Method and apparatus for transmitting encryption-resultant information and decrypting information
View Patent ↗An information signal is transmitted. The information signal contains 1) encryption-resultant information, 2) an error correction code signal, and 3) decrypting information. The error correction code signal is designed for correction of at least one error in the encryption-resultant information. The error correction code signal is repetitively completed at a completion period. The decrypting information is designed for decryption of the encryption-resultant information. The decrypting information is repetitively completed piece by piece. At least one compete piece of the decrypting information is dispersively placed in a portion of the information signal which corresponds to the completion period of the error correction code signal.
1. A method of transmitting information, comprising the steps of:
encrypting input information into encryption-resultant information;
combining 1) a portion of the encryption-resultant information in every prescribed data interval and 2) a decrypting information piece for decryption of the portion of the encryption-resultant information in the prescribed data interval into a combination-resultant information block;
adding an error correction code signal to the combination-resultant information block to form an error correction data block; and
outputting the error correction data block;
wherein the decrypting information pieces are dispersively placed in the error correction data blocks in a manner such that one decrypting information piece is assigned to one error correction data block and hence every decrypting information piece can be reproduced from a corresponding error correction data block.
2. A method of recording information, comprising the steps of:
encrypting input Information into encryption-resultant information;
combining 1) a portion of the encryption-resultant information in every prescribed data interval and 2) a decrypting information piece for decryption of the portion of the encryption-resultant information in the prescribed data interval into a combination-resultant information block;
adding an error correction code signal to the combination-resultant information block to form an error correction data block; and
recording the error correction data block on a recording medium;
wherein the decrypting information pieces are dispersively placed in the error correction data blocks in a manner such that one decrypting information piece is assigned to one error correction data block and hence every decrypting information piece can be reproduced from a corresponding error correction data block.
3. A method of recording information, comprising the steps of:
encrypting input audio visual information into encryption-resultant information;
combining 1) a portion of the encryption-resultant information in every prescribed data interval and 2) a decrypting information piece for decryption of the portion of the encryption-resultant information in the prescribed data interval into a combination-resultant information block;
adding an error correction code signal to the combination-resultant information block to form an error correction data block; and
recording the error correction data block on a portion of a recording medium which corresponds to a prescribed number of tracks or sectors:
wherein the decrypting information pieces are dispersively placed in the error correction data blocks in a manner such that one decrypting information piece is assigned to one error correction data block and hence every decrypting information piece can be reproduced from a corresponding error correction data block.
4. A method as recited in claim 3 , wherein the recording medium comprises a magnetic tape.
5. A tape-like recording medium formed with slant tracks and loaded with 1) encryption-resultant audio visual information, 2) decrypting information for decrypting the encryption-resultant audio visual Information, and 3) an error correction code signal added to a combination of the encryption-resultant audio visual information and the decrypting information, wherein a portion of the encryption-resultant audio visual information in every prescribed data interval and a piece of the decrypting information used for decrypting the portion of the encryption-resultant information in the prescribed data interval are combined into a combination-resultant information block, and a portion of the error correction code signal is added to the combination-resultant information block to form an error correction data block assigned to a prescribed number of ones among the slant tracks, and wherein pieces of the decrypting information are dispersively placed in error correction data blocks in a manner such that one piece of the decrypting information is assigned to one error correction data block and hence every piece of the decrypting information can be reproduced from a corresponding error correction data block.
6. An apparatus for transmitting information, comprising:
means for encrypting input information into encryption-resultant information;
means for combining 1) a portion of the encryption-resultant information in every prescribed data interval and 2) a decrypting information piece for decryption of the portion of the encryption-resultant information in the prescribed data interval into a combination-resultant information block;
means for adding an error correction code signal to the combination-resultant information block to form an error correction data block; and
means for outputting the error correction data block;
wherein the decrypting information pieces are dispersively placed in the error correction data blocks in a manner such that one decrypting information piece is assigned to one error correction data block and hence every decrypting information piece can be reproduced from a corresponding error correction data block.
7. An apparatus for recording Information, comprising:
means for encrypting input information into encryption-resultant information; means for combining 1) a portion of the encryption-resultant Information in every prescribed data interval and 2) a decrypting information piece for decryption of the portion of the encryption-resultant information in the prescribed data Interval into a combination-resultant information block;
means for adding an error correction code signal to the combination-resultant information block to form an error correction data block; and
means for recording the error correction data block on a recording medium;
wherein the decrypting information pieces are dispersively placed in the error correction data blocks in a manner such that one decrypting information piece is assigned to one error correction data block and hence every decrypting information piece can be reproduced from a corresponding error correction data block.
8. An apparatus comprising:
means for encrypting input information into encryption-resultant information;
means for combining 1) a portion of the encryption-resultant information in every prescribed data interval and 2) a decrypting information piece for decryption of the portion of the encryption-resultant information in the prescribed data interval into a combination-resultant information block;
means for adding an error correction code signal to the combination-resultant information block to form an error correction data block;
wherein the decrypting information pieces are dispersively placed in the error correction data blocks in a manner such that one decrypting information piece is assigned to one error correction data block and hence every decrypting information piece can be reproduced from a corresponding error correction data block.