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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...

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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...

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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...

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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...

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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...

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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,...

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BATPWN 2020 Crypto - Cryptographer

Cryptographer We are provided with noob.txt which has it contents:- U1FEQEdeS1JDSEBEXlZDUEFYSG5ZQ29TVVBFRFlXRFxvUUJFTA== and noob.py which contents read #!/usr/bin/env python2 # I AM NOOB :) import string from hashlib import md5 from itertools import izip, cycle import base64 import time def xor(data, key): return bytearray(a^b for a, ...

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HSCTF 2020 Misc - N95

N-95 Have you seen a QR code? Definitely. Have you seen a masked QR code? WTF! This is one of my favorite challs from the CTF :wink: So it appears that the QR code has been nicely painted upon. Using stegsolve, we realize that the colors are in every bit plane, so we can’t just read off the QR code easily. And almost no scanner would decod...

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