Patent application number | Description | Published |
20080212770 | Key Information Generating Method and Device, Key Information Updating Method, Tempering Detecting Method and Device, and Data Structure of Key Information - A domain key is used to perform chaining decryption with respect to encrypted content key information (ST | 09-04-2008 |
20090041245 | CONFIDENTIAL INFORMATION PROCESSING DEVICE,CONFIDENTIAL INFORMATION PROCESSING APPARATUS, AND CONFIDENTIAL INFORMATION PROCESSING METHOD - A confidential information processing device performs a cryptographic operation on first input data and second input data. A first cryptographic operation circuit includes: a first register for holding first information; and a first cryptographic operation unit. A first pseudo-cryptographic operation circuit includes a second register for holding second information. A first arbitration circuit causes the first cryptographic operation unit to perform the cryptographic operation on the first input data using the first information held in the first register, when a cryptographic operation request for the first input data is made to the first cryptographic operation circuit, and causes the first cryptographic operation unit to perform the cryptographic operation on the second input data using the second information held in the second register, when a cryptographic operation request for the second input data is made to the first pseudo-cryptographic operation circuit. | 02-12-2009 |
20100205461 | METHOD FOR GENERATING DATA FOR DETECTION OF TAMPERING, AND METHOD AND APPARATUS FOR DETECTION OF TAMPERING - In a target apparatus which stores at least one piece of domain key information in a first area and a plurality of pieces of content key information each associated with any one of the domain key information in a second area, a method for generating data for detecting tampering of the content key information. The method comprises the steps of encrypting the content key information associated with one of the domain key information using a chain encryption technique; extracting data at predetermined positions in the encrypted content key information, concatenating the pieces of data extracted at the predetermined positions in the encrypted content key information to obtain concatenated data, performing a hash calculation with respect to the concatenated data to obtain a hash value, storing check values corresponding to the data at the predetermined positions in plain text, in the target apparatus, and storing the hash value in the target apparatus. | 08-12-2010 |
Patent application number | Description | Published |
20120027214 | KEY IMPLEMENTATION SYSTEM - An LSI includes a first decryptor which receives first encrypted key data, and decrypts the first encrypted key data using a first cryptographic key, thereby generating first decrypted key data, a second cryptographic key generator which generates a second cryptographic key based on a second ID, a second encryptor which encrypts the first decrypted key data using the second cryptographic key, thereby generating second encrypted key data, and a second decryptor which decrypts the second encrypted key data using the second cryptographic key, thereby generating second decrypted key data. At a time of key setting, the second encryptor stores the second encrypted key data in a storage unit. At a time of key usage, the second decryptor reads the second encrypted key data from the storage unit. | 02-02-2012 |
20140369496 | KEY IMPLEMENTATION SYSTEM - An LSI includes a first decryptor which receives first encrypted key data, and decrypts the first encrypted key data using a first cryptographic key, thereby generating first decrypted key data, a second cryptographic key generator which generates a second cryptographic key based on a second ID, a second encryptor which encrypts the first decrypted key data using the second cryptographic key, thereby generating second encrypted key data, and a second decryptor which decrypts the second encrypted key data using the second cryptographic key, thereby generating second decrypted key data. At a time of key setting, the second encryptor stores the second encrypted key data in a storage unit. At a time of key usage, the second decryptor reads the second encrypted key data from the storage unit. | 12-18-2014 |