{"id":743,"date":"2021-01-17T05:38:57","date_gmt":"2021-01-16T18:05:20","guid":{"rendered":"https:\/\/exampracticetests.com\/ISC\/SSCP\/systems-security-certified-practitioner-sscp-question0735\/"},"modified":"2021-01-17T05:44:37","modified_gmt":"2021-01-17T05:44:37","slug":"systems-security-certified-practitioner-sscp-question0735","status":"publish","type":"post","link":"https:\/\/exampracticetests.com\/ISC\/SSCP\/systems-security-certified-practitioner-sscp-question0735\/","title":{"rendered":"Systems Security Certified Practitioner &#8211; SSCP &#8211; Question0735"},"content":{"rendered":"<div class=\"question\">What is the maximum allowable key size of the Rijndael encryption algorithm? <br \/><strong><br \/>A.<\/strong> 128 bits<br \/><strong>B.<\/strong> 192 bits<br \/><strong>C.<\/strong> 256 bits<br \/><strong>D.<\/strong> 512 bits<\/div>\n<p><\/p>\n<style> .hidden-div{ display:none } <\/style>\n<p>\t\t\t\t\t\t\t<button onclick=\"getElementById('hidden-div').style.display = 'block'\"> Show Answer <\/button> <button onclick=\"getElementById('hidden-div').style.display = 'none'\">Hide Answer<\/button><\/p>\n<div class=\"hidden-div\" id=\"hidden-div\"><span style=\"\"><\/p>\n<div class=\"answer\">Correct Answer: <strong>C<\/strong><\/div>\n<p><strong>Explanation:<\/strong> <\/p>\n<div class=\"explanation\">\nThe Rijndael algorithm, chosen as the Advanced Encryption Standard (AES) to replace DES, can be categorized as an iterated block cipher with a variable block length and key length that can be independently chosen as 128, 192 or 256 bits. Below you have a summary of the differences between AES and Rijndael. AES is the advanced encryption standard defined by FIPS 197. It is implemented differently than Rijndael:<br \/>\nFIPS-197 specifies that the block size must always be 128 bits in AES, and that the key size may be either 128, 192, or 256 bits. Therefore AES-128, AES-192, and AES-256 are actually: Key Size (bits) Number of rounds Block Size (bits) AES-128<br \/>\n128 10 Rounds<br \/>\n128 AES-192<br \/>\n192 12 Rounds<br \/>\n128 AES-256<br \/>\n256 14 Rounds<br \/>\n128<br \/>\nSome book will say &#8220;up to 9 rounds will be done with a 128 bits keys&#8221;. Really it is 10 rounds because you must include round zero which is the first round.<br \/>\nBy contrast, the Rijndael specification per se is specified with block and key sizes that may be any multiple of 32 bits, both with a minimum of 128 and a maximum of 256 bits.<br \/>\nReference(s) used for this question:<br \/>\nKRUTZ, Ronald L. &#038; VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley &#038; Sons, 2001, Chapter 4: Cryptography (page 153).<br \/>\nand FIPS 197 and <a href=\"https:\/\/en.wikipedia.org\/wiki\/Advanced_Encryption_Standard\" title=\"External link\" rel=\"nofollow noopener\" target=\"_blank\">https:\/\/en.wikipedia.org\/wiki\/Advanced_Encryption_Standard<\/a><\/div>\n<p><\/strong><\/span> <\/div>\n","protected":false},"excerpt":{"rendered":"<p>What is the maximum allowable key size of the Rijndael encryption algorithm? A. 128 bitsB. 192 bitsC. 256 bitsD. 512 bits Show Answer Hide Answer Correct Answer: C Explanation: The Rijndael algorithm, chosen as the Advanced Encryption Standard (AES) to replace DES, can be categorized as an iterated block cipher with a variable block length [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[1078,738,3],"class_list":["post-743","post","type-post","status-publish","format-standard","hentry","category-systems-security-certified-practitioner-sscp","tag-choices","tag-question-0735","tag-systems-security-certified-practitioner-sscp"],"_links":{"self":[{"href":"https:\/\/exampracticetests.com\/ISC\/SSCP\/wp-json\/wp\/v2\/posts\/743","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/exampracticetests.com\/ISC\/SSCP\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/exampracticetests.com\/ISC\/SSCP\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/exampracticetests.com\/ISC\/SSCP\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/exampracticetests.com\/ISC\/SSCP\/wp-json\/wp\/v2\/comments?post=743"}],"version-history":[{"count":1,"href":"https:\/\/exampracticetests.com\/ISC\/SSCP\/wp-json\/wp\/v2\/posts\/743\/revisions"}],"predecessor-version":[{"id":1819,"href":"https:\/\/exampracticetests.com\/ISC\/SSCP\/wp-json\/wp\/v2\/posts\/743\/revisions\/1819"}],"wp:attachment":[{"href":"https:\/\/exampracticetests.com\/ISC\/SSCP\/wp-json\/wp\/v2\/media?parent=743"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exampracticetests.com\/ISC\/SSCP\/wp-json\/wp\/v2\/categories?post=743"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exampracticetests.com\/ISC\/SSCP\/wp-json\/wp\/v2\/tags?post=743"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}