CrossCTF_2017: BabyPS3

Category: Cryptography Points: 20 Description:

I recently got a copy of Halo 3 but I can't play it on my PS3. Can you help me? Connect to 188.166.248.56:3333

Write-up

Too lazy to bother.

Solution

$ ./solve.py 
old r: 8364401571398143066067379848832222860350238338044007631845501169476969565354042348827510953570636425895903472238608899163183885897774120754022815911786614454751521200948493106100051182453792309994273741699405723553993280119266289830122800887605597062974073044056455422865019642516511150463131209185017276252730768642031806273589052297699065045727480856202106885620137935356265602818660316603596341682492900799655991550660716021966632062948661292904486441072144930435256059572212289575923014564617519015681505138522910053776611057691364353420488866594913192728932317406247662378788312109517026591273279758156601377346
new r: 65409437784982297110912581342752010737235883633264011939488505540228075281368
old s: 8491134928540539173129006816238771691567666191650735020206796641741772134526073293506715664988373341439780797575557518847474550835619183189689828274086411643459877582781046031950051957945516435903277889300911870880568935878649112403306479688932954594231255968966401717150853273463731016379239257809032689529287295439638348792885856120391475122177897232811229717220443055588936293770458200188499316556470065963287142937791938991996429518447883433706069568967177429381244787747548839417982454179232935970464558246682348084894438497959415328472314455482714907770279776760887778475436619868752133054777420360552913519427
new s: 71460979304995498564989090988448238723692184125856399038370248726828684133531
[+] Opening connection to 188.166.248.56 on port 3333: Done
Flag: CrossCTF{G30RG3_H0T7_W@S_G00D}
[*] Closed connection to 188.166.248.56 port 3333

Therefore, the flag is CrossCTF{G30RG3_H0T7_W@S_G00D}.

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