[Writeup] HSCTF 2019

FORENSICS

Chicken Crossing

Use strings and grep command in linux I have a flag.
Flag: hsctf{2_get_2_the_other_side}

Cool Image

The author give us a file with extension is .pdf, but I can open it, check back the header I realize it is the .png file so I just change the extension and get flag.

Cool Image 2

This time I can't open the PNG file. Like cool image 1 I open it in HXD and I see the auther add some stuffs at the header and make operation can't realize the png file. Just delete all of it I have true image:

Slap

Once again, I use strings and grep command in linux and take flag
Flag: hsctf{twoslapsnonetforce}

Logo sucks bad

When I use Stegsolve on the image, I see at top of image have been changed, so I believe the Image changed by LSB. I used zsteg and have flag.
Flag: hsctf{th4_l3est_s3gnific3nt_bbbbbbbbbbbbb}

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