DDCTFMulTzor-xoortol的使用

使用方式见网址
xortool使用
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3cf912589a2a2aab535d9b732de357138a203cab5d55df3e2ce85a1399322aff5741df060aab7c52892a79e95d5e9d362aa712419a342ce75341d3732bea425a9b732bee5357963d3eab5d55df0674e95d528b7334ee41409e343cf812419a202ce65757d15953df5a56df3535ea5513962063ab7677bc071ff002579c3638b806069d326dbd040bcf3169e90101cc3761ea0a02cf656db8570a82
因为是英文所以出现频率最高为空格命令输入命令
xortool -x -c 20 12.txt

其中下方红色的地方是密钥，此时生成一个文件交xoortool_out里面有一个0.out看下里面的密文已经很像密文了，并且里面出现了flag OCryptnalys,sof1heEn,gmac,pheri+gsys1emennalys,s of 1he En,gma c,pheri+g sys1em ennalys,sof1heEn,gmac,pheri+gsys1emenbled 1he we6tern lliesein Wo7ld Wa7 II t* readesubstKaTeX parse error: Unexpected character: '' at position 18: …ialeamoun1s of ̲orse-&oded 7adi…t hadebeen nciph red u6ing E+igma (achin s. Th,s yie)ded m,litar< inte)ligen&e whi&h, alng wi1h tha1 fromeotheredecry5ted A=is ra!io an! tele5rinte7 tran6missins, wsgivntheecodens giv n theecodensgivntheecodenme Ul1ra. T-is wa6 cons,deredeby we6tern uprem Alli d Com(andereDwigh1 D. E,senho2er toehave 'een “!ecisi3e” toethe A)lied 3ictor<.

Th Enig(a mac-ines 2ere aefamil< of prtabl ciph r mac-ines 2ith rtor s&rambl rs. God op ratin" proc duresi prop rly e+force!, wou)d hav madeethe p)ugboa7d Eni"ma ma&hine 0nbrea.able.eHowev r, mo6t of 1he Ge7man m,litar< forc s, se&ret s rvice6 and &iviliKaTeX parse error: Expected 'EOF', got '&' at position 89: …s th se por pro&̲edure6 thateall… mach,nes t* be r versehengin ered ndthciphrstoeberend th ciph rs toebe rendthciphrstoebered.

T-e Ger(an pl0gboar!-equi5ped E+igma 'ecameeNazi erman<'s pr,ncipa) cryp1o-sys1em. I1 was 'rokeneby th Poli6h Gen ral S1aff’seCiphe7 Bure$u in ecemb r 193w, wit- the idofeFrenc−−supp)iedi+telli"ence(ateriid ofeFrenc--supp)ied i+telli"ence (ateriidofeFrenc−−supp)iedi+telli"ence(ateril obtKaTeX parse error: Expected 'EOF', got '#' at position 6: ined #̲rom aeGerma+ sp…u sha7ed it6 Enig(a-bre$king 1echni4ues a+d tec-nolog< withethe F7ench KaTeX parse error: Unexpected character: '' at position 24: …sh.eDurin" the ̲ermaneinvas,on …cilit,es su5port.eSucce6sful &ooper$tion $mong 1he Po)es, t-e Fre+ch, a+d theeBriti6h at letch)ey Pa7k con1inuedeuntileJune t940, 2hen F7ance 6urren!ered 1o theeGerma+s.

F7om th,s beg,nningi the ritis- Gove7nmenteCode $nd Cy5her S&hool mGC&CSl at B)etchl y Par. buil1 up a+ exte+sive &rypta+alyti& capa’ilityk Init,ally,ethe d crypt,on wa6 main)y of uftwa#fe (G rman KaTeX parse error: Unexpected character: '' at position 142: …g E+igma.eAlan ̲uringi a Ca(bri…n andelogic,an, p7ovide! mucheof th orig,nal t-inkin" thateled t* the !esigneof th cryp1analy1ical 'ombe (achin s tha1 wereeinstr0menta) in e3entua)ly br akingethe n$val E+igma.eHowev r, th Krie"smari+e int7oduce! an E+igma 3ersio+ withea fou7th ro1or fo7 its -boat6, res0ltingein a 5rolon"ed pe7iod w-en th se me6sagesecouldenot b decr<pted.eWith 1he ca5ture *f rel vant &ipherekeys KaTeX parse error: Unexpected character: '' at position 28: …muc- fast r US ̲avy bmbes,eregu…r, ra5id re$ding f U-bat me6sageseresum d.

T-e fla" is: DCTF{udcea3q5ba46s80b0bv23d8a}10643 9}
可能是密钥推算错误。看了一下是第一个密钥出了错误查看一下原先密钥的hex key=7733ff53598b

推算一下第一个密钥为32

a=open("123.txt","rb").read().decode("hex")
key="3233ff53598b".decode("hex")
print("".join([chr(ord(a[i])^ord(key[i%len(key)])) for i in range(len(a))]))

DDCTFMulTzor-xoortol的使用

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