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2. 3. 4. : (DES) (RSA) : - . - . - 5. 1. . 2. . 3. . 4. . 6. (Substitution Cipher) - 1:1 . Ex) ABCDEFGHIJKLMNO BCDEFGHIJKLMNOA 7. (Transposition Cipher) - . Ex) I LOVE YOU UOY EVOL I 8. 9. -> key , 10. http://ssspocket.dothome.co.kr/cipher/des.php 11. : , : --> : SEED, DES, 3DES,AES 12. . , ! 13. : : . :RSA 14. Design by