{"id":154,"date":"2010-04-17T23:38:09","date_gmt":"2010-04-18T08:38:09","guid":{"rendered":"\/blog\/?p=154"},"modified":"2023-09-21T09:39:18","modified_gmt":"2023-09-21T00:39:18","slug":"%ea%b8%b0%ec%b4%88-%ec%95%94%ed%98%b8%ed%95%99","status":"publish","type":"post","link":"https:\/\/hasu0707.duckdns.org\/blog\/?p=154","title":{"rendered":"\uae30\ucd08 \uc554\ud638\ud559"},"content":{"rendered":"\n

1. \uac1c \uc694 <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\ud604\ub300 \uc554\ud638\ud559\uc740 \uac1c\uc778\uc758 \ud504\ub77c\uc774\ubc84\uc2dc\ub97c \ubcf4\ud638\ud558\uace0 \uad6d\uc81c\uc801\uc73c\ub85c \ubc94\uc8c4\ub97c \uc608\ubc29\ud558\uac70\ub098 \uad6d\uac00\uc801 \uc815\ubcf4\ub97c \ubcf4\ud638\ud574\uc8fc\ub294 \ub370 \uacb0\uc815\uc801\uc778 \uc5ed\ud560\uc744 \ud55c\ub2e4. \uc554\ud638\ud559\uc740 \uc6d0\ub798 \uad70\uc0ac\uc640 \uc678\uad50\uc801\uc778 \ubaa9\uc801\uc5d0\uc11c \uc8fc\ub85c \uc54c\ub824\uc838 \uc654\uc73c\ub098, \ucd5c\uadfc \ucef4\ud4e8\ud130 \ud1b5\uc2e0\ub9dd\uacfc \uad00\ub828\ub41c \ubc94\uc8c4\uac00 \ube48\ubc88\ud558\uac8c \ubc1c\uc0dd\ud568\uc5d0 \ub530\ub77c \ub354\uc6b1 \uc77c\ubc18\uc758 \uc8fc\ubaa9\uc744 \ubc1b\uac8c \ub418\uc5c8\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

2. \uc554\ud638\ud559(cryptography) <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

1) \uc6a9\uc5b4 \uc18c\uac1c <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\uc77c\ubc18\uc801\uc778 \uc815\ubcf4\ub97c \ud3c9\ubb38(plaintext) \uc774\ub77c\uace0 \ud558\uace0, \uc774 \ud3c9\ubb38\uc758 \ub0b4\uc6a9\uc744 \uc228\uae30\ub294 \ubc29\ubc95\uc744 \uc554\ud638\ud654(encryption) \ub77c\uace0 \ud55c\ub2e4. \uc554\ud638\ud654\ub41c \ud3c9\ubb38\uc744 \uc554\ud638\ubb38(ciphertext)\uc544 \ud558\uba70, \uc554\ud638\ubb38\uc744 \ub2e4\uc2dc \ud3c9\ubb38\uc73c\ub85c \ubc14\uafb8\ub294 \ubc29\ubc95\uc744 \ubcf5\ud638\ud654 \ub77c\uace0 \ud55c\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\ud3c9\ubb38\uc740 \ube44\ud2b8\uc758 \ubc30\uc5f4, \ud14d\uc2a4\ud2b8 \ud30c\uc77c, \uc804\uc790\uc74c\uc131, \uc804\uc790 \ud654\uc0c1\ub4f1\uc774 \ub420 \uc218 \uc788\uc73c\uba70, \ucef4\ud4e8\ud130\uc5d0 \uc788\uc5b4\uc11c \uc774\ub4e4\uc740 \ub2e8\uc21c\ud788 \uc774\uc9c4 \ub370\uc774\ud130 \uc774\ub2e4. \uc554\ud638\ubb38 \ub610\ud55c \uc774\uc9c4 \ub370\uc774\ud130\uc774\uba70 \uadf8 \ud06c\uae30\ub294 \ud3c9\ubb38\uc758 \ud06c\uae30\uc640 \uac19\uac70\ub098 \ub54c\ub54c\ub85c \ud06c\uae30\ub3c4 \ud558\ub2e4. \ud3c9\ubb38\uc744 P, \uc554\ud638\ubb38\uc744 C, \uc554\ud638\ud654 \ud568\uc218\ub97c E \ub77c\uace0 \ud558\uba74, \uc218\ud559\uc801 \ud45c\ud604\uc73c\ub85c \uc554\ud638\ud654 \uacfc\uc815\uc740 \ub2e4\uc74c\uacfc \uac19\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

E(P)=C <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\ubc18\ub300\uc758 \ubc29\ubc95\uc73c\ub85c \ubcf5\ud638\ud654 \ud568\uc218\ub97c D\ub77c\uace0 \ud558\uba74, \ubcf5\ud638\ud654 \uacfc\uc815\uc740 \ub2e4\uc74c\uacfc \uac19\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

D(C)=P <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\uc554\ud638\ud654\ud55c \ud3c9\ubb38\uc744 \ubcf5\ud638\ud654\ud558\uba74 \ub2e4\uc2dc \ud3c9\ubb38\uc774 \ub098\uc624\ubbc0\ub85c \ub2e4\uc74c\uc2dd\ub3c4 \ud56d\uc0c1 \uc131\ub9bd\ub41c\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

D(E(P))=P <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\uc554\ud638 \uc54c\uace0\ub9ac\uc998\uc740 \uc554\ud638\ud654\uc640 \ubcf5\ud638\ud654\uc5d0 \uc4f0\uc774\ub294 \uc218\ud559\uc801 \ud568\uc218\uc774\ub2e4. \ud604\ub300 \uc554\ud638 \uc54c\uace0\ub9ac\uc998\uc740 \ud0a4\ub97c \uc0ac\uc6a9\ud55c\ub2e4. \ud0a4\ub97c k\ub77c\uace0 \ud558\uba74 \uc704\uc758 \uc218\uc2dd\uc740 \ub2e4\uc74c\uacfc \uac19\uc774 \ub41c\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

- \uc554\ud638\ud654 \ud0a4\uc640 \ubcf5\ud638\ud654 \ud0a4\uac00 \uac19\uc744 \ub54c - <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

Ek(P)=C <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

Dk(C)=P <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

Dk(Ek(P))=P <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

- \uc554\ud638\ud654 \ud0a4\uc640 \ubcf5\ud638\ud654 \ud0a4\uac00 \ub2e4\ub97c \ub54c,(\uc554\ud638\ud654 \ud0a4 k1, \ubcf5\ud638\ud654 \ud0a4 k2) - <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

Ek1(P)=C <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

Dk2(C)=P <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

Dk2(Ek1(P))=P <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

2) \uacf5\uac1c\ud0a4 \uc54c\uace0\ub9ac\uc998\uacfc \ube44\ubc00 \ud0a4 \uc54c\uace0\ub9ac\uc998. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\uc554\ud638\uc54c\uace0\ub9ac\uc998\uc740 \ud0a4\ub97c \uae30\ubc18\uc73c\ub85c \ub450\uac00\uc9c0\ub85c \ub098\ub204\uc5b4 \uc9c0\ub294\ub370, \ud558\ub098\ub294 \ub300\uce6d \ud0a4(symmetric-key) \uc54c\uace0\ub9ac\uc998 \uc774\uace0, \ub2e4\ub978 \ud558\ub098\ub294 \uacf5\uac1c\ud0a4(public-key) \uc54c\uace0\ub9ac\uc998 \uc774\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\ub300\uce6d \ud0a4 \uc54c\uace0\ub9ac\uc998\uc740 \uc554\ud638\ud654 \ud0a4\uc640 \ubcf5\ud638\ud654 \ud0a4\uac00 \uac19\uc740 \uac83\uc744 \ub9d0\ud55c\ub2e4. \uc774 \ud0a4\ub294 \ub178\ucd9c\ub418\uba74 \uc548\ub418\uae30 \ub54c\ubb38\uc5d0 \ube44\ubc00 \ud0a4(secret-key) \uc54c\uace0\ub9ac\uc998 \uc774\ub77c\uace0\ub3c4 \ud55c\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\uacf5\uac1c\ud0a4 \uc54c\uace0\ub9ac\uc998\uc740 \uc554\ud638\ud654\uc640 \ubcf5\ud638\ud654\uc5d0 \uc11c\ub85c \ub2e4\ub978 \ud0a4\ub97c \uc0ac\uc6a9\ud558\ub294 \uc54c\uace0\ub9ac\uc998\uc774\ub2e4. \uc81c 3\uc790\ub294 \uc554\ud638\ud654 \ud0a4\ub97c \uc54c\uace0\uc788\ub354\ub77c\ub3c4 \uc554\ud638\ubb38\uc744 \ubcf5\ud638\ud654 \ud560 \uc218 \uc5c6\ub2e4. \ubcf5\ud638\ud654 \ud0a4\ub97c \uac00\uc9c4 \uc0ac\ub78c\ub9cc\uc774 \uc554\ud638\ubb38\uc744 \ubcf5\ud638\ud654 \ud560 \uc218 \uc788\ub2e4. \uc774\ub7ec\ud55c \ud2b9\uc9d5 \ub54c\ubb38\uc5d0 \uc554\ud638\ud654 \ud0a4\ub97c \uacf5\uac1c\ud558\uace0, \ubcf5\ud638\ud654 \ud0a4\ub294 \uc228\uae34\ub2e4. \uc554\ud638\ud654 \ud0a4\ub97c \uacf5\uac1c\ud0a4(public-key), \ubcf5\ud638\ud654 \ud0a4\ub97c \uac1c\uc778\ud0a4(private-key)\ub77c\uace0 \ud55c\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

3. \uc554\ud638\ud574\ub3c5(cryptanalysis) <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\uc554\ud638\ud574\ub3c5\uc740 \ud0a4\uac00 \uc5c6\ub294 \uc0c1\ud0dc\uc5d0\uc11c \uc554\ud638\ubb38\uc744 \ubcf5\ud638\ud654 \uc2dc\ud0a4\ub294 \ubc29\ubc95\uc774\ub2e4. \uc554\ud638\ud574\ub3c5\uc744 \uc704\ud55c \uc2dc\ub3c4\ub97c \uacf5\uaca9\ubc95(attack) \uc774\ub77c\uace0 \ud55c\ub2e4. \uac01 \uacf5\uaca9\uc758 \ubaa9\uc801\uc740 \uc0ac\uc6a9\ub418\ub294 \ud0a4\ub97c \ucc3e\uac70\ub098 \ud3c9\ubb38\uc744 \ucc3e\ub294 \uac83\uc774\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\uc774\ub7ec\ud55c \uacf5\uaca9\ubc29\ubc95\uc740 \uadf8 \uc870\uac74\uc5d0 \ub530\ub77c \uc5ec\ub7ec \uac00\uc9c0 \ub2e4\ub978 \uc218\uc900\uc758 \ucc28\uc774\uac00 \uc788\ub2e4. \ub2e4\uc74c \uacf5\uaca9\uc758 \ub124\uac00\uc9c0 \uc218\uc900\uc740 \uacf5\uaca9\uc758 \uac15\ub3c4\uac00 \ud070 \uc21c\uc11c\ub85c \uc5f4\uac70\ub418\uc5b4 \uc788\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

Ciphertext-only attack <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\u21d2 \uc801\uc774 \uc554\ud638\ubb38\uc744 \uc785\uc218\ud558\uace0 \uc788\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

Known plaintext attack <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\u21d2 \uc801\uc774 \ud3c9\ubb38 \uc640 \ub300\uc751\ud558\ub294 \uc554\ud638\ubb38 \ub97c \uc785\uc218\ud558\uace0 \uc788\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

Chosen Plaintext attack <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\u21d2 \uc801\uc774 \uc554\ud638\uae30\uae30\uc5d0 \uc77c\uc2dc\uc801 \uc811\uadfc\uc744 \ud560 \uc218 \uc788\ub2e4. \uadf8\ub7ec\ubbc0\ub85c \uc801\ub2f9\ud55c \ud3c9\ubb38 \ub97c \uc120\ud0dd\ud560 \uc218 \uc788\uace0 \ub300\uc751\ud558\ub294 \uc554\ud638\ubb38 \ub97c \ub9cc\ub4e4 \uc218 \uc788\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

Chosen cipher text attack <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\u21d2 \uc801\uc774 \ubcf5\ud638\uae30\uae30\uc5d0 \uc77c\uc2dc\uc801 \uc811\uadfc\uc744 \ud560 \uc218 \uc788\ub2e4. \uadf8\ub7ec\ubbc0\ub85c \uc801\ub2f9\ud55c \uc554\ud638\ubb38 \ub97c \uc120\ud0dd\ud560 \uc218 \uc788\uace0 \ub300\uc751\ud558\ub294 \ud3c9\ubb38 \ub97c \ub9cc\ub4e4 \uc218 \uc788\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n


<\/SPAN><\/P>\n

4. \uc554\ud638\ud559\uc758 \uc5ed\uc0ac <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

1) \uace0\uc804 \uc554\ud638\ud559(Classical Cryptography) <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\ucef4\ud4e8\ud130\uac00 \uc0dd\uae30\uae30\uc804 \uc554\ud638\uc54c\uace0\ub9ac\uc998\uc740 \ubb38\uc790\ub97c \uae30\ubc18\uc73c\ub85c \ud588\ub2e4. \uc774\ub7ec\ud55c \uc54c\uace0\ub9ac\uc998\ub4e4\uc740 \ubb38\uc790\uc758 \uce58\ud658(substitute) \ub610\ub294 \uc804\uc704(transposition) \uadf8\ub9ac\uace0 \uc774\ub4e4\uc744 \ud569\uc131\ud55c \ubc29\ubc95\ub4e4\uc774\uc5c8\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\ud604\ub300\uc758 \uc554\ud638 \ubc95\ub4e4\uc740 \ud6e8\uc52c \ubcf5\uc7a1\ud574\uc9c0\uae34 \ud588\uc9c0\ub9cc, \uae30\ubcf8 \uc0ac\uc0c1\uc740 \ub611\uac19\ub2e4. \ubc14\ub010 \uac83\uc740 \ubb38\uc790\ub300\uc2e0 \ube44\ud2b8\ub97c \uc0ac\uc6a9\ud55c\ub2e4\ub294 \uac83\uc774\ub2e4. \ud607\ub300 \uc554\ud638\uc54c\uace0\ub9ac\uc998\uc911 \ub9ce\uc740 \uac83\ub4e4\uc774 \uce58\ud658\uacfc \uc804\uc704\ub97c \ud569\uc131\ud574 \ub193\uc740 \ud615\ud0dc\ub4e4\uc774\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

(1) \uce58\ud658(substitution)\uc554\ud638\ubc29\uc2dd <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\ud3c9\ubb38\uc758 \uad6c\uc131\uc694\uc18c \uc21c\uc11c\ub294 \ubcc0\ud558\uc9c0 \uc54a\uace0 \uac01 \uc694\uc18c\uc790\uccb4\uac00 \ub2e4\ub978 \ud615\ud0dc\uc758 \uc694\uc18c\ub85c \ub300\uce58\ub418\ub294 \ubc29\ubc95\uc744 \ub9d0\ud55c\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\uc720\uba85\ud55c Casesar Cipher \ub294 \uac01\uac01\uc758 \ubb38\uc790\ub97c \uc138 \ubc88\uc9f8 \uc624\ub978\ucabd\ubb38\uc790(\uc989, A\ub294 D\ub85c, B\ub294 E\ub85c, \u2026 , X\ub294 A\ub85c, Y\ub294 B\ub85c, Z\ub294 C\ub85c)\ub85c \uce58\ud658\ud558\ub294 \uac04\ub2e8\ud55c \uce58\ud658\uc554\ud638\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

(2) \uc804\uc704(transposition)\uc554\ud638\ubc29\uc2dd <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\ud3c9\ubb38\uc758 \uad6c\uc131\uc694\uc18c \uc790\uccb4\ub97c \ubcc0\ud654\uc2dc\ud0a4\uc9c0 \uc54a\uace0 \uadf8 \uc694\uc18c\ub4e4\uc758 \uc704\uce58\ub9cc \ubc14\uafb8\uc5b4 \uc554\ud638\ubb38\uc744 \ub9cc\ub4dc\ub294 \uc704\uce58\uad50\ud658 \ubc29\ubc95\uc744 \ub9d0\ud55c\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\ub3c5\uc77c\uc758 ADFGVX cipher\ub294 1\ucc28 \uc138\uacc4\ub300\uc804\uc5d0 \uc0ac\uc6a9\ud55c \uc554\ud638 \uc54c\uace0\ub9ac\uc998\uc73c\ub85c \uc804\uc704 \uc554\ud638 \ubc29\uc2dd\uc774\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\uc608) <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\ud3c9 \ubb38: SECRET KEY <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\ubc30\uc5f4\uc0c1\ud0dc: 1 2 3 <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

S E C <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

R E T <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

K E Y <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\uc554\ud638\ud654\ud0a4: (3 1 2) <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\uc554 \ud638 \ubb38: CSETREYKE <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

2) \ud604\ub300\uc554\ud638\ud559 <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\ud604\ub300 \uc554\ud638 \uc54c\uace0\ub9ac\uc998\uc740 \ud06c\uac8c \uacf5\uac1c\ud0a4 \ubc29\uc2dd\uacfc \ube44\ubc00\ud0a4 \ubc29\uc2dd\uc73c\ub85c \ub098\ub204\uc5b4 \uc9c4\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\ube44\ubc00\ud0a4 \ubc29\uc2dd\uc740 \uc554\ud638\ubb38\uc744 \uc804\ub2ec\ud558\uae30 \uc804\uc5d0 \uba3c\uc800 \uc548\uc804\ud55c \ud1b5\ub85c\ub97c \uc0ac\uc6a9\ud558\uc5ec \ube44\ubc00\ud0a4\ub97c \uc804\ub2ec\ud574\uc57c \ud558\ub294 \uc57d\uc810\uc774 \uc788\ub2e4. \uadf8\ub7ec\ub098 \uacf5\uac1c\ud0a4 \ubc29\uc2dd\uc758 \uacbd\uc6b0 \ud0a4\uc758 \uc804\ub2ec\uc774 \ud544\uc694\uc5c6\uc774 \uc554\ud638\ubb38\uc744 \uc804\ub2ec\ud560 \uc218 \uc788\ub2e4. \uadf8\ub7ec\uba74 \uc790\uae30\ub9cc\uc758 \uac1c\uc778\ud0a4\ub97c \uc0ac\uc6a9\ud558\uc5ec \uc554\ud638\ubb38\uc744 \ud574\ub3c5\ud560 \uc218 \uc788\ub2e4. \uc774\ub7f0 \uacf5\uac1c\ud0a4\uacc4\uc758 \uc0dd\uac01\uc740 1976\ub144\uc5d0 \ucc98\uc74c \ubc1c\ud45c\ub41c \ud6c4 1977\ub144\uc5d0 \ucc98\uc74c\uc73c\ub85c RSA\uc554\ud638\uacc4\uac00 \uc2e4\ud604\ub418\uc5c8\ub2e4. \uc774\ud6c4\uc5d0 \uc5ec\ub7ec \uacf5\uac1c\ud0a4 \uc554\ud638\uacc4\uac00 \uc218\ud559\uc801 \uc548\uc804\uc131\uc744 \uae30\ubc18\uc73c\ub85c \ubc1c\ud45c\ub418\uc5c8\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\uc77c\ubc18\uc801\uc73c\ub85c \ub9ce\uc774 \uc0ac\uc6a9\ub418\ub294 \uc54c\uace0\ub9ac\uc998\uc740 \ub2e4\uc74c\uacfc \uac19\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

(1) DES(The Data Encryption Standard)\ub294 IBM\uc5d0\uc11c LUCIFER\ub97c \uc218\uc815\ud558\uc5ec \uac1c\ubc1c\ud55c \ube44\ubc00\ud0a4 \uc54c\uace0\ub9ac\uc998\uc774\ub2e4. DES\ub294 \uae38\uc774 64\uc778 \ube44\ud2b8\ubb38\uc790\uc5f4 \uc554\ud638\ubb38\uc744 \ub9cc\ub4e4\uae30 \uc704\ud558\uc5ec, \uae38\uc774 56\ube44\ud2b8\ubb38\uc790\uc5f4\uc778 \uc801\ub2f9\ud55c \ud0a4\ub97c \uc0ac\uc6a9\ud558\uc5ec \uae38\uc774 64\uc778 \ud3c9\ubb38\ube44\ud2b8\ubb38\uc790\uc5f4\uc744 \uc554\ud638\ud654\ud55c\ub2e4. DES\uc5d0\uc11c \uc218\ud589\ub418\ub294 \uc720\uc77c\ud55c \uc0b0\uc220\uc740 \ube44\ud2b8\ubb38\uc790\uc5f4\uc758 \ubc30\ud0c0\uc801 or\uc774\uae30 \ub54c\ubb38\uc5d0 \ud558\ub4dc\uc6e8\uc5b4\uc801\uc73c\ub85c \ub610\ub294 \uc18c\ud504\ud2b8\uc6e8\uc5b4\uc801\uc73c\ub85c \ub9e4\uc6b0 \ud6a8\uc728\uc801\uc73c\ub85c \uc2e4\ud589\ud560 \uc218 \uc788\ub2e4. \ud558\uc9c0\ub9cc \ud0a4\uacf5\uac04\uc758 \ud06c\uae30\uac00 256 \uc73c\ub85c \ub108\ubb34 \uc791\uc544 \uc804\uc218\uc870\uc0ac(exhaustive search)\ub85c \uacf5\uaca9\ud560 \uc218 \uc788\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

(2) RSA(Rivest, Shamir, Adleman)\ub294 1978\ub144 MIT\uc5d0\uc11c \uac1c\ubc1c\ub41c \uacf5\uac1c\ud0a4 \uc54c\uace0\ub9ac\uc998\uc774\ub2e4. \uc774 \uc54c\uace0\ub9ac\uc998\uc740 \ud070 \uc18c\uc218\uac00 \uc18c\uc778\uc218\ubd84\ud574\ud558\uae30 \uc5b4\ub835\ub2e4\ub294 \uc218\ud559\uc801 \uc0ac\uc2e4\uc5d0 \uae30\ubc18\uc744 \ub450\uace0 \uc788\ub2e4. \uc8fc\ub85c \uc554\ud638\ud654\uc640 \uc804\uc790\uc11c\uba85\uc5d0 \uc0ac\uc6a9\ub41c\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

(3)DSA(Digital Signature Algorithm)\ub294 \uacf5\uac1c\ud0a4 \uc54c\uace0\ub9ac\uc998\uc73c\ub85c \uc804\uc790\uc11c\uba85\uc5d0\ub9cc \uc0ac\uc6a9\ub41c\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

5. \uc804\uc790\uc11c\uba85(digital signatures) <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\uc804\uc790\uc11c\uba85\uc740 \uc804\uc790\uc801 \ud615\ud0dc\ub85c \uc800\uc7a5\ub41c \uba54\uc2dc\uc9c0\ub97c \uc11c\uba85\ud558\ub294 \ubc29\ubc95\uc774\ub2e4. \uc11c\uba85\ub41c \uba54\uc2dc\uc9c0\ub294 \uacf5\uac1c\ub41c \uc99d\uba85\uc54c\uace0\ub9ac\uc998\uc744 \uc0ac\uc6a9\ud558\uc5ec \ud655\uc778\ud560 \uc218 \uc788\uc73c\uba70 \ub530\ub77c\uc11c \uc5b4\ub5a0\ud55c \uc0ac\ub78c\ub3c4 \uc804\uc790\uc11c\uba85\uc744 \ud655\uc778\ud560 \uc218 \uc788\ub2e4. \uc548\uc804\ud55c \uc11c\uba85\uae30\ubc95\uc758 \uc0ac\uc6a9\uc740 \ub0a0\uc870\uac00\ub2a5\uc131\uc744 \uc608\ubc29\ud560 \uc218 \uc788\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\uc804\uc790\uc11c\uba85\uc740 \uc11c\uba85\uc54c\uace0\ub9ac\uc998(a signing algorithm)\uacfc \uc99d\uba85 \uc54c\uace0\ub9ac\uc998(a verification algorithm)\uc73c\ub85c \uad6c\uc131\ub41c\ub2e4. \uc1a1\uc2e0\uc790\ub294 \ube44\ubc00\uc758 \uc11c\uba85 \uc54c\uace0\ub9ac\uc998\uc744 \uc0ac\uc6a9\ud558\uc5ec \uba54\uc2dc\uc9c0 \ub97c \uc0ac\uc778\ud560 \uc218 \uc788\ub2e4. \uadf8 \uacb0\uacfc\ub85c \uc0dd\uae30\ub294 \uc11c\uba85 \ub294 \uacf5\uac1c\ub41c \uc99d\uba85\uc54c\uace0\ub9ac\uc998 \ub97c \uc0ac\uc6a9\ud558\uc5ec \uc99d\uba85\ud560 \uc218 \uc788\ub2e4. DSS(The Digital Signature Standard, DSS)\ub294 \uc5d8\uac00\ub9d0 \uc11c\uba85\uae30\ubc95\uc758 \ubcc0\ud615\uc73c\ub85c 1994\ub144\uc5d0 \ud45c\uc900\uc73c\ub85c \ucc44\ud0dd\ub418\uc5c8\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

6. \ud0a4 \ubd84\ubc30 \ud504\ub85c\ud1a0\ucf5c <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\ube44\ubc00 \ud0a4 \uc554\ud638\uc2dc\uc2a4\ud15c\uc5d0\uc11c\ub294 \uc0ac\uc6a9\uc790\uac00 X \uba85\uc77c \ub54c, X \uac1c\uc758 \ud0a4\ub97c \ubd84\ubc30\ud574 \ub193\uc544\uc57c \ud55c\ub2e4. \uc774\ub7ec\ud55c \ub9ce\uc740 \ud0a4\ub4e4\uc740 \uad00\ub9ac\ub294 \ud0a4\uc758 \ub178\ucd9c\uc744 \uc27d\uac8c \ud55c\ub2e4. \uc774\ub97c \uadf9\ubcf5\ud558\uae30 \uc704\ud574 \uacf5\uac1c\ud0a4 \uc554\ud638\uc2dc\uc2a4\ud15c\uc5d0\uc11c\ub294 \uac01 \uc0ac\uc6a9\uc790\uac00 \uc790\uc2e0\uc758 \uac1c\uc778 \ud0a4\ub97c \uac00\uc9c0\uba70, \ubcf4\ub0b4\ub824\ub294 \uba54\uc2dc\uc9c0\ub294 \uc218\uc2e0\uc790\uc758 \uacf5\uac1c\ud0a4\ub85c \uc554\ud638\ud654\ud558\uc5ec \ubcf4\ub0b4\uace0, \ubc1b\uc740 \uba54\uc2dc\uc9c0\ub294 \uc790\uc2e0\uc758 \uac1c\uc778\ud0a4\ub85c \ubcf5\ud638\ud654 \ud558\uba74 \ub41c\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\uadf8\ub7ec\ub098 \uacf5\uac1c\ud0a4 \uc54c\uace0\ub9ac\uc998\uc740 \uc77c\ubc18\uc801\uc73c\ub85c \ube44\ubc00 \ud0a4 \uc54c\uace0\ub9ac\uc998\uc5d0 \ube44\ud574 \ud6e8\uc52c \ub290\ub9ac\ub2e4. \ub530\ub77c\uc11c \uc2e4\uc81c \uc0ac\uc6a9\uc5d0 \uc788\uc5b4\uc11c\ub294 \uc1a1\uc2e0\uc790\ub294 \uc790\ub8cc\uc758 \uc554\ud638\ud654\ub294 \ube44\ubc00 \ud0a4 \uc554\ud638\uc54c\uace0\ub9ac\uc998\uc744 \uc0ac\uc6a9\ud558\uc5ec \ud558\uace0, \uc774 \ube44\ubc00\ud0a4\ub294 \ub2e4\uc2dc \uc218\uc2e0\uc790\uc758 \uacf5\uac1c\ud0a4\ub85c \uc554\ud638\ud654 \ud558\uc5ec \uc554\ud638\ubb38\uacfc, \uc554\ud638\ud654\ub41c \ube44\ubc00 \ud0a4\ub97c \ubcf4\ub0b8\ub2e4. \uadf8\ub7ec\uba74 \uc218\uc2e0\uc790\ub294 \uc790\uc2e0\uc758 \uac1c\uc778 \ud0a4\ub97c \uc0ac\uc6a9\ud558\uc5ec \ube44\ubc00 \ud0a4\ub97c \ubcf5\ud638\ud654 \ud558\uace0, \uc774 \ube44\ubc00 \ud0a4\ub97c \uc0ac\uc6a9\ud558\uc5ec \uc554\ud638\ubb38\uc744 \ubcf5\ud638\ud654 \ud55c\ub2e4. <\/SPAN><\/P>\n


<\/SPAN><\/P>\n

\uacf5\uac1c\ud0a4 \uc554\ud638 \uc2dc\uc2a4\ud15c\uc5d0\uc11c \uac01 \uc0ac\uc6a9\uc790\ub294 \ub2e4\ub978 \uc0ac\uc6a9\uc790\uc758 \uacf5\uac1c \ud0a4\ub4e4\uc744 \uad00\ub9ac\ud574\uc57c \ud558\ub294\ub370, \ub124\ud2b8\uc6cd\uc5d0 \ub4f1\ub85d\ub41c \ubaa8\ub4e0 \uc0ac\uc6a9\uc790\uc5d0 \ub300\ud55c \uad00\ub9ac\uac00 \uc774\ub8e8\uc5b4\uc838\uc57c \ud558\uae30 \ub54c\ubb38\uc5d0 \ud604\uc2e4\uc801\uc73c\ub85c \ud798\ub4e4\ub2e4. \uc774\ub97c \uc704\ud574 \ubaa8\ub4e0 \ud0a4\ub4e4\uc744 \uad00\ub9ac\ud574\uc8fc\ub294 \ud0a4 \ubd84\ubc30\uc13c\ud130(Key Distribution Center)\ub77c\ub294 \uc11c\ubc84\uac00 \ud544\uc694\ud558\ub2e4. \ud0a4 \ubd84\ubc30\uc13c\ud130\ub294 \ubaa8\ub4e0 \uc0ac\uc6a9\uc790\ub4e4\uc758 \ud0a4\ub97c \uad00\ub9ac\ud55c\ub2e4. \ud1b5\uc2e0\ud558\ub824\ub294 \uc0ac\uc6a9\uc790\ub4e4\uc774 \ud0a4\ub97c \uc694\uccad\ud558\uba74 \ud0a4 \ubd84\ubc30 \uc13c\ud130\ub294 \ud0a4\ub97c \uc554\ud638\ud654 \ud558\uc5ec \uc694\uccad\ud55c \uc0ac\uc6a9\uc790\ub4e4\uc5d0\uac8c \ub098\ub204\uc5b4 \uc8fc\uac8c \ub41c\ub2e4. \ud0a4 \ubd84\ubc30\uc13c\ud130\ub294 \uc804\uccb4 \ubcf4\uc548\uccb4\uc81c\uc5d0 \ud070 \uc601\ud5a5\uc744 \ubbf8\uce58\uae30 \ub54c\ubb38\uc5d0 \uc548\uc804\uc131\uc744 \ubcf4\uc7a5 \ubc1b\uc544\uc57c \ud55c\ub2e4.<\/SPAN><\/P>\n","protected":false},"excerpt":{"rendered":"

1. \uac1c \uc694 \ud604\ub300 \uc554\ud638\ud559\uc740 \uac1c\uc778\uc758 \ud504\ub77c\uc774\ubc84\uc2dc\ub97c \ubcf4\ud638\ud558\uace0 \uad6d\uc81c\uc801\uc73c\ub85c \ubc94\uc8c4\ub97c \uc608\ubc29\ud558\uac70\ub098 \uad6d\uac00\uc801 \uc815\ubcf4\ub97c \ubcf4\ud638\ud574\uc8fc\ub294 \ub370 \uacb0\uc815\uc801\uc778 \uc5ed\ud560\uc744 \ud55c\ub2e4. \uc554\ud638\ud559\uc740 \uc6d0\ub798 \uad70\uc0ac\uc640 \uc678\uad50\uc801\uc778 \ubaa9\uc801\uc5d0\uc11c \uc8fc\ub85c \uc54c\ub824\uc838 \uc654\uc73c\ub098, \ucd5c\uadfc \ucef4\ud4e8\ud130 \ud1b5\uc2e0\ub9dd\uacfc \uad00\ub828\ub41c \ubc94\uc8c4\uac00 \ube48\ubc88\ud558\uac8c \ubc1c\uc0dd\ud568\uc5d0 \ub530\ub77c \ub354\uc6b1 \uc77c\ubc18\uc758 \uc8fc\ubaa9\uc744 \ubc1b\uac8c \ub418\uc5c8\ub2e4. 2. \uc554\ud638\ud559(cryptography) 1) \uc6a9\uc5b4 \uc18c\uac1c \uc77c\ubc18\uc801\uc778 \uc815\ubcf4\ub97c \ud3c9\ubb38(plaintext) \uc774\ub77c\uace0 \ud558\uace0, \uc774 \ud3c9\ubb38\uc758 \ub0b4\uc6a9\uc744 \uc228\uae30\ub294 \ubc29\ubc95\uc744 \uc554\ud638\ud654(encryption) […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[12],"tags":[],"class_list":["post-154","post","type-post","status-publish","format-standard","hentry","category-computing_security"],"_links":{"self":[{"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/154","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=154"}],"version-history":[{"count":0,"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/154\/revisions"}],"wp:attachment":[{"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=154"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=154"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hasu0707.duckdns.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=154"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}