ET — Tu Brute

The crew's inside man left a note taped under a desk, written for someone who "already knew the rotation." No key was given — but old habits die hard, and this cipher has exactly 25 things it could be.

Hint: "Julius trusted this trick 2000 years ago. Some things never update their security."

Captured data: YETZ{XM_MN_UKNMX_LABYM_ATIIXGL}

FLAG{ET_TU_BRUTE_SHIFT_HAPPENS}