Need Keyring Of Public Key

[Bapi Dey]

I am using deb.debian.org

I need a Keyring for my apt. I am not able to find pub key of
8B48AD6246925553.

I use apt-key adv --keyserver http://keyring.debian.org --recv-keys <pubkey>

But return error:- no valid OpenPGP data found. Total number process 0.