The hint is found in the sentence. 
Use Blowfish cipher to decode (https://encode-decode.com/blowfish-encrypt-online/)

<img width="904" alt="image" src="https://github.com/lenebread/GiTxHextech-Challenge-Repo/assets/166520861/c7d4dcd7-7469-4f32-982a-dd066ae8d03c">

Information about Blowfish Cipher:
Blowfish cipher is a symmetric-key block cipher that encrypts data in 64-bit blocks.
