ํ‹ฐ์Šคํ† ๋ฆฌ ๋ทฐ

๐Ÿ“Œlink: http://ctf-d.com/challenges#์ œ ์นœ๊ตฌ์˜ ๊ฐœ๊ฐ€ ๋ฐ”๋‹ค์—์„œ… (์ ‘์†๋ถˆ๊ฐ€)


โ–ถ๏ธ ์ œ ์นœ๊ตฌ์˜ ๊ฐœ๊ฐ€ ๋ฐ”๋‹ค์—์„œ… ๋ผ๋Š” ๋ฌธ์ œ๋ฅผ ํ’€์–ด๋ณด์ž. ๋จผ์ € ํŒŒ์ผ์„ ๋‹ค์šด ๋ฐ›์•„์„œ ํ™•์ธํ•˜์ž.

 

โ–ถ๏ธ ํŒŒ์ผ์„ ์—ด์–ด๋ณด๋‹ˆ… ์ž‰ ์ด๊ฒŒ ๋ญ์•ผ…. ์‚ฌ์ง„์ด ์ด์ƒํ•˜๋‹ค. ํŒŒ๋ž€ ๋ถ€๋ถ„๋งŒ ๋ณด์ด๋Š”๋ฐ… RGB ๊ฐ’์„ ์ด์šฉํ•ด์„œ ํ‘ธ๋Š” ๋ฌธ์ œ์ธ ๊ฒƒ ๊ฐ™๋‹ค.

 

โ–ถ๏ธ forensically์— ๋“ค์–ด๊ฐ€์„œ ๋‹ค์šด๋ฐ›์€ ์‚ฌ์ง„์„ ๋„ฃ์–ด๋ดค๋‹ค.

#forensic-magnifier

 

Forensically, free online photo forensics tools

Forensically is a set of free tools for digital image forensics. It includes clone detection, error level analysis, meta data extraction and more.

29a.ch

 

โ–ถ๏ธ Level Sweep์— ๋“ค์–ด๊ฐ„๋‹ค. ๋“ค์–ด๊ฐ€๋ฉด ํ™”๋ฉด ์ค‘์•™์—์„œ ์™ผ์ชฝ์œผ๋กœ ํฌ๋ฏธํ•˜๊ฒŒ ๊ธ€์ž๊ฐ€ ๋ณด์ธ๋‹ค. ๋”์šฑ ํ™•์‹คํ•˜๊ฒŒ ๋ณด๊ธฐ์œ„ํ•ด width์„ ์ œ์ผ ์ž‘๊ฒŒ ์ค„์ธ๋‹ค.

 

โ–ถ๏ธ ๊ธ€์ž๊ฐ€ ๋ณด์ด๋Š” ๊ฒƒ์„ ํ™•์ธํ•  ์ˆ˜ ์žˆ๋‹ค. ์กฐ๊ธˆ ๋” ํ™•๋Œ€ํ•ด์„œ ๋ณด๋ฉด ํ”Œ๋ž˜๊ทธ๋ฅผ ์–ป์„ ์ˆ˜ ์žˆ๋‹ค.

 

โ–ถ๏ธ ๋ฌธ์ œ๋ฅผ ํ•ด๊ฒฐํ–ˆ๋‹ค!


๐Ÿ”‘: tjctf{th3_f0x_jump3d_0v3r_m3}

2023/Mar/16 solved.