Importance

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Abstract

The common encryption of content material is provided for decryption at a plurality of destination devices, each destination device having a unique private key of a public-private key pair. A multiple device key exchange is utilized to create a session key for encrypting the content material that is based on each of the public keys of the plurality of destination devices. The content material is encrypted using this session key. A partial key is also created for each of the intended destination devices that relies upon the private key of the destination device to form a decryption key that is suitable for decrypting the encrypted content material. The encrypted content material and the corresponding partial key are communicated to each destination device via potentially insecure means, including broadcast over a public network. Each destination device decrypts the encrypted content material using the decryption key that is formed from its private key and the received partial key. Including or excluding the public key of selected destination devices in the creation of the session key effects selective encryption.

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First Claim