Data encryption and decryption using screens and lfsr-generated logic blocks

A data encryption method using a plurality of linear-feedback shift registers (LFSRs), comprising:

• creating a plurality of data blocks each of which comprises a plurality of bits;
• generating a plurality of logic blocks for each of the data blocks, wherein the logic blocks are generated by:
• (a) identifying a plurality of objects each of which comprises a sequence of object bits and (b) processing each of the objects by (i) creating an LFSR seed comprising at least a portion of the object bits of the object, wherein the LFSR seed provides an initial state of an LFSR, (ii) implementing the LFSR to generate a plurality of LFSR outputs, and (iii) using the LFSR outputs to generate one of the logic blocks for each of the data blocks;
• generating at least one screen;
• and
• encrypting the data blocks in accordance with an encryption scheme that transforms a data block into an encrypted data block by:
• (a) modifying the bits of the data block using one or more of the logic blocks generated for the data block to thereby generate a first intermediate state data block;
• (b) remapping the modified bits of the first intermediate state data block using the at least one screen to thereby generate a second intermediate state data block;
• and (c) modifying the remapped bits of the second intermediate state data block using one or more of the logic blocks generated for the data block to thereby generate the encrypted data block.

A data encryption and decryption method using a plurality of linear-feedback shift registers (LFSRs), comprising:

• creating a plurality of data blocks each of which comprises a plurality of bits;
• generating a first logic block, a second logic block, a third logic block, and a fourth logic block for each of the data blocks using a first LFSR, a second LFSR, a third LFSR and a fourth LFSR, respectively;
• generating an encryption screen;
• generating a decryption screen;
• encrypting the data blocks into a plurality of corresponding encrypted data blocks in accordance with an encryption scheme that transforms a data block into an encrypted data block by applying the encryption screen and the first logic block, the second logic block, the third logic block, and the fourth logic generated for the data block, wherein the first and second logic blocks are applied before the encryption screen and the third and fourth logic blocks are applied after the encryption screen;
• and
• decrypting the encrypted data blocks into the corresponding data blocks in accordance with a decryption scheme that transforms the encrypted data block into the data block by applying the decryption screen and the first logic block, the second logic block, the third logic block, and the fourth logic generated for the data block, wherein the third and fourth logic blocks are applied before the decryption screen and the first and second logic blocks are applied after the decryption screen.