Cipher core in a content protection system
US6324288A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 17, 1999 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | May 17, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/60
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A cipher system having a cipher core to encrypt plaintext data into ciphertext data, and a bus interface coupled to the cipher core to transfer the ciphertext data to a bus. In one embodiment, the cipher core comprises a block assembler to receive words of data and to assemble the words into a block, an encryption function to encrypt the block based on an encryption function key, a block transmitter to receive the encrypted block and to disassemble the encrypted block into encrypted data words, and a controller to control multiple rounds of encryption by the encryption function for the block. In another embodiment, the encryption function is duplicated and the controller is replaced by two controllers, the first controller controlling the first five rounds of encryption of the block and the second controller controlling the second five rounds of encryption of the block.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.