公开(公告)号：SG11202110197QA

公开(公告)日：2021-10-28

申请号：SG11202110197Q

申请日：2020-05-01

Applicant: IBM

Inventor： SADACHARAM SARAVANAN ,  BHIDE MANISH ,  EKAMBARAM VIJAY ,  ANANTHAPUR BACHE VIJAY KUMAR

IPC: H04B11/00 ,  H04W8/00 ,  H04W84/18

Abstract: Relationship discovery can include receiving at a first mobile device a pair of ultrasonic signals conveyed at different frequencies from a second mobile device. The pair of ultrasonic signals can convey, respectively, a second user's contact information in an encrypted form and a key indicator. A contact number can be selected from a first user's contact list electronically stored on the first mobile device. The contact number can be selected based on the key indicator. A mutual contact can be identified in response to decrypting the second user's contact information using the contact number as a decryption key.