{"id":23664,"date":"2018-12-11T16:36:09","date_gmt":"2018-12-11T21:36:09","guid":{"rendered":"https:\/\/mjtsai.com\/blog\/?p=23664"},"modified":"2018-12-11T16:36:09","modified_gmt":"2018-12-11T21:36:09","slug":"the-key-from-before-enabling-filevault","status":"publish","type":"post","link":"https:\/\/mjtsai.com\/blog\/2018\/12\/11\/the-key-from-before-enabling-filevault\/","title":{"rendered":"The Key From Before Enabling FileVault"},"content":{"rendered":"<p><a href=\"https:\/\/macperformanceguide.com\/blog\/2018\/20181211_1102-FileVault.html\">Lloyd Chambers<\/a>:<\/p>\n<blockquote cite=\"https:\/\/macperformanceguide.com\/blog\/2018\/20181211_1102-FileVault.html\">\n<p>The behavior I observe implies that turning on FileVault and supplying a password does nothing more than encrypt the encryption key <em>already there<\/em> using the user-supplied password (and presumably a random salt value or vice versa). Because if the data is already encrypted, the decryption key and\/or salt value either must remain the same, or all the data must be decrypted and re-encrypted.<\/p>\n<p>Which suggests some level of security risk since that key already existed without the password protection of the user-supplied encryption password. I presume that the T4 secure enclave somehow forestalls this security risk, but I do not know the details. Maybe there is some per-chip specificity that forestalls a general security weakness. Even so, that assumes hardware invulnerability, which is not possible.<\/p>\n<\/blockquote>\n<p>I have been wondering about that, too.<\/p>","protected":false},"excerpt":{"rendered":"<p>Lloyd Chambers: The behavior I observe implies that turning on FileVault and supplying a password does nothing more than encrypt the encryption key already there using the user-supplied password (and presumably a random salt value or vice versa). Because if the data is already encrypted, the decryption key and\/or salt value either must remain the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"apple_news_api_created_at":"2018-12-11T21:36:11Z","apple_news_api_id":"3bab848e-8ec1-44dc-9719-8e813ad4ea89","apple_news_api_modified_at":"2018-12-11T21:36:12Z","apple_news_api_revision":"AAAAAAAAAAD\/\/\/\/\/\/\/\/\/\/w==","apple_news_api_share_url":"https:\/\/apple.news\/AO6uEjo7BRNyXGY6BOtTqiQ","apple_news_coverimage":0,"apple_news_coverimage_caption":"","apple_news_is_hidden":false,"apple_news_is_paid":false,"apple_news_is_preview":false,"apple_news_is_sponsored":false,"apple_news_maturity_rating":"","apple_news_metadata":"\"\"","apple_news_pullquote":"","apple_news_pullquote_position":"","apple_news_slug":"","apple_news_sections":"\"\"","apple_news_suppress_video_url":false,"apple_news_use_image_component":false,"footnotes":""},"categories":[],"tags":[1607,706,30,1609,48],"class_list":["post-23664","post","type-post","status-publish","format-standard","hentry","tag-apple-t2","tag-filevault","tag-mac","tag-macos-10-14","tag-security"],"apple_news_notices":[],"_links":{"self":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts\/23664","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/comments?post=23664"}],"version-history":[{"count":1,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts\/23664\/revisions"}],"predecessor-version":[{"id":23665,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts\/23664\/revisions\/23665"}],"wp:attachment":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/media?parent=23664"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/categories?post=23664"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/tags?post=23664"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}