{"id":765,"date":"2021-01-17T05:39:21","date_gmt":"2021-01-16T18:05:45","guid":{"rendered":"https:\/\/exampracticetests.com\/ISC\/SSCP\/systems-security-certified-practitioner-sscp-question0757\/"},"modified":"2021-01-17T05:44:39","modified_gmt":"2021-01-17T05:44:39","slug":"systems-security-certified-practitioner-sscp-question0757","status":"publish","type":"post","link":"https:\/\/exampracticetests.com\/ISC\/SSCP\/systems-security-certified-practitioner-sscp-question0757\/","title":{"rendered":"Systems Security Certified Practitioner &#8211; SSCP &#8211; Question0757"},"content":{"rendered":"<div class=\"question\">What is the maximum key size for the RC5 algorithm? <br \/><strong><br \/>A.<\/strong> 128 bits<br \/><strong>B.<\/strong> 256 bits<br \/><strong>C.<\/strong> 1024 bits<br \/><strong>D.<\/strong> 2040 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>D<\/strong><\/div>\n<p><strong>Explanation:<\/strong> <\/p>\n<div class=\"explanation\">\nRC5 is a fast block cipher created by Ron Rivest and analyzed by RSA Data Security, Inc.<br \/>\nIt is a parameterized algorithm with a variable block size, a variable key size, and a variable number of rounds.<br \/>\nAllowable choices for the block size are 32 bits (for experimentation and evaluation purposes only), 64 bits (for use a drop-in replacement for DES), and 128 bits.<br \/>\nThe number of rounds can range from 0 to 255, while the key can range from 0 bits to 2040 bits in size. Please note that some sources such as the latest Shon Harris book mentions that RC5 maximum key size is of 2048, not 2040 bits. I would definitively use RSA as the authoritative source which specifies a key of 2040 bits. It is an error in Shon&#8217;s book.<br \/>\nThe OIG book says: RC5 was developed by Ron Rivest of RSA and is deployed in many of RSA\u2019s products. It is a very adaptable product useful for many applications, ranging from software to hardware implementations. The key for RC5 can vary from 0 to 2040 bits, the number of rounds it executes can be adjusted from 0 to 255, and the length of the input words can also be chosen from 16-, 32-, and 64-bit lengths.<br \/>\nThe following answers were incorrect choices:<br \/>\nAll of the other answers were wrong.<br \/>\nReference(s) used for this question: Schneiter, Andrew (2013-04-15). Official (ISC)2 Guide to the CISSP CBK, Third Edition : Cryptography (Kindle Locations 10981101). . Kindle Edition.<br \/>\nHarris, Shon (2012-10-25). CISSP All-in-One Exam Guide, 6th Edition (Kindle Locations 16744-16747). McGraw-Hill. Kindle Edition. <a href=\"http:\/\/www.rsa.com\/rsalabs\/node.asp?id=2251,\" title=\"External link\" rel=\"nofollow noopener\" target=\"_blank\">http:\/\/www.rsa.com\/rsalabs\/node.asp?id=2251,<\/a> What are RC5 and RC6, RSA The Security Division of EMC. From Rivest himself, see <a href=\"http:\/\/people.csail.mit.edu\/rivest\/Rivest-rc5rev.pdf\" title=\"External link\" rel=\"nofollow noopener\" target=\"_blank\">http:\/\/people.csail.mit.edu\/rivest\/Rivest-rc5rev.pdf<\/a> Also see the draft IETF IPSEC standard which clearly mention that it is in fact 2040 bits as a MAXIMUM key size: <a href=\"http:\/\/www.tools.ietf.org\/html\/draft-ietf-ipsec-esp-rc5-cbc-00\" title=\"External link\" rel=\"nofollow noopener\" target=\"_blank\">http:\/\/www.tools.ietf.org\/html\/draft-ietf-ipsec-esp-rc5-cbc-00<\/a> <a href=\"http:\/\/en.wikipedia.org\/wiki\/RC5,\" title=\"External link\" rel=\"nofollow noopener\" target=\"_blank\">http:\/\/en.wikipedia.org\/wiki\/RC5,<\/a> Mention a maximum key size of 2040 as well.<\/div>\n<p><\/strong><\/span> <\/div>\n","protected":false},"excerpt":{"rendered":"<p>What is the maximum key size for the RC5 algorithm? A. 128 bitsB. 256 bitsC. 1024 bitsD. 2040 bits Show Answer Hide Answer Correct Answer: D Explanation: RC5 is a fast block cipher created by Ron Rivest and analyzed by RSA Data Security, Inc. It is a parameterized algorithm with a variable block size, a [&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":[1078,760,3],"class_list":["post-765","post","type-post","status-publish","format-standard","hentry","category-systems-security-certified-practitioner-sscp","tag-choices","tag-question-0757","tag-systems-security-certified-practitioner-sscp"],"_links":{"self":[{"href":"https:\/\/exampracticetests.com\/ISC\/SSCP\/wp-json\/wp\/v2\/posts\/765","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=765"}],"version-history":[{"count":1,"href":"https:\/\/exampracticetests.com\/ISC\/SSCP\/wp-json\/wp\/v2\/posts\/765\/revisions"}],"predecessor-version":[{"id":1841,"href":"https:\/\/exampracticetests.com\/ISC\/SSCP\/wp-json\/wp\/v2\/posts\/765\/revisions\/1841"}],"wp:attachment":[{"href":"https:\/\/exampracticetests.com\/ISC\/SSCP\/wp-json\/wp\/v2\/media?parent=765"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exampracticetests.com\/ISC\/SSCP\/wp-json\/wp\/v2\/categories?post=765"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exampracticetests.com\/ISC\/SSCP\/wp-json\/wp\/v2\/tags?post=765"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}