公开(公告)号：JP2008125064A

公开(公告)日：2008-05-29

申请号：JP2007278473

申请日：2007-10-26

Applicant: Internatl Business Mach Corp ,  インターナショナル・ビジネス・マシーンズ・コーポレーションInternational Business Maschines Corporation

Inventor： BADE STEVEN A ,  GUSKI RICHARD HENRY ,  GLEN ALAN JIYAKUETSUTA ,  DAYKA JOHN C

IPC: H04L9/08

CPC classification number: G06F21/6209 ,  G06F2221/2107

Abstract: PROBLEM TO BE SOLVED: To provide data security and to provide encryption and decryption methods with which data on a medium for a computer are easily operated.
SOLUTION: Access to encrypted data on a removable computer medium such as a computer tape is controlled via a uniquely structured header on the medium, including a symmetric key wrapped by asymmetric encryption and a public key related to asymmetric encryption. Data on the medium are encrypted using the symmetric key. Namely, the symmetric key is unwrapped using a private key and the unwrapped symmetric key is used to decrypt data on the medium.
COPYRIGHT: (C)2008,JPO&INPIT

Abstract translation: 要解决的问题：提供数据安全性并提供用于计算机的介质上的数据易于操作的加密和解密方法。 解决方案：在诸如计算机磁带的可移动计算机介质上访问加密数据通过介质上唯一结构化的头部进行控制，包括由非对称加密包裹的对称密钥和与非对称加密相关的公钥。 使用对称密钥对介质上的数据进行加密。 也就是说，使用私钥解密对称密钥，并且使用解开的对称密钥来解密介质上的数据。 版权所有（C）2008，JPO＆INPIT

公开(公告)号：JPH1069732A

公开(公告)日：1998-03-10

申请号：JP10554397

申请日：1997-04-23

Applicant: IBM

Inventor： HUTCHINS ROBERT ALLEN ,  GLEN ALAN JIYAKUETSUTA ,  ALAN ROBERT CLARKE

IPC: G11B20/14 ,  G11B7/005 ,  G11B19/12 ,  G11B20/18

Abstract: PROBLEM TO BE SOLVED: To provide a readout-detection channel and an improved method for decoding the data stored in a data storing medium. SOLUTION: A readout-detection channel 20 includes a tracking threshold value circuit 34 which generates variable threshold value signals and a detection circuit which can be configured into a plurality of various configurations each of which corresponds to one of a plurality of various data forms. Furthermore, a first embodiment of the readout detection channel 20 includes the structural circuit which automatically selects one structure of the data detection circuit in response to detection in the form of input data stream. This first embodiment allows the data bits coded in a plurality of divergent data forms to be decoded using a singly constructible readout detection channel.