We Chall-Training: Crypto - Caesar I-Writeup

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We Chall-Training: Crypto - Caesar I-Writeup

题目链接：http://www.wechall.net/challenge/training/crypto/caesar/index.php

题目：

又是水题，很明显的凯撒加密，同时给了凯撒加密的方式：

自己推导，或者直接找在线解密工具即可，如下图，得到所有可能的组合：

在所有的组合中：

XLI UYMGO FVSAR JSB NYQTW SZIV XLI PEDC HSK SJ GEIWEV ERH CSYV YRMUYI WSPYXMSR MW VWJJQKGSRVJF
YMJ VZNHP GWTBS KTC OZRUX TAJW YMJ QFED ITL TK HFJXFW FSI DTZW ZSNVZJ XTQZYNTS NX WXKKRLHTSWKG
ZNK WAOIQ HXUCT LUD PASVY UBKX ZNK RGFE JUM UL IGKYGX GTJ EUAX ATOWAK YURAZOUT OY XYLLSMIUTXLH
AOL XBPJR IYVDU MVE QBTWZ VCLY AOL SHGF KVN VM JHLZHY HUK FVBY BUPXBL ZVSBAPVU PZ YZMMTNJVUYMI
BPM YCQKS JZWEV NWF RCUXA WDMZ BPM TIHG LWO WN KIMAIZ IVL GWCZ CVQYCM AWTCBQWV QA ZANNUOKWVZNJ
CQN ZDRLT KAXFW OXG SDVYB XENA CQN UJIH MXP XO LJNBJA JWM HXDA DWRZDN BXUDCRXW RB ABOOVPLXWAOK
DRO AESMU LBYGX PYH TEWZC YFOB DRO VKJI NYQ YP MKOCKB KXN IYEB EXSAEO CYVEDSYX SC BCPPWQMYXBPL
ESP BFTNV MCZHY QZI UFXAD ZGPC ESP WLKJ OZR ZQ NLPDLC LYO JZFC FYTBFP DZWFETZY TD CDQQXRNZYCQM
FTQ CGUOW NDAIZ RAJ VGYBE AHQD FTQ XMLK PAS AR OMQEMD MZP KAGD GZUCGQ EAXGFUAZ UE DERRYSOAZDRN
GUR DHVPX OEBJA SBK WHZCF BIRE GUR YNML QBT BS PNRFNE NAQ LBHE HAVDHR FBYHGVBA VF EFSSZTPBAESO
HVS EIWQY PFCKB TCL XIADG CJSF HVS ZONM RCU CT QOSGOF OBR MCIF IBWEIS GCZIHWCB WG FGTTAUQCBFTP
IWT FJXRZ QGDLC UDM YJBEH DKTG IWT APON SDV DU RPTHPG PCS NDJG JCXFJT HDAJIXDC XH GHUUBVRDCGUQ
JXU GKYSA RHEMD VEN ZKCFI ELUH JXU BQPO TEW EV SQUIQH QDT OEKH KDYGKU IEBKJYED YI HIVVCWSEDHVR
KYV HLZTB SIFNE WFO ALDGJ FMVI KYV CRQP UFX FW TRVJRI REU PFLI LEZHLV JFCLKZFE ZJ IJWWDXTFEIWS
LZW IMAUC TJGOF XGP BMEHK GNWJ LZW DSRQ VGY GX USWKSJ SFV QGMJ MFAIMW KGDMLAGF AK JKXXEYUGFJXT
MAX JNBVD UKHPG YHQ CNFIL HOXK MAX ETSR WHZ HY VTXLTK TGW RHNK NGBJNX LHENMBHG BL KLYYFZVHGKYU
NBY KOCWE VLIQH ZIR DOGJM IPYL NBY FUTS XIA IZ WUYMUL UHX SIOL OHCKOY MIFONCIH CM LMZZGAWIHLZV
OCZ LPDXF WMJRI AJS EPHKN JQZM OCZ GVUT YJB JA XVZNVM VIY TJPM PIDLPZ NJGPODJI DN MNAAHBXJIMAW
PDA MQEYG XNKSJ BKT FQILO KRAN PDA HWVU ZKC KB YWAOWN WJZ UKQN QJEMQA OKHQPEKJ EO NOBBICYKJNBX
QEB NRFZH YOLTK CLU GRJMP LSBO QEB IXWV ALD LC ZXBPXO XKA VLRO RKFNRB PLIRQFLK FP OPCCJDZLKOCY
RFC OSGAI ZPMUL DMV HSKNQ MTCP RFC JYXW BME MD AYCQYP YLB WMSP SLGOSC QMJSRGML GQ PQDDKEAMLPDZ
SGD PTHBJ AQNVM ENW ITLOR NUDQ SGD KZYX CNF NE BZDRZQ ZMC XNTQ TMHPTD RNKTSHNM HR QREELFBNMQEA
THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG OF CAESAR AND YOUR UNIQUE SOLUTION IS RSFFMGCONRFB
UIF RVJDL CSPXO GPY KVNQT PWFS UIF MBAZ EPH PG DBFTBS BOE ZPVS VOJRVF TPMVUJPO JT STGGNHDPOSGC
VJG SWKEM DTQYP HQZ LWORU QXGT VJG NCBA FQI QH ECGUCT CPF AQWT WPKSWG UQNWVKQP KU TUHHOIEQPTHD
WKH TXLFN EURZQ IRA MXPSV RYHU WKH ODCB GRJ RI FDHVDU DQG BRXU XQLTXH VROXWLRQ LV UVIIPJFRQUIE

倒数第四个是一个完整的句子

THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG OF CAESAR AND YOUR UNIQUE SOLUTION IS RSFFMGCONRFB

所以flag即为RSFFMGCONRFB

We Chall的前几道题确实太水，但想到自己入坑CTF时的辛酸，这里还是写下了Writeup

2017-2-5  13:28;38