{"id":4898,"date":"2016-05-05T07:10:48","date_gmt":"2016-05-05T00:10:48","guid":{"rendered":"http:\/\/ttud.com.vn\/?p=4898"},"modified":"2017-10-02T14:39:42","modified_gmt":"2017-10-02T07:39:42","slug":"israel-phat-trien-cach-dung-nuoc-giai-khat-de-ma-hoa-giai-ma-cac-thong-diep-tuyet-mat","status":"publish","type":"post","link":"https:\/\/casta.ttud.com.vn\/index.php\/israel-phat-trien-cach-dung-nuoc-giai-khat-de-ma-hoa-giai-ma-cac-thong-diep-tuyet-mat\/","title":{"rendered":"Israel ph\u00e1t tri\u1ec3n c\u00e1ch d\u00f9ng n\u01b0\u1edbc gi\u1ea3i kh\u00e1t \u0111\u1ec3 m\u00e3 h\u00f3a, gi\u1ea3i m\u00e3 c\u00e1c th\u00f4ng \u0111i\u1ec7p tuy\u1ec7t m\u1eadt"},"content":{"rendered":"

S\u1eafp t\u1edbi n\u1ebfu b\u1ea1n th\u1ea5y trong phim 007 c\u00f3 c\u1ea3nh Bond \u0111\u1ecdc m\u1eadt th\u01b0 t\u1eeb m\u1ed9t ly bia ho\u1eb7c Coke th\u00ec c\u0169ng \u0111\u1eebng qu\u00e1 ng\u1ea1c nhi\u00ean b\u1edfi th\u1ef1c t\u1ebf c\u00e1c nh\u00e0 khoa h\u1ecdc Israel \u0111ang t\u00ecm c\u00e1ch s\u1eed d\u1ee5ng nhi\u1ec1u lo\u1ea1i h\u00f3a ch\u1ea5t th\u00f4ng d\u1ee5ng kh\u00e1c nhau \u0111\u1ec3 m\u00e3 h\u00f3a, gi\u1ea3i m\u00e3 nh\u1eefng th\u00f4ng \u0111i\u1ec7p \u1ea9n. Nghi\u00ean c\u1ee9u v\u1eeba \u0111\u01b0\u1ee3c c\u00f4ng b\u1ed1 m\u1edbi \u0111\u00e2y tr\u00ean t\u1ea1p ch\u00ed Nature.<\/strong><\/p>\n

\"\"<\/p>\n

T\u1eeb th\u1eddi th\u1ebf chi\u1ebfn th\u1ee9 nh\u1ea5t, c\u00e1c \u0111i\u1ec7p vi\u00ean \u0111\u00e3 c\u1ed1 t\u00ecm ra nhi\u1ec1u c\u00e1ch \u0111\u1ec3 \u1ea9n gi\u1ea5u c\u00e1c th\u00f4ng \u0111i\u1ec7p m\u1eadt trong nh\u1eefng th\u1ee9 t\u01b0\u1edfng ch\u1eebng nh\u01b0 v\u00f4 th\u01b0\u1edfng v\u00f4 ph\u1ea1t, bao g\u1ed3m b\u00fat vi\u1ebft s\u00e1p ho\u1eb7c c\u00e1i m\u00e0 nhi\u1ec1u ng\u01b0\u1eddi bi\u1ebft ch\u00ednh l\u00e0 vi\u1ebft ch\u1eef b\u1eb1ng n\u01b0\u1edbc c\u1ed1t chanh. C\u00e1ch l\u00e0m n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 steganography – \u1ea9n gi\u1ea5u nh\u1eefng th\u00f4ng \u0111i\u1ec7p m\u00e0 kh\u00f4ng d\u00f9ng d\u1eef li\u1ec7u ho\u1eb7c k\u00fd t\u1ef1.<\/p>\n

Nh\u01b0 tr\u01b0\u1eddng h\u1ee3p c\u1ee7a d\u00f9ng n\u01b0\u1edbc chanh nh\u01b0 m\u1ed9t lo\u1ea1i m\u1ef1c v\u00f4 h\u00ecnh l\u00e0 m\u1ed9t th\u00ed d\u1ee5 \u0111\u01a1n gi\u1ea3n c\u1ee7a vi\u1ec7c \u00e1p d\u1ee5ng h\u00f3a h\u1ecdc v\u00e0o steganography. Ng\u01b0\u1eddi ta s\u1ebd vi\u1ebft m\u1ed9t th\u00f4ng \u0111i\u1ec7p b\u1eb1ng n\u01b0\u1edbc c\u1ed1t chanh, sau \u0111\u00f3 \u0111\u1ee3i n\u00f3 kh\u00f4 v\u00e0 d\u00f2ng ch\u1eef s\u1ebd bi\u1ebfn m\u1ea5t. Tuy nhi\u00ean khi g\u1eb7p nhi\u1ec7t \u0111\u1ed9 cao th\u00ec acid trong n\u01b0\u1edbc chanh s\u1ebd ph\u1ea3n \u1ee9ng v\u1edbi \u0111\u01b0\u1eddng \u0111\u1ec3 Caramel h\u00f3a ch\u00fang, t\u1ea1o th\u00e0nh s\u1ea3n ph\u1ea9m m\u00e0u n\u00e2u v\u00e0 d\u00f2ng ch\u1eef l\u1ea1i hi\u1ec7n ra.<\/p>\n

D\u1ef1a tr\u00ean \u00fd t\u01b0\u1edfng n\u00e0y, c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u t\u1ea1i Vi\u1ec7n khoa h\u1ecdc Weizmann, Israel \u0111\u00e3 ti\u1ebfp t\u1ee5c ph\u00e1t tri\u1ec3n n\u00ean c\u00e1c bi\u1ec7n ph\u00e1p s\u1eed d\u1ee5ng h\u00f3a h\u1ecdc \u0111\u1ec3 \u1ea9n ch\u1ee9a c\u00e1c th\u00f4ng \u0111i\u1ec7p m\u1ed9t c\u00e1ch kh\u00e9o l\u00e9o v\u00e0 tinh t\u1ebf. \u0110\u00f3 l\u00e0 m\u1ed9t chu\u1ed7i c\u00e1c bi\u1ec7n ph\u00e1p ph\u1ee9c t\u1ea1p h\u00f3a h\u1ecdc ph\u1ee9c t\u1ea1p nh\u01b0ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng m\u1ed9t c\u00e1ch d\u1ec5 d\u00e0ng, k\u1ebft h\u1ee3p nhi\u1ec1u bi\u1ec7n ph\u00e1p steganography trong vi\u1ec7c m\u00e3 h\u00f3a, b\u1ea3o v\u1ec7 b\u1eb1ng m\u1eadt kh\u1ea9u v\u00e0 gi\u1ea3i m\u00e3.<\/p>\n

B\u1ea3n ch\u1ea5t c\u1ee7a c\u00e1ch l\u00e0m tr\u00ean ch\u1ee7 y\u1ebfu l\u00e0 d\u1ef1a v\u00e0o kh\u1ea3 n\u0103ng ph\u00e1t hu\u1ef3nh quang c\u1ee7a ph\u00e2n t\u1eed. Khi g\u1eb7p m\u1ed9t s\u1ed1 h\u00f3a ch\u1ea5t c\u1ee5 th\u1ec3, c\u00e1c ph\u00e2n t\u1eed n\u00e0y s\u1ebd ph\u00e1t ra \u00e1nh s\u00e1ng v\u1edbi nhi\u1ec1u b\u01b0\u1edbc s\u00f3ng kh\u00e1c nhau t\u00f9y thu\u1ed9c \u0111\u00f3 l\u00e0 h\u00f3a ch\u1ea5t g\u00ec, ph\u1ea3n \u1ee9ng ra sao. B\u1eb1ng c\u00e1ch \u0111o l\u01b0\u1eddng chi\u1ec1u d\u00e0i c\u00e1c b\u01b0\u1edbc s\u00f3ng n\u00e0y, ng\u01b0\u1eddi ta c\u00f3 th\u1ec3 thu \u0111\u01b0\u1ee3c nh\u1eefng \u0111o\u1ea1n m\u00e3 nh\u1eb1m gi\u1ea3i m\u00e3 c\u00e1c tin nh\u1eafn. Hi\u1ec7n t\u1ea1i th\u00ec c\u00e1c ph\u00e2n t\u1eed ch\u1ee9a m\u1eadt m\u00e3 \u0111\u00e3 \u0111\u01b0\u1ee3c c\u00e1c nh\u00e0 khoa h\u1ecdc t\u1ea1o ra trong ph\u00f2ng th\u00ed nghi\u1ec7m nh\u01b0ng s\u1eafp t\u1edbi, h\u1ecd c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng n\u00f3 trong nh\u1eefng s\u1ea3n ph\u1ea9m quen thu\u1ed9c nh\u01b0 Coke, c\u00e0 ph\u00ea h\u00f2a tan ho\u1eb7c n\u01b0\u1edbc s\u00fac mi\u1ec7ng.<\/p>\n

ma_hoa_phan_tu_Tinhte.jpg<\/p>\n

C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u01a1 b\u1ea3n c\u1ee7a c\u00e1ch m\u00e3 h\u00f3a tr\u00ean l\u00e0 g\u00e1n nh\u1eefng k\u00fd t\u1ef1 b\u1eb1ng nh\u1eefng bi\u1ec3u t\u01b0\u1ee3ng kh\u00e1c, th\u00ed d\u1ee5 nh\u01b0 d\u00f9ng s\u1ed1 \u0111\u1ec3 bi\u1ec3u th\u1ecb cho k\u00fd t\u1ef1. C\u1ee5 th\u1ec3 v\u1edbi th\u00f4ng \u0111i\u1ec7p “open sesame” (v\u1eebng \u01a1i m\u1edf ra), th\u00ec ch\u1eef “open” s\u1ebd \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a th\u00e0nh:<\/p>\n

O = 4350
\nP = 4650
\nE = 1350
\nN = 4050<\/p>\n

\u0110\u1ed3ng th\u1eddi c\u00e1c k\u00fd t\u1ef1 n\u00e0y s\u1ebd \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh nh\u1eefng b\u01b0\u1edbc s\u00f3ng \u00e1nh s\u00e1ng c\u1ee5 th\u1ec3 (\u0111o b\u1eb1ng \u0111\u01a1n v\u1ecb nm) v\u00e0 ch\u00fang ta s\u1ebd c\u00f3:<\/p>\n

O = 500nm
\nP = 520nm
\nE = 540nm
\nN = 560nm<\/p>\n

Ti\u1ebfp theo ng\u01b0\u1eddi ta s\u1ebd \u0111\u01b0a c\u00e1c ph\u00e2n t\u1eed v\u00e0o trong m\u1ed9t lo\u1ea1i h\u00f3a ch\u1ea5t c\u1ee5 th\u1ec3, th\u00ed d\u1ee5 nh\u01b0 n\u01b0\u1edbc Cola, v\u00e0 \u0111o l\u01b0\u1eddng l\u01b0\u1ee3ng \u00e1nh s\u00e1ng ph\u00e1t ra t\u1ea1i m\u1ed7i b\u01b0\u1edbc s\u00f3ng. V\u00e0 to\u00e0n b\u1ed9 qu\u00e1 tr\u00ecnh n\u00e0y theo c\u00e1c nh\u00e0 khoa h\u1ecdc l\u00e0 c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n b\u1eb1ng nh\u1eefng thi\u1ebft b\u1ecb c\u1ea7m tay \u0111\u01a1n gi\u1ea3n, gi\u00e1 r\u1ebb v\u00e0 th\u1eadm ch\u00ed l\u00e0 gi\u1ea5u v\u00e0o trong nh\u1eefng thi\u1ebft b\u1ecb kh\u00e1c, th\u00ed d\u1ee5 nh\u01b0 \u0111\u1ed3ng h\u1ed3 d\u00e0nh cho Bond.<\/p>\n

M\u1eb7t kh\u00e1c, hu\u1ef3nh quang \u0111\u01b0\u1ee3c \u0111o v\u1edbi nh\u1eefng \u0111\u01a1n v\u1ecb t\u00f9y ch\u1ecdn n\u00ean \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c c\u00f9ng m\u1ed9t con s\u1ed1 m\u00e3 h\u00f3a v\u00e0 gi\u1ea3i m\u00e3, ng\u01b0\u1eddi ta ph\u1ea3i th\u1ef1c hi\u1ec7n c\u00f9ng m\u1ed9t thi\u1ebft \u0111\u1eb7t v\u00e0 \u0111\u00e2y \u0111\u01b0\u1ee3c xem nh\u01b0 th\u00eam m\u1ed9t l\u1edbp b\u1ea3o m\u1eadt cho qu\u00e1 tr\u00ecnh n\u00e0y. Cu\u1ed1i c\u00f9ng, ng\u01b0\u1eddi ta s\u1ebd b\u1ed5 sung th\u00eam m\u1ed9t d\u00e3y s\u1ed1 \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 ho\u00e0n th\u00e0nh \u0111o\u1ea1n m\u00e3 kh\u00f3a. V\u00ec v\u1eady n\u1ebfu b\u1ea1n \u0111o 689 t\u1ea1i b\u01b0\u1edbc s\u00f3ng 500nm, sau \u0111\u00f3 th\u00eam v\u00e0o s\u1ed1 4350 th\u00ec gi\u00e1 tr\u1ecb cu\u1ed1i c\u00f9ng cho k\u00fd t\u1ef1 O s\u1ebd l\u00e0 5039.<\/p>\n

Qu\u00e1 tr\u00ecnh m\u00e3 h\u00f3a \u0111\u00e3 c\u00f3, b\u00e2y gi\u1edd ch\u1ec9 c\u1ea7n chuy\u1ec3n nh\u1eefng con s\u1ed1 v\u00e0 c\u00e1c ph\u00e2n t\u1eed hu\u1ef3nh quang cho b\u1ea5t c\u1ee9 ai m\u00e0 b\u1ea1n mu\u1ed1n g\u1edfi th\u00f4ng \u0111i\u1ec7p. C\u00e1c ph\u00e2n t\u1eed n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c gi\u1ea5u \u0111i b\u1eb1ng c\u00e1ch l\u00e0m kh\u00f4 v\u00e0 \u1ea9n trong m\u1ed9t b\u1ee9c th\u01b0 ch\u1eb3ng h\u1ea1n. Khi nh\u1eadn \u0111\u01b0\u1ee3c l\u00e1 th\u01b0, ng\u01b0\u1eddi nh\u1eadn ch\u1ec9 c\u1ea7n b\u1ecf b\u1ee9c th\u01b0 v\u00e0o trong m\u1ed9t nh\u00e3n hi\u1ec7u n\u01b0\u1edbc cola ch\u00ednh x\u00e1c, sau \u0111\u00f3 \u0111o \u00e1nh s\u00e1ng hu\u1ef3nh quang ph\u00e1t ra l\u00e0 c\u00f3 th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c th\u00f4ng \u0111i\u1ec7p. C\u00f2n n\u1ebfu kh\u00f4ng bi\u1ebft m\u00e0 d\u00f9ng n\u01b0\u1edbc s\u00fac mi\u1ec7ng \u0111\u1ec3 gi\u1ea3i m\u00e3 th\u00ec ng\u01b0\u1eddi \u0111\u00f3 s\u1ebd nh\u1eadn \u0111\u01b0\u1ee3c c\u00e1c gi\u00e1 tr\u1ecb sai, cu\u1ed1i c\u00f9ng l\u00e0 c\u00e1c ch\u1eef c\u00e1i thu \u0111\u01b0\u1ee3c s\u1ebd ho\u00e0n to\u00e0n v\u00f4 ngh\u0129a.<\/p>\n

H\u01a1n th\u1ebf n\u1eefa, c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u Israel cho bi\u1ebft c\u00f2n c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng bi\u1ec7n ph\u00e1p n\u00e0y \u0111\u1ec3 t\u1ea1o n\u00ean nh\u1eefng th\u00f4ng \u0111i\u1ec7p gi\u1ea3. Ngh\u0129a l\u00e0 n\u1ebfu kh\u00f4ng d\u00f9ng \u0111\u00fang lo\u1ea1i cola m\u00e0 s\u1eed d\u1ee5ng n\u01b0\u1edbc s\u00fac mi\u1ec7ng \u0111\u1ec3 gi\u1ea3i m\u00e3 (theo th\u00ed d\u1ee5 tr\u00ean) th\u00ec ng\u01b0\u1eddi \u0111\u00f3 s\u1ebd nh\u1eadn \u0111\u01b0\u1ee3c m\u1ed9t th\u00f4ng \u0111i\u1ec7p c\u00f3 ngh\u0129a nh\u01b0ng sai. Hi\u1ec7n t\u1ea1i to\u00e0n b\u1ed9 qu\u00e1 tr\u00ecnh n\u00e0y \u0111\u00e3 \u0111\u01b0\u1ee3c th\u1eed nghi\u1ec7m th\u00e0nh c\u00f4ng trong ph\u00f2ng th\u00ed nghi\u1ec7m, nghe c\u00f3 v\u1ebb ph\u1ee9c t\u1ea1p nh\u01b0ng c\u00e1c t\u00ecnh nguy\u1ec7n vi\u00ean tham gia d\u00f9ng th\u1eed \u0111\u1ec1u cho bi\u1ebft kh\u00e1 d\u1ec5 s\u1eed d\u1ee5ng. Do \u0111\u00f3, s\u1eafp t\u1edbi n\u1ebfu th\u1ea5y ai \u0111\u00f3 \u0111\u1ed5 c\u00e0 ph\u00ea ho\u1eb7c n\u01b0\u1edbc s\u00fap l\u00ean nh\u1eefng t\u1edd gi\u1ea5y th\u00ec \u0111\u1eebng v\u1ed9i c\u01b0\u1eddi nh\u00e9, h\u1ecd l\u00e0 \u0111i\u1ec7p vi\u00ean \u0111\u1ea5y!<\/p>\n

Tham kh\u1ea3o Theconversation\u200b<\/em><\/p>\n

Ngu\u1ed3n tinhte.v<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

S\u1eafp t\u1edbi n\u1ebfu b\u1ea1n th\u1ea5y trong phim 007 c\u00f3 c\u1ea3nh Bond \u0111\u1ecdc m\u1eadt th\u01b0 t\u1eeb m\u1ed9t ly bia ho\u1eb7c Coke th\u00ec c\u0169ng \u0111\u1eebng qu\u00e1 ng\u1ea1c nhi\u00ean b\u1edfi th\u1ef1c t\u1ebf c\u00e1c nh\u00e0 khoa h\u1ecdc Israel \u0111ang t\u00ecm c\u00e1ch s\u1eed d\u1ee5ng nhi\u1ec1u lo\u1ea1i h\u00f3a ch\u1ea5t th\u00f4ng d\u1ee5ng kh\u00e1c nhau \u0111\u1ec3 m\u00e3 h\u00f3a, gi\u1ea3i m\u00e3 nh\u1eefng th\u00f4ng \u0111i\u1ec7p […]<\/p>\n","protected":false},"author":17,"featured_media":5460,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[47],"tags":[],"class_list":["post-4898","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tin-tuc"],"_links":{"self":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/4898","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/users\/17"}],"replies":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/comments?post=4898"}],"version-history":[{"count":2,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/4898\/revisions"}],"predecessor-version":[{"id":5461,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/4898\/revisions\/5461"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/media\/5460"}],"wp:attachment":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/media?parent=4898"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/categories?post=4898"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/tags?post=4898"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}