Apparatus for encrypting data

摘要

The device (102-i) has a unit for symmetric encryption of data and another unit for encrypting symmetrically encrypted data using bit sequences (112,114-1 to 114-n). The bit sequence has maximum entropy. The unit for encrypting the symmetrically encrypted data is so designed that a portion of the bit sequence is used for encryption. Successive encryption is executed with varying portion of the bit sequence. The bit sequence remains unchanged. An independent claim is also included for a computer program product, particularly digital storage medium for encrypted communication over a transmission medium.