Secure communication across an insecure communication channel

Abstract

There is provided herein a way to communicate securely across an insecure communication channel without any involvement of a receiving party at the time of sending involving receiving message text and associated provided response text and prompt text. A cryptographic key is generated using the provided response text and the message text is encrypted using the cryptographic key to generate an encrypted message. A package comprising the encrypted message and the prompt text is transmitted across an insecure communications channel. Upon receipt of the package from the communication channel the prompt text can be loaded from the package and given response text can be received responsive to the display of the prompt text. A cryptographic key can then be generated using the given response text so that the encrypted message can be decrypted using the cryptographic key to obtain the message text.

Dependencies are inferred from the claim text.