Patent ID: 7242772
Filing Date: 2007-07-10
Classification: H04N

Abstract:
1. A data transfer apparatus for secure transfer from a digital data source to a digital data receiver of a plurality of data blocks each data block comprising plural frames of a digital video image, the apparatus comprising: (a) an encryption key generator for providing encryption keys wherein a respective encryption key is assigned to each data block of the plurality of data blocks and a block synchronization index is provided indicating a correspondence between said encryption key and said data block, said block synchronization index is computed using a pseudo-random number generator; (b) an encryption engine that, for each said data block, produces an encrypted data block using said encryption key from said encryption key generator; (c) a data transmission channel for delivering said encrypted data block from said encryption engine to the digital data receiver; (d) a key transmission channel for delivering said encryption key from said encryption key generator to the digital data receiver; (e) a block synchronization data channel for delivering said block synchronization index from said encryption key generator to the digital data receiver; (f) a memory for storing the encryption keys at the digital data receiver; and (g) said digital data receiver including a decryption engine that is responsive to said synchronization index for mapping each key in a memory to a respective encrypted data block for use in decryption of the respective data block.