[vc_row height=”medium” us_bg_overlay_color=”#f5f5f5″ us_shape_show_bottom=”1″ us_shape_color_bottom=”#ffffff” css=”%7B%22default%22%3A%7B%22background-color%22%3A%22%23f5f5f5%22%7D%7D”][vc_column width=”5\/6″][vc_column_text css=”%7B%22default%22%3A%7B%22color%22%3A%22%23023047%22%7D%7D”]<\/p>\n
[\/vc_column_text][us_separator][\/vc_column][vc_column width=”1\/6″][\/vc_column][\/vc_row][vc_row height=”small” us_bg_overlay_color=”#ffffff”][vc_column][vc_column_text css=”%7B%22default%22%3A%7B%22color%22%3A%22%23023047%22%2C%22font-family%22%3A%22Source%20Code%20Pro%22%2C%22background-color%22%3A%22%23ffffff%22%7D%7D”]Given a key k, a block cipher E_k is a family of permutations that takes a fixed-sized block as input and returns an encrypted message of the same size.[\/vc_column_text][\/vc_column][\/vc_row][vc_row height=”small” color_scheme=”alternate” us_bg_overlay_color=”#ffffff” css=”%7B%22default%22%3A%7B%22background-color%22%3A%22%23ffffff%22%7D%7D”][vc_column width=”1\/12″][\/vc_column][vc_column us_bg_overlay_color=”#ffffff” link=”%7B%22url%22%3A%22%22%7D” width=”11\/12″][vc_column_text css=”%7B%22default%22%3A%7B%22color%22%3A%22%231a1a1a%22%7D%7D”]Block ciphers are\u00a0usually built by iterating a round function; a process that is repeated r times (sub-keys might optionally be derived from a key schedule algorithm applied to the master key), where r is chosen such that the cipher offers a good security margin and efficiency when evaluating the function.[\/vc_column_text][vc_row_inner][vc_column_inner width=”1\/2″][us_image image=”1345″ size=”medium” link=”%7B%22url%22%3A%22%22%7D”][\/vc_column_inner][vc_column_inner width=”1\/2″][us_image image=”1346″ size=”us_600_600″ link=”%7B%22url%22%3A%22%22%7D”][\/vc_column_inner][\/vc_row_inner][vc_row_inner][vc_column_inner][vc_column_text css=”%7B%22default%22%3A%7B%22color%22%3A%22%231a1a1a%22%7D%7D”]A block cipher is said to be secure if E_k, with a randomly chosen key, is indistinguishable from a random permutation. Thus, each round in the iterated construction must bring some confusion<\/strong> (such that changing the input has an unpredictable effect on the output) and diffusion<\/strong> (such that changing a few entries in the input changes many entries in the output).<\/p>\n The most common round function constructions are Feistel networks and Substitution Permutation Networks (SPNs).[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row height=”small” color_scheme=”alternate” us_bg_overlay_color=”#ffffff” css=”%7B%22default%22%3A%7B%22background-color%22%3A%22%23ffffff%22%7D%7D”][vc_column us_bg_overlay_color=”#ffffff” link=”%7B%22url%22%3A%22%22%7D”][vc_custom_heading text=”Constructions” font_container=”tag:h2|font_size:42|text_align:left|color:%23219ebc” google_fonts=”font_family:ABeeZee%3Aregular%2Citalic|font_style:400%20regular%3A400%3Anormal”][us_separator size=”small”][vc_row_inner][vc_column_inner width=”1\/2″][vc_column_text css=”%7B%22default%22%3A%7B%22color%22%3A%22%23023047%22%2C%22font-size%22%3A%2230px%22%7D%7D”]<\/p>\n Feistel networks<\/strong><\/p>\n [\/vc_column_text][vc_column_text css=”%7B%22default%22%3A%7B%22color%22%3A%22%231a1a1a%22%7D%7D”]In a Feistel network, the input x is divided into two parts: x_L and x_R, each of size n\/2 bits.[\/vc_column_text][us_image image=”1349″ align=”center” size=”medium” link=”%7B%22url%22%3A%22%22%7D”][us_separator size=”small”][us_image image=”1348″ align=”center” size=”medium” link=”%7B%22url%22%3A%22%22%7D”][us_separator size=”small”][vc_column_text css=”%7B%22default%22%3A%7B%22color%22%3A%22%231a1a1a%22%7D%7D”]A well-known Feistel cipher is the Data Encryption Standard (DES), which is no longer used because of its small key space, allowing a systematic attack in a reasonable amount of time.[\/vc_column_text][\/vc_column_inner][vc_column_inner width=”1\/2″][vc_column_text css=”%7B%22default%22%3A%7B%22color%22%3A%22%23023047%22%2C%22font-size%22%3A%2230px%22%7D%7D”]<\/p>\n SPNs<\/strong><\/p>\n [\/vc_column_text][vc_column_text css=”%7B%22default%22%3A%7B%22color%22%3A%22%231a1a1a%22%7D%7D”]An SPN comprises three components: an S-box layer S, a diffusion layer M, and a sub-key addition AddK.[\/vc_column_text][us_separator size=”small”][us_image image=”1350″ align=”center” size=”medium” link=”%7B%22url%22%3A%22%22%7D”][us_separator][vc_column_text css=”%7B%22default%22%3A%7B%22color%22%3A%22%231a1a1a%22%7D%7D”]The most widely used block cipher (and best-known symmetric encryption) is the Advanced Encryption Standard (AES), considered the most secure in the community.[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row height=”small” color_scheme=”alternate” us_bg_overlay_color=”#f5f5f5″ css=”%7B%22default%22%3A%7B%22background-color%22%3A%22_header_middle_bg%22%7D%7D”][vc_column link=”%7B%22url%22%3A%22%22%7D” css=”%7B%22default%22%3A%7B%22background-color%22%3A%22%23f5f5f5%22%7D%7D”][vc_row_inner content_placement=”middle” css=”%7B%22default%22%3A%7B%22background-color%22%3A%22%23f5f5f5%22%2C%22border-style%22%3A%22solid%22%2C%22border-color%22%3A%22%231a1a1a%22%7D%7D”][vc_column_inner width=”1\/12″][\/vc_column_inner][vc_column_inner us_bg_overlay_color=”#f5f5f5″ link=”%7B%22url%22%3A%22%22%7D” css=”%7B%22default%22%3A%7B%22background-color%22%3A%22%23f5f5f5%22%2C%22border-radius%22%3A%225px%22%2C%22border-style%22%3A%22double%22%2C%22border-left-width%22%3A%2255%22%2C%22border-top-width%22%3A%2244%22%2C%22border-bottom-width%22%3A%2255%22%2C%22border-right-width%22%3A%2255%22%2C%22border-color%22%3A%22%23023047%22%2C%22box-shadow-blur%22%3A%223px%22%2C%22box-shadow-color%22%3A%22%23023047%22%7D%7D” width=”10\/12″][vc_custom_heading text=”STAP Lounge” font_container=”tag:h2|font_size:42|text_align:center|color:%23219ebc” google_fonts=”font_family:ABeeZee%3Aregular%2Citalic|font_style:400%20regular%3A400%3Anormal”][vc_column_text css=”%7B%22default%22%3A%7B%22color%22%3A%22%23333333%22%7D%7D”]<\/p>\n The STAP Zoo currently collects information about the following list of STAP block ciphers:<\/p>\n \u25ca Arion<\/a><\/span> [\/vc_column_text][us_separator][us_image image=”1740″ meta=”1″ align=”center” link=”%7B%22url%22%3A%22%22%7D” css=”%7B%22default%22%3A%7B%22color%22%3A%22_header_middle_bg%22%7D%7D”][\/vc_column_inner][vc_column_inner width=”1\/12″][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row]<\/p>\n","protected":false},"excerpt":{"rendered":" [vc_row height=”medium” us_bg_overlay_color=”#f5f5f5″ us_shape_show_bottom=”1″ us_shape_color_bottom=”#ffffff” css=”%7B%22default%22%3A%7B%22background-color%22%3A%22%23f5f5f5%22%7D%7D”][vc_column width=”5\/6″][vc_column_text css=”%7B%22default%22%3A%7B%22color%22%3A%22%23023047%22%7D%7D”] STAP block ciphers [\/vc_column_text][us_separator][\/vc_column][vc_column width=”1\/6″][\/vc_column][\/vc_row][vc_row height=”small” us_bg_overlay_color=”#ffffff”][vc_column][vc_column_text css=”%7B%22default%22%3A%7B%22color%22%3A%22%23023047%22%2C%22font-family%22%3A%22Source%20Code%20Pro%22%2C%22background-color%22%3A%22%23ffffff%22%7D%7D”]Given a key k, a block cipher E_k is a family of permutations that takes a fixed-sized block as input and returns an encrypted message of the same size.[\/vc_column_text][\/vc_column][\/vc_row][vc_row height=”small” color_scheme=”alternate” us_bg_overlay_color=”#ffffff” css=”%7B%22default%22%3A%7B%22background-color%22%3A%22%23ffffff%22%7D%7D”][vc_column width=”1\/12″][\/vc_column][vc_column us_bg_overlay_color=”#ffffff” link=”%7B%22url%22%3A%22%22%7D” width=”11\/12″][vc_column_text css=”%7B%22default%22%3A%7B%22color%22%3A%22%231a1a1a%22%7D%7D”]Block ciphers are\u00a0usually […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":1,"comment_status":"open","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-1805","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/stap-wiki.fr\/index.php\/wp-json\/wp\/v2\/pages\/1805","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stap-wiki.fr\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/stap-wiki.fr\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/stap-wiki.fr\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/stap-wiki.fr\/index.php\/wp-json\/wp\/v2\/comments?post=1805"}],"version-history":[{"count":0,"href":"https:\/\/stap-wiki.fr\/index.php\/wp-json\/wp\/v2\/pages\/1805\/revisions"}],"wp:attachment":[{"href":"https:\/\/stap-wiki.fr\/index.php\/wp-json\/wp\/v2\/media?parent=1805"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n\u25ca Chaghri<\/a><\/span>
\n\u25ca GMiMC<\/a><\/span>
\n\u25ca Grendel<\/a><\/span>
\n\u25ca Griffin<\/a><\/span>
\n\u25ca LowMC<\/a><\/span>
\n\u25ca MARVELlous design<\/a> (Jarvis)<\/span>
\n\u25ca Marvellous designs<\/a> (Rescue and Vision)<\/span>
\n\u25ca MiMC<\/a><\/span>
\n\u25ca Poseidon variants<\/a> (HadesMiMC)<\/span>
\n\u25ca RAIN<\/a><\/span>
\n\u25ca Small-pSquare<\/a><\/span><\/p>\n