Mutual multi-factor authentication technology

A computer program product comprising one or more computer readable storage media and program instructions collectively stored on the one or more computer readable storage media, the stored program instructions comprising:

• program instructions to store information relating to a planned in-person meeting between a first user and a second user, the information including a meeting time, a meeting location, and, for each of the first user and the second user:
• (i) a communications identifier associated with a device of the respective user, and (ii) a token identified by the respective user for the meeting;
• program instructions to, in response to receiving an indication that the device of the first user is located at the meeting location at the meeting time, send, to the device of the first user:
• (i) the communications identifier associated with the device of the second user, and (ii) the token identified by the second user for the meeting;
• and
• program instructions to, in response to receiving an indication that the device of the second user is located at the meeting location at the meeting time, send, to the device of the second user:
• (i) the communications identifier associated with the device of the first user, and (ii) the token identified by the first user for the meeting.

A computer system comprising:

• a processor set;
• and
• one or more computer readable storage media;
• wherein:
• the processor set is structured, located, connected and/or programmed to run program instructions stored on the one or more computer readable storage media;
• and the stored program instructions comprise:
• program instructions to store information relating to a planned in-person meeting between a first user and a second user, the information including a meeting time, a meeting location, and, for each of the first user and the second user:
• (i) a communications identifier associated with a device of the respective user, and (ii) a token identified by the respective user for the meeting;
• program instructions to, in response to receiving an indication that the device of the first user is located at the meeting location at the meeting time, send, to the device of the first user:
• (i) the communications identifier associated with the device of the second user, and (ii) the token identified by the second user for the meeting;
• and
• program instructions to, in response to receiving an indication that the device of the second user is located at the meeting location at the meeting time, send, to the device of the second user:
• (i) the communications identifier associated with the device of the first user, and (ii) the token identified by the first user for the meeting.