{"id":14088,"date":"2022-10-06T12:02:39","date_gmt":"2022-10-06T06:32:39","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-ceaser-cipher-crack-using-c-language\/"},"modified":"2022-10-06T12:02:39","modified_gmt":"2022-10-06T06:32:39","slug":"solved-ceaser-cipher-crack-using-c-language","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-ceaser-cipher-crack-using-c-language\/","title":{"rendered":"[Solved] Ceaser Cipher crack using C language"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-40536491\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"40536491\" data-parentid=\"40536345\" data-score=\"0\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>Recall that a Caesar Cipher has only 25 possible shifts. Also, for text of non-trivial length, it&#8217;s <em>highly<\/em> likely that <strong>only<\/strong> one shift will make the input make sense. One possible approach, then, is to see if the result of the shift makes sense; if it does, then it&#8217;s probably the correct shift (e.g. compare words against a dictionary to see if they&#8217;re &#8220;real&#8221; words; not sure if you&#8217;ve done web services yet, but there are <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/www.quora.com\/Is-there-a-free-to-use-dictionary-API\">free dictionary APIs<\/a> available).<\/p>\n<p>Consider the following text: <code>3 uryyb jbeyq<\/code>. Some possible shifts of this:<\/p>\n<ul>\n<li>3 gdkkn vnqkc (12)<\/li>\n<li>3 xubbe mehbt (3)<\/li>\n<li>3 hello world (13)<\/li>\n<li>3 jgnnq yqtnf (15)<\/li>\n<li>Etc.<\/li>\n<\/ul>\n<p>As you can see, only the shift of 13 makes this text contain &#8220;real&#8221; words, so the correct shift is probably 13.<\/p>\n<p>Another possible solution (albeit more complicated) is through <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/en.wikipedia.org\/wiki\/Frequency_analysis\">frequency analysis<\/a> (i.e. see if the resulting text has the same &#8211; or similar &#8211; statistical characteristics as English). For example, in English the most frequent letter is &#8220;e,&#8221; so the correct shift will likely have &#8220;e&#8221; as the most frequent letter. By way of example, the first paragraph of this answer contains 48 instances of the letter &#8220;e&#8221;, but if you shift it by 15 letters, it only has 8:<\/p>\n<blockquote>\n<p>Gtrpaa iwpi p Rpthpg Rxewtg wph dcan 25 edhhxqat hwxuih. Pahd, udg<br \/>\n  itmi du cdc-igxkxpa atcviw, xi&#8217;h wxvwan axztan iwpi dcan dct hwxui<br \/>\n  lxaa bpzt iwt xceji bpzt htcht. Dct edhhxqat peegdprw, iwtc, xh id htt<br \/>\n  xu iwt gthjai du iwt hwxui bpzth htcht; xu xi sdth, iwtc xi&#8217;h egdqpqan<br \/>\n  iwt rdggtri hwxui (t.v. rdbepgt ldgsh pvpxchi p sxrixdcpgn id htt xu<br \/>\n  iwtn&#8217;gt &#8220;gtpa&#8221; ldgsh; cdi hjgt xu ndj&#8217;kt sdct ltq htgkxrth nti, qji<br \/>\n  iwtgt pgt ugtt sxrixdcpgn PEXh pkpxapqat).<\/p>\n<\/blockquote>\n<p>The key word here is &#8220;likely&#8221; &#8211; it&#8217;s not at all statistically certain (especially for shorter texts) and it&#8217;s possible to write text that&#8217;s resistant to that technique to some degree (e.g. through deliberate misspellings, <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/en.wikipedia.org\/wiki\/Lipogram\">lipograms<\/a>, etc.). Note that I actually have an example of an exception above &#8211; &#8220;3 xubbe mehbt&#8221; has more instances of the letter &#8220;e&#8221; than &#8220;3 hello world&#8221; even though the second one is clearly the correct shift &#8211; so you probably want to apply several statistical tests to increase your confidence (especially for shorter texts).<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">0<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Ceaser Cipher crack using C language <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Recall that a Caesar Cipher has only 25 possible shifts. Also, for text of non-trivial length, it&#8217;s highly likely that only one shift will make the input make sense. One possible approach, then, is to see if the result of the shift makes sense; if it does, then it&#8217;s probably the correct shift (e.g. &#8230; <a title=\"[Solved] Ceaser Cipher crack using C language\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-ceaser-cipher-crack-using-c-language\/\" aria-label=\"More on [Solved] Ceaser Cipher crack using C language\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[2310,324,557],"class_list":["post-14088","post","type-post","status-publish","format-standard","hentry","category-solved","tag-brute-force","tag-c","tag-encryption"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Ceaser Cipher crack using C language - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-ceaser-cipher-crack-using-c-language\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Ceaser Cipher crack using C language - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Recall that a Caesar Cipher has only 25 possible shifts. 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