A semiconductor memory device comprises memory cells, a bitline connected to the memory cells, a read circuit including a precharge circuit, and a first transistor connected between the bitline and the read circuit, wherein a first voltage is applied to a gate of the first transistor when the precharge circuit precharges the bitline, and a second voltage which is different from the first voltage is applied to the gate of the first transistor when the read circuit senses a change in a voltage of the bitline.

Semiconductor memory device.

The present invention provides an apparatus for securely acquire a circuit configuration information set corresponding to a new cryptosystem without increasing the number of reconfigurable circuits. A content playback apparatus 100 includes an FPGA 122 that is reconfigurable. The content playback apparatus 100 stores a decryption circuit program that shows the structure of a decryption circuit that executes decryption in accordance with a prescribed cryptosystem. The FPGA is reconfigured in accordance with the program to configure the decryption circuit. The playback apparatus 100 acquires, from outside, an encrypted file that has been generated by encrypting a file including a decryption circuit program corresponding to the new cryptosystem in accordance with the prescribed cryptosystem, and decrypts the encrypted file by the decryption circuit.

Information security device

Secure messages may be sent between senders and recipients using symmetric message keys. The symmetric message keys may be derived from a master key using a key generator at an organization. A gateway may encrypt outgoing message using the derived keys. Senders in the organization can send messages to recipients who are customers of the organization. The recipients can authenticate to a decryption server in the organization using preestablished credentials. The recipients can be provided with copies of the derived keys for decrypting the encrypted messages. A hierarchical architecture may be used in which a super master key generator at the organization derives master keys for delegated key generators in different units of the organization. An organization may have a policy server that generates non-customer symmetric message keys. The non-customer symmetric message keys may be used to encrypt messages sent by a non-customer sender to a recipient at the organization.

Secure messaging system with derived keys

Technologies are provided in example embodiments for analyzing an encrypted network flow. The technologies include monitoring the encrypted network flow between a first node and a second node, the network flow initiated from the first node; duplicating the encrypted network flow to form a copy of the encrypted network flow; decrypting the copy of the encrypted network flow using a shared secret, the shared secret associated with the first node and the second node; and scanning the network flow copy for targeted data.

Encrypted data inspection in a network environment

PROBLEM TO BE SOLVED: To reliably prevent illegal copyingSOLUTION: Data encrypted by a 1394-interface 26 of a DVD player 1 is transmitted to a personal computer 2 and a magneto-optical disk device 3 through a 1394-bus 11 In the magneto-optical disk device 3 which does not permit a user to change its functions, the received data is decrypted by the 1394-interface 36 On the other hand, in the personal computer 2 which permits the user to change its functions, the encrypted data is decrypted by using a time-variant key i at the 1394-interface 49, and the decryption result is further decrypted by using a session key S at an application section 61

Information processing apparatus and information processing method

PURPOSE: To allow a center to conduct cipher communication with a terminal equipment and verification of the terminal equipment without having a cipher information list by writing an ID of a terminal equipment and cipher information in advance to the terminal equipment and to cipher data again and to obtain the cipher information at communication and to allow the center and the terminal equipment to use the cipher information in common. CONSTITUTION: A center 300 keeps ciphering information Kc . The center 300 calculates terminal equipment cipher information Si = Encipher (Kc .IDi ) based on the IDi of the terminal equipment to initialize the terminal equipment 360. The center 300 writes the IDi and the Si to the terminal equipment 360. At the start of cipher communication, an ID information storage device 391 of the terminal equipment 360 at first sends the IDi to a network interface(IF) 380, the IF 380 sends the IDi to a center 300 through a network 350. A terminal cipher information holding equipment sends information Si to a key storage device 393. The center 300 receives the IDi and gives it to a converter 320. The converter 320 receiving information Kc from a storage device 321 calculates the information Si and stores it to a storage device 322. Thus, the center 300 and the terminal equipment 360 use the information Si in common to allow the center 300 and the terminal equipment 360 to conduct cipher communication.

Hiroshi Miyauchi

Papers

Cipher key management equipment