Digital communication biometric authentication

A system, comprising:

• a processor;
• and
• a memory device, the memory device storing instructions, the instructions when executed causing the processor to perform operations, the operations comprising:
• receiving a spoken response to a challenge issued between a sender and a recipient associated with an electronic email message;
• determining, from the spoken response, a textual representation of N integer text words contained within the spoken response;
• querying an electronic database for the textual representation of the N integer text words, the electronic database storing text contained within different electronic email messages previously exchanged between the sender and the recipient;
• receiving a confirmation that the textual representation of the N integer text words matches at least a portion of one of the different electronic email messages previously exchanged between the sender and the recipient;
• and
• sending an authentication message to the sender and to the recipient, the authentication message confirming identities associated with the sender and the recipient.

A memory device storing instructions that when executed cause a processor to perform operations, the operations comprising:

• receiving a spoken response to a challenge issued between parties of an email communication;
• determining, from the spoken response, a textual representation of N integer words;
• querying an electronic database for the textual representation of the N integer words, the electronic database storing different email messages previously exchanged between the parties;
• receiving a confirmation that the textual representation of the N integer words matches at least a portion of one of the different electronic email messages previously exchanged between both the parties;
• and
• sending an authentication message to the parties to the email communication, the authentication message confirming identities associated with the parties of the email communication.