CHIqueen

그냥 base64 decode 계속 돌려주면된다. import base64 a=open("ciphertext2","r").read() for i in range(100): a = base64.b64decode(a) print(a[:10]) 돌리다가 에러 터지는데 그때 a를 출력해보면 flag가 나온다, UMDCTF-{b@se64_15_my_f@v0r1t3_b@s3}

png니까 zsteg를 한번 돌려봤다. # zsteg -a CoolCoin.png imagedata .. text: "(((&&&\r\r\r" b2,rgb,lsb,xy .. file: , 32 kHz, Monaural b3,g,msb,xy .. file: MPEG ADTS, layer I, v2, Monaural b3,b,msb,xy .. file: MPEG ADTS, layer I, v2, Monaural b3,bgr,msb,xy .. file: ddis/ddif b4,r,msb,xy .. file: MPEG ADTS, layer I, v2, JntStereo b4,g,msb,xy .. text: ["w" repeated 11 times] b4,b,msb,xy .. text: ["w" repeated ..

https://ezgif.com/split Split animated GIF image in frames (free online tool) This online tool is designed to convert an animated GIF (and WebM, APNG, MNG) image into individual frames for editing or viewing them separately. ezgif.com 여기로 가서 프레임별로 짤라줍니다. UMDCTF-{tr4sh1ng_th3_fl0w}