UTCTF 2021 – Emoji Encryption

In this challenge, we are presented with a string of emoji and we need to decode it to receive the flag. My approach to this was to begin with the values that we know are true, which in this case is that every flag begins with the value of utflag{.

Knowing that the first 5 characters at u, t, f, l, a, and g respectively, we can see that the first letter of the emoji matches the character being encoded: (U)mbrella, (T)urkey, (F)lame, (L)ion, (A)pple, and (G)uitar. Extrapolating this pattern yields the flag flag{utflag{emojis_be_versatile}

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