CONTENT TRANSMITTING DEVICE, CONTENT RECEIVING DEVICE AND CONTENT TRANSMITTING METHOD

• US 20100106960A1
• Filed: 01/05/2010
• Published: 04/29/2010
• Est. Priority Date: 06/10/2003
• Status: Active Grant

• Current Assignee: Maxell, Ltd.
• Original Assignee: Hiroo Okamoto, Manabu Sasamoto, Yoshimichi Kudo
• Inventors: KUDO, YOSHIMICHI, OKAMOTO, HIROO, SASAMOTO, MANABU
• Granted Patent: US 8,225,084 B2
• Time in Patent Office: Days
• US Class Current: 713/150
• CPC Class Codes: H04L 63/061 for key exchange, e.g. in peer-to-peer networks cryptographic mechanisms or cryptographic arrangements for key agreement H04L9/0838
• CPC Class Codes: H04L 63/0869 for achieving mutual authentication cryptographic mechanisms or cryptographic arrangements for mutual authentication H04L9/3273

Abstract

Before content transmission, the content transmitting device and the content receiving device mutually authenticate each other to verify that the other device respects copyright and rightfully handles content, and then content is encrypted by shared key data and transmitted. It is arranged that in an authentication process, a time from transmission of an authentication request or a time from transmission of an authentication response until arrival of receipt acknowledgement data is measured and only when a measured time is less than a fixed upper-limit value, content is transmitted.

Claims

1. A content transmitting device comprising:

network communication process means for transmitting and receiving data via a network;

send-content generating means for supplying said network communication device with a content to be transmitted to a content receiving device connected via said network;

authenticating means for receiving an authentication request from said content receiving device and authenticating said authentication request, and issuing in return an authentication request to said content receiving device;

encrypting means for generating key information by key information generated based on information obtained by performing an authentication process by said authenticating means, and carrying out an encryption process of a content to be transmitted to said content receiving device, by using said key information;

timer means for measuring a time from transmission of an authentication request to said content receiving device or a time from transmission of a response to said authentication request from said content receiving device until arrival of acknowledgement of receipt from said content receiving device,

wherein when a measured result by said timer means is larger than a predetermined value, the content is not transmitted to said content receiving device.