as a real encryption tool, rather as a teaching tool. All conventional encryption algorithms are based on two kinds of manipulation of the data: substitution and permutation. In substitution, each element of the plaintext is mapped into another element and in permutation, the elements in the plaintext are rearranged. Permutation is also called transposition.<\/p>\n<\/div>\n<p style=\"text-align: justify\">8 bits block with a 10 bits key is used in S-DES. The encryption process consists of Initial Permutation, Function fk1, Switch of the key halves, Function fk2, Final Permutation (inverse of initial permutation).<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify\">Key generation process do the following steps like First Initial permutation P10, Divide in left and right parts then Left shift and merge 8 bits permutation, resulting in a 8 bits K1.Then divide in left and right parts, double left shift and Merge an 8 bits permutation, resulting in a 8 bits K2<\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><strong>Example of key generation<\/strong>:\n<ul>\n<li>Key: 1010000010<\/li>\n<li>P10: 1000001100<\/li>\n<li>Split: 10000 01100<\/li>\n<li>Lshift: 00001 11000<\/li>\n<li>P8: 10100100\u00a0 K1<\/li>\n<li>2 Lshift: 00100 00011<\/li>\n<li>P8: 01000011\u00a0 K2<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>2.<strong>Structure of S-P boxes<\/strong><\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p>The following gives structure of S-P boxes in Simplified DES<\/p>\n<p><strong>S-Box<\/strong><\/p>\n<p style=\"text-align: center\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-196\" src=\"http:\/\/csp11.epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-32.jpg\" alt=\"\" width=\"240\" height=\"260\" srcset=\"https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-32.jpg 240w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-32-65x70.jpg 65w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-32-225x244.jpg 225w\" sizes=\"auto, (max-width: 240px) 100vw, 240px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-197 alignleft\" src=\"http:\/\/csp11.epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-33.jpg\" alt=\"\" width=\"465\" height=\"165\" srcset=\"https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-33.jpg 465w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-33-300x106.jpg 300w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-33-65x23.jpg 65w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-33-225x80.jpg 225w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-33-350x124.jpg 350w\" sizes=\"auto, (max-width: 465px) 100vw, 465px\" \/><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-198 alignleft\" src=\"http:\/\/csp11.epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-34.jpg\" alt=\"\" width=\"378\" height=\"204\" srcset=\"https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-34.jpg 378w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-34-300x162.jpg 300w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-34-65x35.jpg 65w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-34-225x121.jpg 225w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-34-350x189.jpg 350w\" sizes=\"auto, (max-width: 378px) 100vw, 378px\" \/><\/p>\n<ul>\n<li><strong>Initial Permutation<\/strong><\/li>\n<\/ul>\n<p style=\"text-align: justify\">S-DES involves several fixed operations involving particular permutations or other kinds of operators. It starts by using the following<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify\">8-bit permutation, its &#8220;initial permutation,&#8221; hence dubbed IP<strong>:<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-199 alignleft\" src=\"http:\/\/csp11.epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-35.jpg\" alt=\"\" width=\"351\" height=\"65\" srcset=\"https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-35.jpg 351w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-35-300x56.jpg 300w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-35-65x12.jpg 65w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-35-225x42.jpg 225w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-35-350x65.jpg 350w\" sizes=\"auto, (max-width: 351px) 100vw, 351px\" \/><\/p>\n<div>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify\">S-DES uses an &#8220;expansion&#8221; permutation whereby 2 separate permutations are applied to a 4-bit number, and the 2 results pasted together to form an 8-bit final output.<\/p>\n<\/div>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-200\" src=\"http:\/\/csp11.epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-36.jpg\" alt=\"\" width=\"661\" height=\"96\" srcset=\"https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-36.jpg 661w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-36-300x44.jpg 300w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-36-65x9.jpg 65w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-36-225x33.jpg 225w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-36-350x51.jpg 350w\" sizes=\"auto, (max-width: 661px) 100vw, 661px\" \/><\/p>\n<ul>\n<li>And it uses two so-called s-boxes, S0 and S1.<\/li>\n<li>S0 is :<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-201\" src=\"http:\/\/csp11.epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-37.jpg\" alt=\"\" width=\"781\" height=\"217\" srcset=\"https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-37.jpg 781w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-37-300x83.jpg 300w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-37-768x213.jpg 768w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-37-65x18.jpg 65w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-37-225x63.jpg 225w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-37-350x97.jpg 350w\" sizes=\"auto, (max-width: 781px) 100vw, 781px\" \/><\/p>\n<ul>\n<li>And here is S1:<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-206\" src=\"http:\/\/csp11.epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/sites\/55\/2018\/07\/Untitled-1.png\" alt=\"\" width=\"495\" height=\"133\" srcset=\"https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Untitled-1.png 495w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Untitled-1-300x81.png 300w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Untitled-1-65x17.png 65w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Untitled-1-225x60.png 225w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Untitled-1-350x94.png 350w\" sizes=\"auto, (max-width: 495px) 100vw, 495px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>The function F is taken from S0 and S1, such as:R is expanded by E,The expansion is xored with the subkey<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify\">Finally, it uses a swap operation called SW, wherein the right and left 4 bits of a byte are swapped. This is a permutation, and can be represented as such The first 4 bits are the input for S0 the last are input to S1<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-207 aligncenter\" src=\"http:\/\/csp11.epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-42.jpg\" alt=\"\" width=\"295\" height=\"68\" srcset=\"https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-42.jpg 295w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-42-65x15.jpg 65w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-42-225x52.jpg 225w\" sizes=\"auto, (max-width: 295px) 100vw, 295px\" \/><\/p>\n<p style=\"text-align: justify\">If the input is I1I2I3I4, then I1I3 is the row to consider and I2I3 is the column. The<\/p>\n<p style=\"text-align: justify\">output\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 goes\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 then\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 through\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 P4.<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-208\" src=\"http:\/\/csp11.epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-43.jpg\" alt=\"\" width=\"439\" height=\"543\" srcset=\"https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-43.jpg 439w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-43-243x300.jpg 243w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-43-65x80.jpg 65w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-43-225x278.jpg 225w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-43-350x433.jpg 350w\" sizes=\"auto, (max-width: 439px) 100vw, 439px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><strong>Summary<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p>Outlined the Simplified DES algorithm and discussed the encryption process in S- DES.<\/p>\n<table>\n<tbody>\n<tr>\n<td><strong>you can view video on Simplified DES<\/strong><\/td>\n<td><a href=\"https:\/\/youtu.be\/Bkns-lZc944\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-120\" src=\"http:\/\/epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/2018\/11\/download.png\" alt=\"\" width=\"36\" height=\"36\" \/><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-209 aligncenter\" src=\"http:\/\/csp11.epgpbooks.inflibnet.ac.in\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-44.jpg\" alt=\"\" width=\"531\" height=\"360\" srcset=\"https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-44.jpg 531w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-44-300x203.jpg 300w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-44-65x44.jpg 65w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-44-225x153.jpg 225w, https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-content\/uploads\/sites\/55\/2018\/07\/Capture-44-350x237.jpg 350w\" sizes=\"auto, (max-width: 531px) 100vw, 531px\" \/><\/p>\n","protected":false},"author":3,"menu_order":15,"template":"","meta":{"_acf_changed":false,"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-195","chapter","type-chapter","status-publish","hentry"],"part":3,"_links":{"self":[{"href":"https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-json\/pressbooks\/v2\/chapters\/195","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-json\/wp\/v2\/users\/3"}],"version-history":[{"count":9,"href":"https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-json\/pressbooks\/v2\/chapters\/195\/revisions"}],"predecessor-version":[{"id":559,"href":"https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-json\/pressbooks\/v2\/chapters\/195\/revisions\/559"}],"part":[{"href":"https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-json\/pressbooks\/v2\/parts\/3"}],"metadata":[{"href":"https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-json\/pressbooks\/v2\/chapters\/195\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-json\/wp\/v2\/media?parent=195"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-json\/pressbooks\/v2\/chapter-type?post=195"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-json\/wp\/v2\/contributor?post=195"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/ebooks.inflibnet.ac.in\/csp11\/wp-json\/wp\/v2\/license?post=195"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}