Method, device, and program product for keystroke pattern analysis

An electronic device, including:

• at least one processor;
• and
• at least one memory storing computer program instructions, wherein the at least one memory and the computer program instructions are configured to cause, together with the at least one processor, the electronic device to perform actions including:
• acquiring keystroke information of a user on an electronic device, wherein the keystroke information indicates a sequence of characters that are typed sequentially and time information related to typing of corresponding characters in the sequence of characters;
• encoding corresponding characters in the sequence of characters respectively into vectorized representations to obtain a sequence of vectorized representations, wherein different characters are encoded into different vectorized representations;
• superimposing the time information related to the typing of corresponding characters in the sequence of characters respectively to corresponding vectorized representations in the sequence of vectorized representations to obtain a sequence of time-based vectorized representations;
• and
• verifying a keystroke pattern of the user by extracting keystroke behavior features from the sequence of time-based vectorized representations;
• wherein superimposing the time information related to the typing of corresponding characters in the sequence of characters respectively to corresponding vectorized representations in the sequence of vectorized representations includes:
• for each of the corresponding characters in the sequence of characters, superimposing a numerical value representing time information related to the typing of the character to a numerical value in a vectorized representation of the character, wherein the superimposing comprises multiplying the numerical value representing the time information and the vectorized representation of the character;
• wherein the keystroke behavior features characterize the keystroke information of the user;
• and
• wherein verifying a keystroke pattern of the user by extracting keystroke behavior features from the sequence of time-based vectorized representations comprises utilizing a trained keystroke pattern verification model to extract the keystroke behavior features from the sequence of time-based vectorized representations and to compare the extracted keystroke behavior features to a keystroke pattern of a valid user of the electronic device so as to verify the keystroke pattern of the user.

A computer program product tangibly stored on a non-transitory computer-readable medium and including machine-executable instructions, wherein the machine-executable instructions, when executed, cause an electronic device to perform actions including:

• acquiring keystroke information of a user on the electronic device, wherein the keystroke information indicates a sequence of characters that are typed sequentially and time information related to typing of corresponding characters in the sequence of characters;
• encoding corresponding characters in the sequence of characters respectively into vectorized representations to obtain a sequence of vectorized representations, wherein different characters are encoded into different vectorized representations;
• superimposing the time information related to the typing of corresponding characters in the sequence of characters respectively to corresponding vectorized representations in the sequence of vectorized representations to obtain a sequence of time-based vectorized representations;
• and
• verifying a keystroke pattern of the user by extracting keystroke behavior features from the sequence of time-based vectorized representations;
• wherein superimposing the time information related to the typing of corresponding characters in the sequence of characters respectively to corresponding vectorized representations in the sequence of vectorized representations includes:
• for each of the corresponding characters in the sequence of characters, superimposing a numerical value representing time information related to the typing of the character to a numerical value in a vectorized representation of the character, wherein the superimposing comprises multiplying the numerical value representing the time information and the vectorized representation of the character;
• wherein the keystroke behavior features characterize the keystroke information of the user;
• and
• wherein verifying a keystroke pattern of the user by extracting keystroke behavior features from the sequence of time-based vectorized representations comprises utilizing a trained keystroke pattern verification model to extract the keystroke behavior features from the sequence of time-based vectorized representations and to compare the extracted keystroke behavior features to a keystroke pattern of a valid user of the electronic device so as to verify the keystroke pattern of the user.