To increase the security of handheld devices, we propose awareLESS authentication. Since insensible input prevents the leakage of the key information, it can provide more secure authentication scheme. Experiments that used a pressure sensor show that users can input a preset rhythm by insensible finger motion, and the boundary between insensible and sensible is extended by adding vibration while input. Keywords Authentication, awareLESS, insensible, input, finger motion. ACM Classification Keywords H5.2. User Interfaces.