n Cryptology n n kryptos logos Vigenre Cipher

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簡介 n 密碼學 Cryptology n n 隱藏(kryptos) 訊息(logos)

簡介 n 密碼學 Cryptology n n 隱藏(kryptos) 訊息(logos)

歷史 – Vigenère Cipher 改進：Blaise de Vigenère 發明多字母替換 密碼(polyalphabetic substitution cipher) n Vigenère cipher

歷史 – Vigenère Cipher 改進：Blaise de Vigenère 發明多字母替換 密碼(polyalphabetic substitution cipher) n Vigenère cipher 逐漸被各國採用 n

歷史 – Vigenère Cipher n Vigenère cipher n 明文：ABCDEFGHIJKLMNOPQRSTUVWXYZ 組一：ZYXWVUTSRQPONMLKJIHGFEDCBA 組二：LMNOPQRSTUVWXYZABCDEFGHIJK n n n

歷史 – Vigenère Cipher n Vigenère cipher n 明文：ABCDEFGHIJKLMNOPQRSTUVWXYZ 組一：ZYXWVUTSRQPONMLKJIHGFEDCBA 組二：LMNOPQRSTUVWXYZABCDEFGHIJK n n n 明文：I CAME I SAW I CONQUERED 密文：R NZXV T HLD T XZMBFPIPW 密文： RNZXVTHLDTXZMBFPIPW

歷史 – Vigenère Cipher n Vigenère cipher 機器： Jefferson cylinder

歷史 – Vigenère Cipher n Vigenère cipher 機器： Jefferson cylinder

歷史 – Vigenère Cipher 1854年， Vigenère cipher 首次被 Charles Babbage 攻破，但没有公開 n Friedrich Kasiski

歷史 – Vigenère Cipher 1854年， Vigenère cipher 首次被 Charles Babbage 攻破，但没有公開 n Friedrich Kasiski 於 1863年攻破 Vigenère cipher，並公開了 n

歷史 – 公開金鑰 1994年，RSA 129被Lenstra領導小組破解。 n “We are happy to announce that…” n RSA-129

歷史 – 公開金鑰 1994年，RSA 129被Lenstra領導小組破解。 n “We are happy to announce that…” n RSA-129 =1143816257578888676692357799761466120102182967212423 625625618429357069352457338978305971235639587050589890 75147599290026879543541 =3490529510847650949147849619903898133417764638493387 843990820577 * 327691329932667095499619881908344614131776429679929425 39798288533

例1 – 密文 n 密文： PFEE SESN RETM MFHA IRWE OOIG MEEN NRMA ENET

例1 – 密文 n 密文： PFEE SESN RETM MFHA IRWE OOIG MEEN NRMA ENET SHAS DCNS IIAA IEER BRNK FBLE LODI

PFEE SESN RETM MFHA IRWE OOIG MEEN NRMA ENET SHAS DCNS IIAA IEER BRNK

PFEE SESN RETM MFHA IRWE OOIG MEEN NRMA ENET SHAS DCNS IIAA IEER BRNK FBLE LODI

例1 – 排列 P R I M E D I F F E R

例1 – 排列 P R I M E D I F F E R E N C E B E T W E E N E L E M E N T S R E S P O N S I B L E F O R H I R O S H I M A A N D N A G A S A K I

例1 – 明文 n 明文： n n n PRIME DIFFERENCE BETWEEN ELEMENTS RESPONSIBLE FOR

例1 – 明文 n 明文： n n n PRIME DIFFERENCE BETWEEN ELEMENTS RESPONSIBLE FOR HIROSHIMA AND NAGASAKI Prime difference between elements responsible for 広島 and 長崎? 還得去找問題的答案…= =

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