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Information transfer system, encryption device, and decryption device using elliptic curve cryptography

An information transmission system, elliptic curve encryption technology, applied in the field of secret information transmission, can solve problems such as long ciphertext length

Inactive Publication Date: 2007-01-03
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0033] Thus, the elliptic curve ElGamal achieves a higher level of security when compared to other cryptography such as DES, but it has the problem that when the key lengths are equal, the length of the ciphertext is longer

Method used

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  • Information transfer system, encryption device, and decryption device using elliptic curve cryptography
  • Information transfer system, encryption device, and decryption device using elliptic curve cryptography
  • Information transfer system, encryption device, and decryption device using elliptic curve cryptography

Examples

Experimental program
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Effect test

no. 1 example

[0084] The content delivery system 10 related to the first embodiment of the present invention will be described below.

[0085] 1.1 Structure of Content Delivery System 10

[0086] figure 1 The structure of the content delivery system 10 is shown. As shown in the figure, the content delivery system 10 is roughly composed of one content delivery device 100 and n content receiving devices 200. 1 , 200 2 ,..., 200 i ,..., 200 n composition. Here, n is a natural number. For example, when n=1000000, the content delivery system 10 includes 1000000 content receiving devices. The content delivery device 100 is connected to the content receiving device 200 via the Internet 20 1 , 200 2 ,..., 200 n .

[0087] The content delivery device 100 generates the content key KC of the content C as a digital movie work or the like, and encrypts it according to the encryption algorithm Enc of the secret key. 1 , Use the content key KC to encrypt the content C to generate the encrypted content EC. T...

no. 3 example

[0407]The content delivery system 10c (not shown) related to the third embodiment of the present invention will be described below.

[0408] The content delivery system 10c has a similar structure to the content delivery system 10. The following focuses on the differences from the content delivery system 10.

[0409] Like the content delivery system 10, the content delivery system 10c is roughly composed of one content delivery device 100c and n content receiving devices 200c. 1 , 200c 2 ,..., 200c i ,..., 200c n composition. The content delivery device 100c is connected to each content receiving device 200c via the Internet 20 1 , 200c 2 ,..., 200c n .

[0410] 3.1. Structure of content delivery device 100c

[0411] The content delivery device 100c has a similar structure to the content delivery device 100. In detail, the content delivery device 100c includes a transmission / reception unit 101, a content key generation unit 102, a content encryption unit 103, a public key storage ...

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Abstract

To provide a content delivery system which enables a ciphertext to be reduced in size when using the ElGamal cipher. A content delivery device performs elliptic curve encryption on a content key, generates an encrypted content key that includes an x coordinate of an elliptic curve point obtained by the elliptic curve encryption, and outputs the encrypted content key. A content reception device receives the encrypted content key, and calculates a y coordinate of the elliptic curve point using the x coordinate included in the encrypted content key. The content reception device then performs elliptic curve decryption using the elliptic curve point and other information included in the encrypted content key, to generate a decrypted content key.

Description

Technical field [0001] The present invention relates to secret information transmission technology, which uses cryptography for information security. Background technique [0002] In recent years, cryptography has been used in various fields to communicate securely without exposing the content of the communication to third parties. [0003] For example, when a storage medium such as a DVD is transferred, in which content such as music or movies is recorded on the DVD, or when the content is transmitted to many users through a network, the content is encrypted to prevent unauthorized use. [0004] There are mainly two types of cryptography: secret key cryptography and public key cryptography. In secret key cryptography, the same key is used for encryption and decryption. Therefore, the sender (to perform encryption) and the receiver (to perform decryption) must share the key in advance. In public key cryptography, different keys are used for encryption and decryption, and the decr...

Claims

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Application Information

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IPC IPC(8): H04L9/30
Inventor 布田裕一大森基司
Owner PANASONIC CORP
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