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2016年4月9日 星期六
單套字母替代密文
WXR LX TQH TI YKH ILWXY UWRAYLARO UZSOLA-NHE AWEUYTXEXYHPX RQG LX CLGHOE ZXHG ITW XHAZWH GRYR YWRQXPLXXLTQ. LQ XZAK R AWEUYTXEXYHP, YKH HQAWEUYLTQ NHE LX UZSOLA RQG GLIIHWX IWTP YKH GHAWEUYLTQ NHE CKLAK LX NHUY XHAWHY. LQ WXR, YKLX RXEPPHYWE LX SRXHG TQ YKH UWRAYLARO GLIILAZOYE TI IRAYTWLQJ YKH UWTGZAY TI YCT ORWJH UWLPH QZPSHWX, YKH IRAYTWLQJ UWTSOHP. WXR LX PRGH TI YKH LQLYLRO OHYYHWX TI YKH XZWQRPHX TI WTQ WLBHXY, RGL XKRPLW, RQG OHTQRWG RGOHPRQ, CKT ILWXY UZSOLAOE GHXAWLSHG YKH ROJTWLYKP LQ 1977. AOLIITWG ATANX, RQ HQJOLXK PRYKHPRYLALRQ CTWNLQJ ITW YKH ZN LQYHOOLJHQAH RJHQAE JAKV, KRG GHBHOTUHG RQ HVZLBROHQY XEXYHP LQ 1973, SZY LY CRX QTY GHAORXXLILHG ZQYLO 1997.
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RSA IS ONE OF THE FIRST PRACTICAL PUBLIC-KEY CRYPTOSYSTEMS AND IS WIDELY USED FOR SECURE DATA TRANSMISSION. IN SUCH A CRYPTOSYSTEM, THE ENCRYPTION KEY IS PUBLIC AND DIFFERS FROM THE DECRYPTION KEY WHICH IS KEPT SECRET. IN RSA, THIS ASYMMETRY IS BASED ON THE PRACTICAL DIFFICULTY OF FACTORING THE PRODUCT OF TWO LARGE PRIME NUMBERS, THE FACTORING PROBLEM. RSA IS MADE OF THE INITIAL LETTERS OF THE SURNAMES OF RON RIVEST, ADI SHAMIR, AND LEONARD ADLEMAN, WHO FIRST PUBLICLY DESCRIBED THE ALGORITHM IN 1977. CLIFFORD COCKS, AN ENGLISH MATHEMATICIAN WORKING FOR THE UK INTELLIGENCE AGENCY GCHJ, HAD DEVELOPED AN EJUIVALENT SYSTEM IN 1973, BUT IT WAS NOT DECLASSIFIED UNTIL 1997.
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