A memory device, including a secure command decoder implementing security logic configured to detect commands carrying an encrypted immediate data payload from a requesting host, authenticate the host as source of the command, decode the immediate data and perform a memory access command called for by a command portion of the decrypted immediate data upon the storage cells of the memory device using the non-command portion of the decrypted immediate data, as well as to encrypt any result from executing the command portion prior to returning the result to the requesting host, and an input/output interface for I/O data units supporting multiple hosts.