短短一个多星期能在百度知道里混个四级出来已经是不得了了，mop里是小猫，论坛里是新手，现在终于能在一个网络交流系统中站住脚了。
    回答别人问题的同时，我也时常被一些东西困扰着。前几天有个和我一样想一道题想几年的牛人高分悬赏世界密码破译难题，整死我了。我在网上搜索到了这10道密码破译题，前两道非常简单，我没花多少时间；第四道花了些时间写程序，理论上是译了，但我不懂明文的意思，因为明文它根本就不是英文。现在我在搞第三道，不得了，太难了，一点思路也没有，X的分布和作用之怪让我觉得它根本不是同音密码。有意思的是，网上只看到有前两道的解答。现在我只把前5关帖出来，后面5关帖出来也没用，那不是人能解决的。RSA呀，同志！第5841314520个质数是143979973771，第143979973771个质数是4029421280663。你试着把580155970302167969490173分解成质因数吧。

Stage 1: Simple Monoalphabetic Substitution Cipher
BT JPX RMLX PCUV AMLX ICVJP IBTWXVR CI M LMT'R PMTN, MTN
YVCJX CDXV MWMBTRJ JPX AMTNGXRJBAH UQCT JPX QGMRJXV CI JPX
YMGG CI JPX HBTW'R QMGMAX; MTN JPX HBTW RMY JPX QMVJ CI JPX
PMTN JPMJ YVCJX. JPXT JPX HBTW'R ACUTJXTMTAX YMR APMTWXN,
MTN PBR JPCUWPJR JVCUFGXN PBL, RC JPMJ JPX SCBTJR CI PBR
GCBTR YXVX GCCRXN, MTN PBR HTXXR RLCJX CTX MWMBTRJ
MTCJPXV. JPX HBTW AVBXN MGCUN JC FVBTW BT JPX MRJVCGCWXVR,
JPX APMGNXMTR, MTN JPX RCCJPRMEXVR. MTN JPX HBTW RQMHX,
MTN RMBN JC JPX YBRX LXT CI FMFEGCT, YPCRCXDXV RPMGG VXMN
JPBR YVBJBTW, MTN RPCY LX JPX BTJXVQVXJMJBCT JPXVXCI,
RPMGG FX AGCJPXN YBJP RAMVGXJ, MTN PMDX M APMBT CI WCGN
MFCUJ PBR TXAH, MTN RPMGG FX JPX JPBVN VUGXV BT JPX
HBTWNCL. JPXT AMLX BT MGG JPX HBTW'R YBRX LXT; FUJ JPXE
ACUGN TCJ VXMN JPX YVBJBTW, TCV LMHX HTCYT JC JPX HBTW JPX
BTJXVQVXJMJBCT JPXVXCI. JPXT YMR HBTW FXGRPMOOMV WVXMJGE
JVCUFGXN, MTN PBR ACUTJXTMTAX YMR APMTWXN BT PBL, MTN PBR
GCVNR YXVX MRJCTBRPXN. TCY JPX KUXXT, FE VXMRCT CI JPX
YCVNR CI JPX HBTW MTN PBR GCVNR, AMLX BTJC JPX FMTKUXJ
PCURX; MTN JPX KUXXT RQMHX MTN RMBN, C HBTW, GBDX ICVXDXV;
GXJ TCJ JPE JPCUWPJR JVCUFGX JPXX, TCV GXJ JPE ACUTJXTMTAX
FX APMTWXN; JPXVX BR M LMT BT JPE HBTWNCL, BT YPCL BR JPX
RQBVBJ CI JPX PCGE WCNR; MTN BT JPX NMER CI JPE IMJPXV
GBWPJ MTN UTNXVRJMTNBTW MTN YBRNCL, GBHX JPX YBRNCL CI JPX
WCNR, YMR ICUTN BT PBL; YPCL JPX HBTW TXFUAPMNTXOOMV JPE
IMJPXV, JPX HBTW, B RME, JPE IMJPXV, LMNX LMRJXV CI JPX
LMWBABMTR, MRJVCGCWXVR, APMGNXMTR, MTN RCCJPRMEXVR;
ICVMRLUAP MR MT XZAXGGXTJ RQBVBJ, MTN HTCYGXNWX, MTN
UTNXVRJMTNBTW, BTJXVQVXJBTW CI NVXMLR, MTN RPCYBTW CI PMVN
RXTJXTAXR, MTN NBRRCGDBTW CI NCUFJR, YXVX ICUTN BT JPX
RMLX NMTBXG, YPCL JPX HBTW TMLXN FXGJXRPMOOMV; TCY GXJ
NMTBXG FX AMGGXN, MTN PX YBGG RPCY JPX BTJXVQVXJMJBCT. JPX
IBVRJ ACNXYCVN BR CJPXGGC.

Stage 2: Caesar Shift Cipher
MHILY  LZA  ZBHL  XBPZXBL  MVYABUHL  HWWPBZ  JSHBKPBZ  JHLJBZ
KPJABT  HYJHUBT  LZA  ULBAYVU

Stage 3: Monoalphabetic Cipher with Homophones
IXDVMUFXLFEEFXSOQXYQVXSQTUIXWF*FMXYQVFJ*FXEFQUQXJFPTUFX
MX*ISSFLQTUQXMXRPQEUMXUMTUIXYFSSFI*MXKFJF*FMXLQXTIEUVFX
EQTEFXSOQXLQ*XVFWMTQTUQXTITXKIJ*FMUQXTQJMVX*QEYQVFQTHMX
LFVQUVIXM*XEI*XLQ*XWITLIXEQTHGXJQTUQXSITEFLQVGUQX*GXKIE
UVGXEQWQTHGXDGUFXTITXDIEUQXGXKFKQVXSIWQXAVPUFXWGXYQVXEQ
JPFVXKFVUPUQXQXSGTIESQTHGX*FXWFQFXSIWYGJTFXDQSFIXEFXGJP
UFXSITXRPQEUGXIVGHFITXYFSSFI*CXC*XSCWWFTIXSOQXCXYQTCXYI
ESFCX*FXCKVQFXVFUQTPUFXQXKI*UCXTIEUVCXYIYYCXTQ*XWCUUFTI
XLQFXVQWFXDCSQWWIXC*FXC*XDI**QXKI*IXEQWYVQXCSRPFEUCTLIX
LC*X*CUIXWCTSFTIXUPUUQX*QXEUQ**QXJFCXLQX*C*UVIXYI*IXKQL
QCX*CXTIUUQXQX*XTIEUVIXUCTUIXACEEIXSOQXTITXEPVJQCXDPIVX
LQ*XWCVFTXEPI*IXSFTRPQXKI*UQXVCSSQEIXQXUCTUIXSCEEIX*IX*
PWQXQVZXLFXEIUUIXLZX*ZX*PTZXYIFXSOQXTUVZUFXQVZKZWXTQX*Z
*UIXYZEEIRPZTLIXTZYYZVKQXPTZXWITUZJTZXAVPTZXYQVX*ZXLFEU
ZTHZXQXYZVKQWFXZ*UZXUZTUIXRPZTUIXKQLPUZXTITXZKQZXZ*SPTZ
XTIFXSFXZ**QJVNWWIXQXUIEUIXUIVTIXFTXYFNTUIXSOQXLQX*NXTI
KNXUQVVNXPTXUPVAIXTNSRPQXQXYQVSIEEQXLQ*X*QJTIXF*XYVFWIX
SNTUIXUVQXKI*UQXF*XDQXJFVBVXSITXUPUUQX*BSRPQXBX*BXRPBVU
BX*QKBVX*BXYIYYBXFTXEPEIXQX*BXYVIVBXFVQXFTXJFPXSIWB*UVP
FXYFBSRPQFTDFTXSOQX*XWBVXDPXEIYVBXTIFXVFSOFPEIXX*BXYBVI
*BXFTXSILFSQXQXQRPBUIV

Stage 4: Vigenere cipher
KQOWEFVJPUJUUNUKGLMEKJINMWUXFQMKJBGWRLFN
FGHUDWUUMBSVLPSNCMUEKQCTESWREEKOYSSIWCTU
AXYOTAPXPLWPNTCGOJBGFQHTDWXIZAYGFFNSXCSE
YNCTSSPNTUJNYTGGWZGRWUUNEJUUQEAPYMEKQHUI
DUXFPGUYTSMTFFSHNUOCZGMRUWEYTRGKMEEDCTVR
ECFBDJQCUSWVBPNLGOYLSKMTEFVJJTWWMFMWPNME
MTMHRSPXFSSKFFSTNUOCZGMDOEOYEEKCPJRGPMUR
SKHFRSEIUEVGOYCWXIZAYGOSAANYDOEOYJLWUNHA
MEBFELXYVLWNOJNSIOFRWUCCESWKVIDGMUCGOCRU
WGNMAAFFVNSIUDEKQHCEUCPFCMPVSUDGAVEMNYMA
MVLFMAOYFNTQCUAFVFJNXKLNEIWCWODCCULWRIFT
WGMUSWOVMATNYBUHTCOCWFYTNMGYTQMKBBNLGFBT
WOJFTWGNTEJKNEEDCLDHWTVBUVGFBIJGYYIDGMVR
DGMPLSWGJLAGOEEKJOFEKNYNOLRIVRWVUHEIWUUR
WGMUTJCDBNKGMBIDGMEEYGUOTDGGQEUJYOTVGGBR
UJYS

Stage 5: Beale variation
109 182 6 11 88 214 74 77 153 177 109 195 76 37 188
166 188 73 109 158 15 208 42 5 217 78 209 147 9 81
80 169 109 22 96 169 3 29 214 215 9 198 77 112 8 30
117 124 86 96 73 177 50 161

Stage 6: Playfair cipher
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Stage 7: ADFGVX variation
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Stage 8
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Stage 9: DES
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Stage 10: RSA/DES combination
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