{"description":"Kazuho@Cybouzu Labs: Hash \\neq MAC Consider the \"prepend-only\" construction: MAC_k(x) = F(k, x) (i.e., the key k is prepended to the data x and the hash function - with the fixed IV - computed on the concatenated information). Because of the iterative structure of F it is easy to see that if one kno\u2026","width":"100%","provider_url":"https://hatena.blog","author_url":"https://blog.hatena.ne.jp/smoking186/","image_url":null,"author_name":"smoking186","version":"1.0","provider_name":"Hatena Blog","height":"190","blog_url":"https://186.hatenablog.com/","url":"https://186.hatenablog.com/entry/20060508/1147066615","blog_title":"186 @ hatenablog","type":"rich","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2F186.hatenablog.com%2Fentry%2F20060508%2F1147066615\" title=\"MAC_k(x)=MD5(k,x) \u3068\u3057\u305f\u3068\u304d\u306b\u4e0d\u5473\u3044\u7406\u7531. - 186 @ hatenablog\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","published":"2006-05-08 14:36:55","title":"MAC_k(x)=MD5(k,x) \u3068\u3057\u305f\u3068\u304d\u306b\u4e0d\u5473\u3044\u7406\u7531.","categories":[]}