The Pipeline

A three-stage obfuscation pipeline was applied in order:
  1. reverse the string
  2. XOR every byte with 0x13
  3. Base64-encode

Undo it (last step first):

bmB3YXJkeHBycUx2fXp/dmN6Y0x2e2dMf3Z2Y2h8eHpyYA==