Telephone caller authentication

A computer program product, comprising a non-transitory computer-readable storage medium having program code embodied therewith, the program code executable by a plurality of processors to:

• receive, by the plurality of processors, a telephone call, initiated by a caller device and received at a recipient device, wherein the telephone call is provided by:
• encrypting caller identification information;
• and
• initiating the telephone call, said initiating comprising:
• providing a voice carrier signal including the caller identification information;
• and
• simultaneously providing a data carrier signal including the encrypted caller identification information;
• decrypt, by the plurality of processors, the encrypted caller identification information at the recipient device;
• and verifying the identity of at least an unknown caller at the recipient device by at least one of a list of verifying techniques, the list consisting of:
• verifying, by the plurality of processors, the authenticity of a certificate used to encrypt the caller identification information;
• and
• comparing, by the plurality of processors, the decrypted caller identification information with the caller identification information from the voice carrier signal.