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Cryptosystem, cryptographic communication method, encryption device, key-generating device, decryption device and content server device

A technology of key generation device and cryptographic system, which is applied to secure communication devices, public keys for secure communications, and key distribution, which can solve problems such as inability to encrypt

Active Publication Date: 2015-03-11
NIPPON TELEGRAPH & TELEPHONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, it cannot be encrypted without the receiver generating a public key

Method used

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  • Cryptosystem, cryptographic communication method, encryption device, key-generating device, decryption device and content server device
  • Cryptosystem, cryptographic communication method, encryption device, key-generating device, decryption device and content server device
  • Cryptosystem, cryptographic communication method, encryption device, key-generating device, decryption device and content server device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0190]

[0191] In recent years, extended ciphers of ID-based ciphers called functional ciphers have become a topic. Functional encryption consists of the following four algorithms (Setup, KeyGen, Enc, Dec). The outline of the protocol is as follows.

[0192] "Protocol FE"

[0193] · Setup(1 λ )→(pk,sk): setting algorithm

[0194] With security parameter 1 λ As input, a probabilistic polynomial-time algorithm that outputs the public parameters pk and the master key sk

[0195] ·KeyGen(sk,i)→sk i : key generation algorithm

[0196] Take the master key sk and the key identifier i as input, and output the secret key sk corresponding to the key identifier i i The probabilistic polynomial-time algorithm for

[0197] Enc(pk,j,x)→c j :Encryption Algorithm

[0198] Take the public parameter pk, the receiver identifier j and the information (plaintext) x of the encrypted object as input, and output the ciphertext c j The probabilistic polynomial-time algorithm for

[019...

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Abstract

A cryptographic communication technology that is based on functional encryption and that can operate flexibly is provided. A conversion rule information pair is determined in advance, which has attribute conversion rule information prescribing a conversion rule for converting attribute designation information to attribute information used in a functional encryption algorithm and logical expression conversion rule information prescribing a conversion rule for converting logical expression designation information to logic information used in the functional encryption algorithm. One kind of conversion rule information included in the conversion rule information pair is used to obtain first attribute information or first logic information from input information. The first attribute information or the first logic information is used for encryption. Encryption information is decrypted with a decryption key generated by using second attribute information or second logic information obtained from user information by using the other kind of conversion rule information.

Description

technical field [0001] The present invention relates to cryptographic communication technology, more specifically, to the cryptographic communication technology based on functional cipher. Background technique [0002] Conventionally, as cryptographic techniques, for example, public key cryptography, public key cryptography, and the like are known. [0003] Public key cryptography is a method in which the sender of a message encrypts the message with a public key to obtain an encrypted message, and the receiver uses the same public key as the sender to decrypt the encrypted message to obtain the message. Therefore, a procedure for securely possessing a public key between a sender and a receiver is required. [0004] Public key cryptography is, (1) the receiver prepares a unique public key and its corresponding unique secret key, (2) the sender uses the receiver's public key to encrypt the message to obtain the encrypted message, (3 ) The receiver obtains the message by dec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/08
CPCH04L9/0861H04L9/0847H04L9/3073H04L9/0836H04L9/14H04L9/085H04L9/08H04L9/30
Inventor 小林铁太郎竹内格知加良盛
Owner NIPPON TELEGRAPH & TELEPHONE CORP
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