RACTF 2020 Crypto - 06
06
It looks like someone already tried to crack this message, but they destroyed all their work. They used a naff shredder though, and we were able to recover the number 143526.
BFPNU DXTEA IDDTK VDSSY NJCYC
HETNS YDWVP ZWHBA FCMAN CDWOV
IZJOB VTNLT NFPKM XIODY UMCJR
XDPAZ QZFRB UXZLZ ZTLVD JJVAK
EYMRT YTMHW XAMPX TWEKC WNSYH
REYBG AZFRQ SMJNN ...
RACTF 2020 Crypto - 05
05
DPKFC LISLA KWMDW ERUKW XPDID
BRADA TRTMO LKKGN YUEIE LDEOC
VRTUM FLCVG RBSVS DTHDK WMHOG
TAECO MWEYM ITWOS SEFKF BEAWK
SAEOK SRSNZ RNEOR LTHIS DWZCO
RQSRA MYVSI RIRGE CZIDR MMVCR
HGBYE WSLSO CWMBU LGKDA DELQU
BWKLF CMWGQ RYSPA EZBDA PIRGW
SQSFA CLUMA RVERU ILKBA ATNOF
CKWWA TCKKI IUSWD EIAPK SWSGO
HCFYM SDODS MUORA TDEKU NRRSG
NETHD WPHRG A...
RACTF 2020 Crypto - 04
04
IOINR EANED GTTEA INEHM ETEIS
PMAON RGNHB BTTWE EEYSC YMOET
PTOAL STEII DAHDE LTNUT MYSOR
OTIEH WEGTN TMHAO YSYWW DNOAA
EDHNG LNNHI OHDGE SSEOT YAEAD
TENRY TITBO TRDHI OMALN DBTOO
DEAUH EFTOR LREVO EHSMS CWEST
AAADY EAIZN RRULT JNTWY SLAOO
ATTHK UTYED GOOMY FOSEF SASDO
NSNAH OSSIO EIBPS ALCCR NDTNO
EMEHA STNEL TIHIE AABED PYTMP
SOOED IUWHS L...
RACTF 2020 Crypto - 03
03
We are now provided with another cipher, and like 02 and 01,
we dont know what cipher is it.
GTHTI UHWSE ESLDL MUSDO RIROA
SRGER TAETL VSSAT OAONT EGESN
EOTNT GWPWI AFLAE OAIYA EAWTT
SMENO LTOTO AIASH RKLIC EEEYO
ESSUR NDBTA TNOES CMORI CEEIW
GDECO HSGEN UISIY EAERE YBEHT
LSRLN ADFHR SNTRM SUACU TTNRH
EWDHA EEIIO RHEND PFOLT TGHSC
DULWT NSN...
RACTF 2020 Crypto - 02
02
Progressing from 01 we get to 02 and are presented with the following ciphertext
KFCHT QXXKR FSAHX IEIYP GYZRX
YXCKK OKYPG YLNIX BQRFU WFKEH
LNYGC VBDGT NVIMF NJJLV HJEJY
PGZFO IKQTL KBJKW TXNEH FVEHD
PQJBG MYEYW IPLRC YNWPM YEKNV
CEKRF SAHXI MFDVG XUTTG MRXIF
TWUGW ZNUJZ UHEBJ FKWLV MDECT
BTHGF VMTGP JFZUM FHFAM UNJPN
HQQGJ AGTCV MYEVZ IPM...
RACTF 2020 Crypto - 01
01
No information about the cipher is provided
LHFKM GMRHC FLMMJ ULXFY JOUFC
FQFXF ZJOKP JOMMU LMRJT FFTBA
JYFFR JZFXG AWJCB ULXFI FFKRF
KPGKH RFWCF MTFRR LHFRI FMQFF
KFLWU JMUFC IOMMU FYCFF KWCYB
MFPQF CFHJG KHMJK FFPMJ PFWCY
BMMUF TMJQJ CVJOM GZMUF CFRRJ
TFMUG KHGAA FHLAH JGKHJ KLKPH
FMMUF TLCCF RMFPK JCTLA YMUFW
CYBMJ HCLBU YMFLT QJOAP PJMUG...
BATPWN 2020 Crypto - Prefixes
Prefixes
package main
import (
"fmt"
"strings"
)
func charCodeAt(st string, ni int) rune {
for i, j := range st {
if i == ni {
return j
}
}
return 0
}
func hexify(st string) string {
var ok string = ""
ltr := []string{"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d...
BATPWN 2020 Crypto: M-ick Maybe
M-ick Maybe
T khbtpdiv exiixlzu rbtw, fsu uzrpzsutsj tswx woz kfm-mxxn fppxrwzu woz jmtsstsj fifsuixmu gzmv cizfrfswiv. T pozmtrozu sx nfitpz wxlfmur otn, woxbjo oz ofu kzzs rdvifmdtsj ltwo nz sxw f itwwiz ts woz nfwwzm xe nv kzueziixl.
Oxlzgzm, f jxxu ifbjo tr f ntjowv jxxu wotsj, fsu mfwozm wxx rpfmpz f jxxu wotsj; wwoz nxmz’r woz ctwv. Rx,...
60 post articles, 8 pages.