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Home Ciphercase 2026 The Blue Signal
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The Blue Signal

The Blue Signal

Author: Akshitha M

This is a OSING based CTF challenge using instagram, github and Google docs.

@capncookmrwhite In the right side we can see the user @capncookmrwhite The picture is colored differently (purple and pink instead of the original blue) pointing to instagram’s iconic colors.

Upon searching the username on instagram we land on a public page with one post image image

Few letters in the caption of the post are capitalized randomly spelling out GITHUB.

image

All are fake except last one

image

download the last html and enter the password image

use base64 decoder image

A google docs will open, all visible text is useless

image image

Hex of sky blue is 00BFFF

Epi number is 11 and it’s morning 11AM

“Where my world leaks into yours” refers to coordinates of shooting location which is John B. Robert Dam with decimal coordinates 35.1381 -106.5156

Use flag format to get answer

CYS{11AM_35.1381_-106.5156_00BFFF}

Flag

CYS{11AM_35.1381_-106.5156_00BFFF}
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