| Patent application number | Description | Published |
|---|
| 20080253561 | Common-Key Block Encryption Device Common-Key Block Encryption Method, and Common-Key Block Encryption Program - Disclosed is a common-key block encryption device including first Feistel-type hash means that divides a plain text into a PA block and a PB block and adds the PB block, which is compressed by a hash function, and the PA block to generate a unit block intermediate text; unit block encryption means that encrypts the unit block intermediate text to generate a unit block intermediate cipher text; pseudorandom number generation means that generates an intermediate random number based on the unit block intermediate cipher text; addition means that adds the intermediate random number and the PB block and outputs an addition result; second Feistel-type hash means that outputs a result that is a combination of a second addition result, generated based on the addition result compressed by a hash function and the unit block intermediate cipher text, and the addition result; and cipher text output means that outputs the output result as a cipher text. | 10-16-2008 |
| 20090138710 | Message Authentication Device, Message Authentication Method, Message Authentication Program and Storage Medium therefor - A message authentication device, a message authentication method, a message authentication program and a storage medium therefor are provided, so as to realize higher speed processing than an authentication mode of existing block cipher, in combination of block cipher and one of its parts, with theoretical security in accordance with a high efficient preliminary process and with an efficient amount of available memory. The message authentication device includes: input means for inputting a message: padding means for padding the message, setting its length always to a constant of a block length, and outputting the message as a padded message; modified tree hash means for outputting hash values of one block by repeating a process of arranging hash functions with small input/output widths, corresponding to the padded message, generated based on parts of block cipher; adjustment value added encryption means for encrypting the hash values so as to set a tag; and output means for coupling and outputting the tag and the message. | 05-28-2009 |
| 20090196416 | TWEAKABLE BLOCK ENCRYPTION APPARATUS, METHOD, AND PROGRAM - A tweakable block cipher apparatus includes an input unit that receives a pair of a plaintext M and a tweak; an offset calculation unit that calculates a sum of a value (E(K, const)), which is generated by encrypting a constant plaintext (constant const) using a block cipher, and the tweak and outputs a value (G(Ksub, E(K, const)+tweak), which is generated by encrypting the result (E(K, const)+tweak) using a partial block cipher (G), as an offset; an internal encryption unit that calculates a sum of the offset and the plaintext M, encrypts the sum using the block cipher E, calculates a sum (E(K, M+offset)+offset) of the result (E(K, M+offset)) and the offset, and outputs the sum as a ciphertext (C); and an output unit that outputs the ciphertext. | 08-06-2009 |
| 20100329449 | ADJUSTMENT-VALUE-ATTACHED BLOCK CIPHER APPARATUS, CIPHER GENERATION METHOD AND RECORDING MEDIUM - There is provided an adjustment-value-attached block cipher apparatus realizing block cipher processing that the amount of processing is small in adjustment-value-attached block cipher. The adjustment-value-attached block cipher apparatus includes: an encryption section performing encryption by a block cipher system; an input section accepting plaintext, an adjustment value and instruction information indicating first or second cipher processing; and a generator dividing the adjustment value into first and second adjustment values, encrypting the first adjustment value using the encryption section to generate cipher for offset, determining an offset value according to the cipher for offset and the second adjustment value, determining the sum of the offset value and the plaintext, and encrypting the sum using the encryption section to generate first ciphertext when the instruction information indicates the first cipher processing, and encrypting the plaintext using the encryption section to generate second ciphertext when the instruction information indicates the second cipher processing. | 12-30-2010 |
| 20110150225 | ENCRYPTION DEVICES FOR BLOCK HAVING DOUBLE BLOCK LENGTH, DECRYPTION DEVICES, ENCRYPTION METHOD, DECRYPTION METHOD, AND PROGRAMS THEREOF - An encryption device for a block having double block length permutates a plaintext of 2 n bits based on a universal hash function so as to generate first and second intermediate variables of n bits each, encrypts the first intermediate variable with a tweak that is a result in which the second intermediate variable is shortened to m bits using an encryption function for m-bit tweak n-bit block cipher so as to generate a third intermediate variable of n bits, encrypts the second intermediate variable with a tweak that is a result in which the third intermediate variable is shortened to m bits using the encryption function so as to generate a fourth intermediate variable of n bits, concatenates the third and fourth intermediate variables and inversely mingles the concatenated result based on a universal hash function so as to generate a ciphertext of 2 n bits. | 06-23-2011 |
| Patent application number | Description | Published |
|---|
| 20080205316 | COMMUNICATION APPARATUS, COMMUNICATION METHOD AND COMMUNICATION SYSTEM - A communication apparatus includes an image information acquisition unit configured to acquire new image information to be transmitted to a display terminal through a wireless access point, a storage unit configured to temporarily store the image information, a decision unit configured to decide to change a state of a wireless communication processing unit of the display terminal from a power save state to a normal state when an amount of the image information stored in the storage unit is not less than a predetermined threshold value, a message generation unit configured to generate a change instruction message in response to decision of the decision unit, and a transmission unit configured to transmit the change instruction message to the display terminal through the wireless access point to instruct the display terminal to change the state of the wireless communication processing unit from the power save state to the normal state. | 08-28-2008 |
| 20090147014 | Apparatus, method, and recording medium for detecting update of image information - When a processor, which transits from a first mode that causes a guest operating system to operate to a second mode that causes a virtual machine monitor managing the guest operating system to operate, when previously set transition condition is satisfied, transits to the second mode, a determining unit determines a cause or the transition. When it is determined that an execution of a process related to a completion of writing the image information in an image storage unit on the guest operating system is the cause, a detecting unit detects an updated portion representing an unmatched portion of the image information between before and after writing. | 06-11-2009 |
| 20090204957 | VIRTUAL COMPUTER SERVER APPARATUS, AND UPDATE IMAGE DETECTION METHOD - A virtual computer server apparatus includes an image information memory to store image information upon dividing into pages, the page being a memory of a predetermined size, an update unit configured to update the image information stored in the image information memory in accordance with operation of the application program, an update page detection unit configured to detect an update page from the pages storing image information transmitted to the terminal and displayed by the terminal as a display area, an update image detection unit configured to detect the image information updated by the update unit from image information in the update page before updated and image information in the update page after updated. | 08-13-2009 |
| 20100218184 | Information processing device, method, and computer program product - A setting storage unit stores first setting information that defines an operation of a first application that runs on a guest OS and second setting information that defines an operation of a second application that runs on at least one of another guest OS and a host OS. A correspondence storage unit stores first identification information for identifying the first setting information and second identification information for identifying the second setting information, in association with each other. An alternative access gaining unit reads from the correspondence storage unit the second identification information corresponding to the first identification information of the first setting information for which an access request is received, and accesses the second setting information of the second identification information that is read out, in place of the first setting information for which the access request is received. | 08-26-2010 |
