End-to-end encryption for multiple recipient devices

A first device comprising:

• a processor configured to execute a method comprising:
• transmitting a registration request to a communication component for generating a first registration for a first device having a mobile device number;
• receiving a notify message from the communication component, wherein the notify message comprises an indication of a second registration of a second device having the mobile device number and comprising a second device public key of the second device;
• and
• determining whether the second device is being spoofed by determining whether a second device public key matches the second device public key within the notify message.

A non-transitory computer-readable medium storing instructions that when executed facilitate performance of operations comprising:

• transmitting a registration request to a communication component for generating a second registration for a second device sharing a mobile device number with a first device;
• receiving a notify message from the communication component, wherein the notify message comprises an indication of a first registration of the first device and comprising a first device public key of the first device;
• and
• transmitting a secure communication invite to the second device, wherein the secure communication invite is usable to determine whether the first device is being spoofed.