More than Meets the Eye?

Description

CTF: Whitehacks 2021

Is there something here that’s‌​‌​‌‌‌⁠‌​​‌​​​⁠‌‌​​‌​⁠‌‌​​​​⁠‌‌​​‌​⁠‌‌​​​​⁠‌‌‌‌​‌‌⁠‌‌‌‌​‌​⁠‌‌​​‌‌⁠‌‌‌​​‌​⁠‌‌​​​​⁠‌​‌‌‌‌‌⁠‌‌‌​‌‌‌⁠‌‌​​​‌⁠‌‌​​‌​​⁠‌‌‌​‌​​⁠‌‌​‌​​​⁠‌​‌‌‌‌‌⁠‌‌​​​‌‌⁠‌‌​‌​‌​‌‌‌⁠‌​​‌​​​⁠‌‌​​‌​⁠‌‌​​​​⁠‌‌​​‌​⁠‌‌​​​‌⁠‌‌‌‌​‌‌⁠‌‌‌‌​‌​⁠‌‌​​‌‌⁠‌‌‌​​‌​⁠‌‌​​​​⁠‌​‌‌‌‌‌⁠‌‌‌​‌‌‌⁠‌‌​​​‌⁠‌‌​​‌​​⁠‌‌‌​‌​​⁠‌‌​‌​​​⁠‌​‌‌‌‌‌⁠‌‌​​​‌‌⁠‌‌​‌​​​⁠‌​​​​​​⁠‌‌‌​​‌​⁠‌​​​​​​⁠‌‌​​​‌‌⁠‌‌‌​‌​​⁠‌‌​​‌‌⁠‌‌‌​​‌​⁠‌​‌‌‌‌‌⁠‌‌​​​‌‌⁠‌‌​​​​⁠‌‌‌​‌​‌⁠‌​​‌‌‌​⁠‌‌‌​‌​​⁠‌​‌​​‌‌⁠‌​‌‌‌‌‌⁠‌‌‌​‌​​⁠‌‌​​​​⁠‌‌​​​​⁠‌‌‌‌‌​‌‌​​​⁠‌​​​​​​⁠‌‌‌​​‌​⁠‌​​​​​​⁠‌‌​​​‌‌⁠‌‌‌​‌​​⁠‌‌​​‌‌⁠‌‌‌​​‌​⁠‌​‌‌‌‌‌⁠‌‌​​​‌‌⁠‌‌​​​​⁠‌‌‌​‌​‌⁠‌​​‌‌‌​⁠‌‌‌​‌​​⁠‌​‌​​‌‌⁠‌​‌‌‌‌‌⁠‌‌‌​‌​​⁠‌‌​​​​⁠‌‌​​​​⁠‌‌‌‌‌​‌ more than meets the eye?

Solution

Pwned by @teamfreestuff

If you look carefully, there are several invisible unicode characters in the problem description above.

This is clearly unicode steganography. The characters used are:

• WORD JOINER (U+2060)
• ZERO WIDTH SPACE (U+200B)
• ZERO WIDTH NON-JOINER (U+200C)
• ZERO WIDTH NO-BREAK SPACE (U+FEFF)

If we search around, we are able to find an online unicode steganography decrypter.

WH2021{z3r0_w1dth_ch@r@ct3r_c0uNtS_t00}