Regarding the data acquired, each session comprises 8 different capturing blocks (i.e., from Block1 to Block8). In Block1, we asked users to draw all numbers (from 0 to 9). Block2 and Block3 comprise upper- and lower-case letters respectively, with a total of 27 letters each. Block4 is composed of 8 different symbols (i.e., "?", "#", "*", "@", "%", "=", "?", and "?"). It is important to remark that inside each block, characters were randomised before asking users to draw them. This way, each user performs a different character sequence in each session. From Block1 to Block4, the acquisition interface was designed as portrait to provide a better user experience (see Fig. 1, left). After finishing the first 4 blocks focused on performing one single character at a time (one sample per character), we asked users to draw passwords composed of 4 numbers (always "5 7 8 4") in different ways (6 samples in total). In Block5, users performed the password twice using a landscape orientation interface (see Fig. 1, right). We provided the users with a graphical visualization of the numbers while drawing them (i.e., visible mode). Then, in Block6, users had to repeat once the same task considered in Block5 but this time in an invisible mode, i.e., we did not provide to the users any visualization of the numbers while drawing them. The main motivation of this novel acquisition scenario is to protect us against shoulder surfing attacks, as commented in [17]. In Block 7, users had to draw each number of the password inside of each of the four available boxes (two times), considering first a visible mode (see Fig. 1, middle). Finally, in Block8 users had to repeat once the same task considered in Block7 but this time in an invisible mode. In both Block7 and Block8 the acquisition interface was kept portrait to analyse the user experience in different settings.