CN105933121A - Realization method of service discovery mechanism with privacy protection function and system - Google Patents
Realization method of service discovery mechanism with privacy protection function and system Download PDFInfo
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- CN105933121A CN105933121A CN201610221469.7A CN201610221469A CN105933121A CN 105933121 A CN105933121 A CN 105933121A CN 201610221469 A CN201610221469 A CN 201610221469A CN 105933121 A CN105933121 A CN 105933121A
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- Prior art keywords
- service
- service source
- mobile subscriber
- signature
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
- H04L9/3247—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving digital signatures
- H04L9/3257—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving digital signatures using blind signatures
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0407—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the identity of one or more communicating identities is hidden
Abstract
The invention discloses a realization method of a service discovery mechanism with a privacy protection function and a system of the service discovery mechanism with the privacy protection function. The system comprises a service source and a mobile user; the service source encrypts the names of services provided by the service source with a private key, and adds the encrypted names of the services to a bloom filter so as to store the encrypted names of the services in the bloom filter, arranges the bloom filter and a corresponding public key in a beacon, and broadcasts the beacon; the mobile user receives the beacon in the broadcast range of the service source, and obtains the bloom filter and the public key of the service source; the mobile user selects an encryption key by using a blind signature technology to encrypts the name of expected services and sends the encrypted name of the expected services to the service source; after receiving the blinded data, the service source signs the blinded data by using the private key, and returns the signed data to the mobile user; the mobile user decrypts the returned data according to the encryption key so as to obtain the data name of the expected services which is encrypted (signed) by the private key of the service source, and verifies whether a signature is valid by using the public key of the service source; and if the signature is valid, the mobile user judges whether the service source has services expected by the mobile user according to the signed data and the bloom filter sent by the service source previously.
Description
Technical field
The present invention relates to a kind of service discovery mechanisms method and system with privacy protection function,
Belong to mobile social networking technical field.
Background technology
Along with popularizing of intelligent movable equipment, mobile social networking has obtained increasing concern.This
A little intelligent movable equipment have stronger calculating and a storage capacity, and support multiple wave point (as
Bluetooth, WiFi etc.) so that the mobile social activity in adjacent domain is possibly realized.In proximity
In territory in social networks, a major issue is service discovery.Outstanding service discovery application is permissible
The mobility utilizing people fully connects with society, allows user arrive certainly in finding adjacent domain easily
The service that oneself is interested, it is provided that effective Social Interaction.
In traditional service discovery application, mobile subscriber directly receives the service letter that service source provides
Breath, it may be judged whether have oneself desired service.The most in practice, service source and mobile subscriber are same
Take notice of the privacy of oneself, it is undesirable to announced away pellucidly by the attribute of oneself.Present invention utilizes blind
Signature technology so that service source and mobile subscriber are mated in the case of attribute each other not knowing,
Provide reliable secret protection.On the other hand, the efficient convenience of the present invention shows: service source
Service Properties after signature is stored in bloom filter, alleviates the load that data transmit, saves
The computing cost that mobile subscriber judges so that the lookup of service is rapider；Whole service discovery process
All carry out at connectionless mode link layer, it is not necessary to pre-build connection, save communication overhead.
The present invention can solve the problem at aspects such as secret protection, communication overhead and computing costs well.
Summary of the invention
Present invention aim at for the deficiencies in the prior art, it is provided that a kind of one has secret protection
The service discovery mechanisms method and system of function, the method bloom based on Proxy Signature filter
It is applied in the service discovery in mobile social networking so that service source and mobile subscriber are not knowing
Mate in the case of the other side's attribute, it is achieved that secret protection；Service Properties after service source signature
It is stored in bloom filter, alleviates the load that data transmit, save the meter that mobile subscriber judges
Calculate expense.
The present invention solves its technical problem and is adopted the technical scheme that: one has privacy protection function
Service discovery mechanisms method and system, the method use Proxy Signature technology so that service source and
Mobile subscriber is mated in the case of not knowing the other side's attribute, it is achieved that secret protection reliably.
Method flow: step 1: service source initializes；
Step 1-1: service source generates private key and PKI；
Service source chooses two Big prime p, q, makes n=p q,
Randomly select integer e so that it is meetWith gcd (e, n)=1 (wherein gcd (e, n)
Represent the maximum factor altogether of e and n), the d then choosing correspondence makes it meetWithThe PKI of service source is that (n, e), private key is d.
Step 1-2: the various services signatures that service source is provided；
The collection of the m kind service that service source provides is combined intoFor service si, data after signature
ForWherein, the PKI of service source is that (n, e), private key is d.
Step 1-3: the service data after signature are added in bloom filter by service source；Service
The bloom filter of a ω position is chosen in source, chooses k different hash function set
The output area of each hash function is [1, ω].To be added to the m of storage in bloom filter
The collection of individual service data and signature is combined intoBy all in bloom filterCorresponding position puts 1, will m service data and signature adds to
In bloom filter.
Step 1-4: service source broadcast bloom filter and PKI；
Service source is connected without setting up in advance with mobile subscriber, but by bloom filter and PKI
It is put in the beacon beacon of link layer and is broadcasted.In mobile subscriber is in broadcasting area
Time can receive beacon beacon thus obtain bloom filter and the PKI of service source.
Step 2: mobile subscriber encrypts (blinding) desired service；
Mobile subscriber chooses random number a so that (a, n)=1, a are the encryption key of mobile subscriber to gcd.
The collection of desired p the service of mobile subscriber is combined intoFor certain desired service
dsi, the desired service data after encryption (blinding) are ds 'i=dsi·aeMod n, wherein a is for moving
Employ the encryption key at family, (n, e) is the PKI of service source,.Mobile subscriber willIt is sent to clothes
Business source.
Step 3: service source blinds data signature to receive；
Service source receives the mobile subscriber's desired service after blinding, and carries out the process signed with its private key
For: the set of the desired service of the mobile subscriber after what service source received blindFor
ds′i, the data after signature are Sig (ds 'i)=(ds 'i)dmod n.Service source willReturn
To mobile subscriber.
Step 4: mobile subscriber judges whether service source has oneself desired service；
Step 4-1: mobile subscriber's data deciphering (i.e. casting off illiteracy) to returning；
Mobile subscriber signed after dataAfter, for Sig (ds 'i), after casting off illiteracy
Signed data is si=Sig (ds 'i)·a-1Mod n, a are the encryption key of mobile subscriber.I.e.
For the signature set after casting off illiteracy, the collection of the mobile subscriber's desired service namely signed through service source
Close.
Step 4-2: the signed data cast off illiteracy is verified (sign test) by mobile subscriber；
Mobile subscriber is according to Sig (dsi) and service source PKI (n, e), checking
dsi=Sig (dsi)eWhether mod n sets up, if setting up, then sign Sig (dsi) effectively.
Step 4-3: mobile subscriber judges whether service source has oneself desired service；
The desired service of mobile subscriber and signature set thereof areFor the most any one
Individual (dsi, si), in bloom filter, ifCorresponding all positions are 1,
Then explanation service source has user desired service dsi；If at least a correspondence position is 0, then say
Bright service source does not has desired service dsi。
Present invention also offers the system of a kind of service discovery mechanisms with privacy protection function, this is
System comprises two kinds of entity and mutual between them, it may be assumed that service source (utilizes system to declare
Pass and service be provided) and mobile subscriber's (finding service by Privacy Preservation Mechanism).Service source is used
After the various services signatures that its private key will provide, add in bloom filter and store, by bloom
Filter and corresponding PKI are put in the beacon beacon of link layer and are broadcasted.Mobile use
Family receives beacon beacon in service source broadcasting area, it is thus achieved that the bloom filter of service source
And PKI.Mobile subscriber recycles service source after needing oneself desired service is transferred to service source signature
Bloom filter search, but be not intended to again stick one's chin out desired service to service entities,
Hence with Proxy Signature technology, choose encryption key, use special encryption function to desired service
It is encrypted (i.e. blinding), is sent to service source.Service source receives the mobile subscriber's phase after blinding
After hoping service, directly sign to blinding data with its private key, return to mobile subscriber.Mobile use
Family is decrypted (i.e. casting off illiteracy) according to its encryption key to the data returned, and obtains through service source label
The desired service data of name, the public key verifications signature utilizing service source is the most effective.If signature is effectively,
The bloom filter being previously sent in conjunction with the data after signature and service source, it is judged that whether service source has
There is oneself desired service.
Beneficial effect:
1, the present invention uses Proxy Signature technology so that service source and mobile subscriber are not knowing that the other side belongs to
Mate in the case of property, it is achieved that secret protection reliably.
2, whole service discovery process is all carried out at the link layer of connectionless mode, it is not necessary in advance
Set up and connect, save communication overhead.
3, can be provided that substantial amounts of service in view of service source, the present invention is by the clothes after service source signature
Business data are stored in bloom filter and transmit, and alleviate the load that data transmit.
4, mobile subscriber utilizes bloom filter to judge whether service source has desired service, meter
The time complexity calculated is only O (k) number of hash function (k be), alleviates the meter of mobile subscriber
Calculate expense.
Accompanying drawing explanation
Fig. 1 is the total system schematic flow sheet of the present invention
Fig. 2 is the concrete system flow schematic diagram of the present invention
Fig. 3 is that in the present invention, data are joined schematic diagram in bloom filter by service source
Fig. 4 is that in the present invention by bloom filter, mobile subscriber determines whether that expectation is taken
The schematic diagram of business.
Detailed description of the invention
Below in conjunction with Figure of description, the invention is described in further detail.
Symbol and the implication thereof of the present invention include:
As in figure 2 it is shown, native system comprises two kinds of entity and mutual between them: service
Source and mobile subscriber.Wherein, the Service name bloom filter that service source is responsible for being provided exists
Link layer broadcasts, and encryption (blinding) data sending mobile subscriber are signed；Move
Employ family to be responsible for encrypting (blinding) oneself desired service and judging whether service source has oneself expectation
Service.Illustrating the concrete workflow of system in conjunction with Fig. 2 is:
Service source chooses two Big prime p, q, makes n=p q,
Randomly select integer e so that it is meetWith gcd (e, n)=1 (wherein gcd (e, n)
Represent the maximum factor altogether of e and n), the d then choosing correspondence makes it meetWithThe PKI of service source is that (n, e), private key is d.
The collection of the title (character string) of the m kind service that service source provides is combined intoFor service si,
Data after signature areWherein, the PKI of service source is that (n, e), private key is d.
As it is shown on figure 3, service source chooses the bloom filter of a ω position, choose k different hash
Function setThe output area of each hash function is [1, ω].To be added to bloom
In filter, m service data of storage and the collection of signature are combined intoBy bloom
Filter ownsCorresponding position puts 1, will m service data and
Signature has added in bloom filter.
Service source is connected without setting up in advance with mobile subscriber, but by bloom filter and PKI
It is put in the beacon beacon of link layer and is broadcasted.Under actual sight, service source can be used
Data are broadcasted by the WiFi Direct Service Broadcast in WiFi direct-connecting technology.
When mobile subscriber is in broadcasting area, can correspondingly use WiFi Direct Service
Discovery can receive bloom filter and the PKI of service source broadcast.Mobile subscriber chooses
Random number a so that (a, n)=1, a are the encryption key of mobile subscriber to gcd.Mobile subscriber expects
To the collection of title (character string) of p service be combined intoFor certain desired clothes
Business dsi, the desired service data after encryption (blinding) are ds 'i=dsi·aeMod n, wherein a is
The encryption key of mobile subscriber, (n, e) is the PKI of service source,.Mobile subscriber willIt is sent to
Service source.
The set of the desired service of the mobile subscriber after what service source received blindFor
ds′i, the data after signature are Sig (ds 'i)=(ds 'i)dmod n.Service source willReturn
To mobile subscriber
Mobile subscriber signed after dataAfter, for Sig (ds 'i), the signature after casting off illiteracy
Data are si=Sig (ds 'i)·a-1Mod n, a are the encryption key of mobile subscriber.It is de-
Signature set after blind, the set of the mobile subscriber's desired service namely signed through service source.Move
Employ family according to Sig (dsi) and service source PKI (n, e), verify dsi=Sig (dsi)eWhether mod n
Setting up, if setting up, then sign Sig (dsi) effectively.The desired service of mobile subscriber and signature collection thereof
It is combined intoAs shown in Figure 4, for wherein any one (dsi, si), at bloom filter
In, ifCorresponding all positions are 1, then explanation service source has user's expectation
Service dsi；If at least a correspondence position is 0, then explanation service source does not has desired service dsi。
Claims (9)
1. a service discovery mechanisms implementation method with privacy protection function, it is characterised in that described side
Method comprises the steps:
Step 1: service source firstly generates private key and PKI, then adds with the various Service names that private key is provided
Close, i.e. after signature operation, add in bloom filter and store, finally by bloom filter and public affairs
Key is broadcasted by beacon beacon；
Step 2: mobile subscriber receives beacon beacon in service source broadcasting area, it is thus achieved that service source
Bloom filter and PKI, mobile subscriber chooses encryption key, it would be desirable to the service encryption obtained, the blindest
Change operation and be sent to service source；
Step 3: service source receives the mobile subscriber's desired service attribute data after blinding, and carries out with its private key
Encryption, i.e. signs, returns to mobile subscriber；
Step 4: mobile subscriber according to encryption key to return data deciphering, i.e. cast off illiteracy, obtain through service
The desired service data of source private key signature, the public key verifications signature utilizing service source is the most effective, if signature has
Effect, the bloom filter being previously sent in conjunction with the data after signature and service source, it is judged that whether service source has
There is oneself desired service.
A kind of service discovery mechanisms implementation method with privacy protection function the most according to claim 1,
It is characterized in that, in described method step 1, service source generates private key and PKI and provides it with private key
The process of various services signatures is: service source chooses two Big prime p, q, makes n=p q,Randomly select integer e so that it is meetWith
(e, n)=1 (wherein gcd (e n) represents the maximum factor altogether of e and n), then chooses corresponding d and makes gcd
It meetsWithThe PKI of service source be (n, e), private key is d,
The collection of the m kind service that service source provides is combined intoFor service si, the data after its signature are
A kind of service discovery mechanisms implementation method with privacy protection function the most according to claim 1,
It is characterized in that, in described method step 1, service source adds the service data after signature to bloom
Step in filter is: service source chooses the bloom filter of a ω position, chooses k different hash
Function setThe output area of each hash function is [1, ω], to be added to bloom
In filter, m service data of storage and the collection of signature are combined intoBy bloom filter
In allCorresponding position puts 1, will m service data and signature adds to
In bloom filter.
A kind of service discovery mechanisms implementation method with privacy protection function the most according to claim 1,
It is characterized in that, in described method step 1, service source is connected without setting up in advance with mobile subscriber, but
Bloom filter and PKI are put in the beacon beacon of link layer and are broadcasted, use when mobile
Family can receive beacon beacon when being in broadcasting area thus obtain the bloom filter of service source
And PKI.
A kind of service discovery mechanisms implementation method with privacy protection function the most according to claim 1,
It is characterized in that, in described method step 2, mobile subscriber chooses encryption key, it would be desirable to the service obtained
Encryption, the process i.e. blinded is: mobile subscriber chooses random number a so that (a, n)=1, a are for mobile for gcd
The encryption key of user, the collection of desired p the service of mobile subscriber is combined intoFor certain phase
Hope the service ds obtainedi, the desired service data after encryption (blinding) are ds 'i=dsi·aeMod n, its
Middle a is the encryption key of mobile subscriber, and (n, e) is the PKI of service source, and mobile subscriber willIt is sent to
Service source.
A kind of service discovery mechanisms implementation method with privacy protection function the most according to claim 1,
It is characterized in that, in described method step 3, service source receives the mobile subscriber's desired service after blinding,
The process carrying out signing with its private key is: the desired service of the mobile subscriber after what service source received blind
SetFor ds 'i, the data after signature are Sig (ds 'i)=(ds 'i)dMod n, service source willReturn to mobile subscriber.
A kind of service discovery mechanisms implementation method with privacy protection function the most according to claim 1,
It is characterized in that, in described method step 4, mobile subscriber utilizes its encryption key data deciphering to returning,
I.e. cast off illiteracy, obtain through service source signature desired service data, utilize service source public key verifications signature be
No effective process is: mobile subscriber signed after dataAfter, for Sig (ds 'i),
Signed data after casting off illiteracy isA uses for mobile
The encryption key at family, d is the private key of service source,It is the signature set after casting off illiteracy, the most just
It is the set of mobile subscriber's desired service through service source private key signature, according to signature-verification process
Sig(dsi) and service source PKI (n, e), verify dsi=Sig (dsi)eWhether mod n sets up, if setting up,
Then sign Sig (dsi) effectively.
A kind of service discovery mechanisms implementation method with privacy protection function the most according to claim 1,
It is characterized in that, in described method step 4, mobile subscriber combine signature after data and service source previously sent out
The bloom filter sent, it is judged that whether service source has the process of oneself desired service is: mobile subscriber
Desired service and signature set thereof areFor wherein any one
(dsi, Sig (dsi)), in bloom filter, ifCorresponding all positions are equal
Be 1, then explanation service source has user's desired service dsi；If at least a correspondence position is 0, then do not have
User's desired service dsi。
9. the system of a service discovery mechanisms with privacy protection function, it is characterised in that: described system
Comprise two kinds of entity and mutual between them, it may be assumed that service source and mobile subscriber, described service
Source with its private key will provide various services signatures after, add in bloom filter store, by bloom
Filter and corresponding PKI are put in the beacon beacon of link layer and are broadcasted, and mobile subscriber exists
Beacon beacon is received, it is thus achieved that the bloom filter of service source and PKI in service source broadcasting area,
Mobile subscriber recycles the bloom of service source after needing oneself desired service is transferred to service source signature
Filter searches, but is not intended to again stick one's chin out desired service, hence with Proxy Signature to service entities
Technology, chooses encryption key, uses special encryption function to be encrypted desired service, i.e. blinds,
It is sent to service source, after described service source receives the mobile subscriber's desired service after blinding, with its private key pair
Blind data directly to sign, return to mobile subscriber, described mobile subscriber according to its encryption key to returning
The data returned are decrypted, and i.e. cast off illiteracy, and obtain the desired service data through service source signature, utilize service
The public key verifications signature in source is the most effective, if signature effectively, was previously sent out in conjunction with the data after signature and service source
The bloom filter sent, it is judged that whether service source has oneself desired service.
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