公开(公告)号：JP2000224411A

公开(公告)日：2000-08-11

申请号：JP2000015753

申请日：2000-01-25

Applicant: IBM

Inventor： DAVID H JAMESON ,  CHARLES P TRESSER ,  CHAI W WOO ,  STEVEN R ABRAMS ,  SHUMUEL WINOGRAD

IPC: G09C1/00 ,  G06F1/00 ,  G06F11/00 ,  G06F11/10 ,  G06F12/14 ,  G06F21/00 ,  G06F21/24 ,  G06T1/00 ,  G11B20/00 ,  G11B20/18 ,  H03M13/01 ,  H04L9/30 ,  H04N1/32 ,  H04N1/387 ,  H04N7/08 ,  H04N7/081

Abstract: PROBLEM TO BE SOLVED: To recognize whether or not a recording object is true or whether or not it is performed by a true author or both of them by hiding an additional message inside an error correction code for the significant contents of a digital message. SOLUTION: In this method, all authentication data A201 are hidden in the error correction code(ECC) 210 used for performing recording. A code to be used for generating three sets (A, W and D) 205 can be based on ciphering 200 and authentication message A is turned to a coded message corresponding to a pair (W and D) instead of the general tacit relation of the authentication data A201 and an optional data set W202 and an auxiliary data set D203 to be recorded. The meaning of the recorded object is not influenced, a standard reader is not only detected but also not influenced and the truthfulness or propriety or both of recording is recognized.