Is this possible to be solved??????

[Reid]

{"challenge":"432200X7962690321903343809D20127728491261004976D781969X8558546311097364610D973308X+18.542-8.464-12.591-28.283-32.916-38.088-18.498-33.868-5.72-40.204-5.185-26.933"}

Answer: 1iD6TbtOVXmml91ba9yk/dB3hBfoWNNAkXdAkxZcHE8=

Im really not sure what this is....