WO2020177484A1 - 一种本地化差分隐私城市环卫数据报告和隐私计算方法 - Google Patents
一种本地化差分隐私城市环卫数据报告和隐私计算方法 Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/18—Complex mathematical operations for evaluating statistical data, e.g. average values, frequency distributions, probability functions, regression analysis
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/02—Protecting privacy or anonymity, e.g. protecting personally identifiable information [PII]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/03—Protecting confidentiality, e.g. by encryption
- H04W12/033—Protecting confidentiality, e.g. by encryption of the user plane, e.g. user's traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/029—Location-based management or tracking services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M2250/00—Details of telephonic subscriber devices
- H04M2250/10—Details of telephonic subscriber devices including a GPS signal receiver
Definitions
- Mobile devices represented by smart phones can perceive people and surrounding environmental information anytime and anywhere, so that people can get the status of their environment in time, and better Provide required services for people and society, and promote the continuous development of the field of mobile group perception.
- Mobile group perception provides a new way for people to perceive the world, enabling anyone to perform perception tasks through mobile terminals to participate in the perception process, and provide people with various services.
- Random response technology is the mainstream perturbation mechanism of localized differential privacy protection technology. Random response requires a huge amount of sample data. In most mobile group sensing scenarios, the amount of data for participating users is very limited. Therefore, how to apply random response technology in The scene of small and medium sample mobile group perception needs further research.
- the purpose of the present invention is to overcome the shortcomings of the prior art and provide a localized differential privacy urban sanitation data report and privacy calculation method based on random response.
- the invention applies random response technology to report collection in the field of mobile group perception, aggregates and calculates and analyzes privacy data, obtains the joint distribution of privacy attributes, and realizes the monitoring of urban sanitation distribution.
- a localized differential privacy urban sanitation data report and privacy calculation method the specific steps include:
- the user obtains the user's original real data by locating the location of the sanitation point and judging the garbage volume level of the sanitation point;
- the server receives data uploaded by users and performs statistics and denoising processing on the data
- the server aggregates and calculates the data after the denoising process to obtain the real garbage volume level of each location, which constitutes the urban sanitation distribution map.
- the privacy processing parameters are calculated:
- r represents the number of position reports, and its calculation formula is:
- p represents the probability of selecting the real location, and its calculation formula is:
- f represents the bit flip probability, and its calculation formula is:
- the user obtains the original real data of the user by locating the location of the sanitation point and determining the garbage volume level of the sanitation point, the user locates the location of the sanitation point through the mobile smart device carried, and obtains the sanitation point through the location mapping table.
- the location mapping table is obtained by the server for the location number of each sanitation point in advance.
- the user obtains the level of the garbage volume of the sanitation point.
- the number and the level of garbage are the user's original real data ⁇ i,level>.
- the user performs localized differential privacy processing locally, and the processing steps are:
- the specific processing method is:
- the position set is the union of the real position i and any selected r-1 positions in the position set except i, expressed as:
- the function getRandomElements(A,b) means to return the result of randomly selecting b elements from the set A;
- the position set is the union of r positions arbitrarily selected from the position set except i, expressed as:
- This processing method can ensure that the user's location data meets ⁇ 1 -differential privacy.
- the location set L obtained after the localized differential privacy processing localized differential privacy processing is performed on the garbage volume level data, and in the step of calculating the user’s upload result set R, if the user’s real location i is included in In L, the corresponding item of the real garbage amount is the real garbage amount level level i .
- Use h hash functions to map the garbage volume level level i or level' t to a Bloom filter of length l to obtain a vector S t of length l;
- This processing method ensures that the user's garbage volume level perception data meets ⁇ 2 -differential privacy.
- the statistics and denoising processing method are:
- V ⁇ i L i
- Z represents the user upload data
- F represents the total number of sanitation points
- p represents the actual location selection probability
- r represents the number of location reports
- N represents the number of users
- the server For each upload location i, the server filters out all the report pair data sets Di at the location i . Assuming a total of N i D i of data items, the number of transactions reported as E i, the noise is reported as the number N i -E i, of the amount of waste every level data set statistics as follows S 'i: Calculated per a "1" the total number of X i [j], X i [j] represents a j-th bit of the i-th position, 0 ⁇ j ⁇ l, consisting of a vector X i, X i represents the position number i is received Each digit that arrives is a count of "1";
- Sources of X i consists of four parts, as shown in Table 1.
- the data generation and processing process Since there is a certain error in the frequency estimation in step 1, the data generation and processing process also has a certain randomness, and the value calculated by Z i also has a certain error. Therefore, a certain analysis method is required to obtain the real garbage volume level at position i.
- the real garbage volume level of each location can be calculated, thereby obtaining the urban garbage volume distribution map.
- the present invention has the following beneficial effects:
- the present invention greatly saves the deployment cost of hardware facilities, the communication overhead of network connection and the human resources of equipment operation and maintenance, and fully saves social resources;
- the present invention does not rely on a trusted third-party server, and the data is completely processed by the user on the mobile terminal, which more thoroughly guarantees the user's data privacy and security;
- the present invention increases the speed while maintaining the security of the scheme.
- Figure 1 is a flowchart of a localized differential privacy urban sanitation data report and privacy calculation method.
- Figure 2 is a structural diagram of a localized differential privacy urban sanitation data report and privacy calculation method.
- Fig. 3 is a sample diagram of random disturbance of the garbage volume level in the embodiment of the present invention.
- Figures 1 and 2 are respectively a flowchart and structure diagram of a localized differential privacy urban sanitation data report and privacy calculation method. The specific steps of the method include:
- the user obtains the user's original real data by locating the location of the sanitation point and judging the garbage volume level of the sanitation point;
- the server receives data uploaded by users and performs statistics and denoising processing on the data
- the server aggregates and calculates the data after the denoising process to obtain the real garbage volume level of each location, which constitutes the urban sanitation distribution map.
- the total number of sanitation points in a certain area of the city is 50
- the level of garbage volume has 3 levels, namely High, Middle, and Low.
- the false positive rate of the bloom filter is 0.1
- the optimal bloom filter length is calculated
- the number of hash functions is Privacy processing parameters
- a perceiving user passes a sanitation point, he needs to report the amount of garbage at the sanitation point: first locate the current sanitation point location through the GPS sensor of the mobile device, and then match the sanitation point through the location-number table set in advance If the number of the sanitation point is 12, the user sets the corresponding garbage volume level by observing the amount of garbage. If it is determined that the actual garbage volume level of the sanitation point is Middle, the data ⁇ 12, Middle> is the perception Real perception data of participating users.
- the corresponding vectors are respectively ⁇ High:1000001001000, Middle:0100000000011, Low:1000001000001 ⁇ .
- Each of the corresponding garbage volume levels in the set passes the generated random number and parameters after the Bloom filter Comparing, less than 0.58 remains unchanged, greater than 0.58 to flip, the final uploaded collection is:
- garbage volume level data of each location is filtered out and analyzed separately. For example, all garbage volume level items with location "1" are expressed in the form:
- the garbage volume level corresponding to the maximum value in the vector A is the estimated real garbage volume level at the location.
- the garbage volume levels of all locations can be obtained sequentially through the above process, so as to obtain the garbage volume level distribution map in this area of the city.
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Abstract
Description
| 第0位 | 第1位 | … | 第l位 |
| 1 | 0 | 1 | 0 |
| … | … | … | … |
| 0 | 1 | 1 | 0 |
Claims (8)
- 一种本地化差分隐私城市环卫数据报告和隐私计算方法,其特征在于,具体步骤包括:设置位置隐私参数及垃圾量等级隐私参数,计算隐私处理参数;用户通过定位环卫点位置及判定环卫点垃圾量等级数,得到用户的原始真实数据;对位置及垃圾量等级数据分别进行本地化差分隐私处理并上传到服务器;服务器接收用户上传数据并对数据进行统计及去噪处理;服务器对经过去噪处理后的数据进行聚合计算,得到各个位置的真实垃圾量等级,构成城市环卫分布图。
- 根据权利要求1所述的一种本地化差分隐私城市环卫数据报告和隐私计算方法,其特征在于,所述用户通过定位环卫点位置及判定环卫点垃圾量等级数,得到用户的原始真实数据的步骤中,用户通过携带的移动智能设备定位环卫点位置,并通过映射表得到该环卫点的编号i;用户通过自行判定,环卫点垃圾量的等级数level,编号和垃圾等级数即为用户的原始真实数据<i,level>。
- 根据权利要求4所述的一种本地化差分隐私城市环卫数据报告和隐私计算方法,其特征在于,所述生成一个(0,1)之间的随机数rand,结合隐私处理参数,对位置数据进行本地化差分隐私处理的步骤中,具体处理方法为:对随机数rand及真实位置选中概率p的大小关系进行判断:如果随机数rand小于p,则位置集合为真实位置i与除去i之外的位置集合中任意选择r-1个位置的并集,表示为:L={i}∪getRandomElements(F\{i},r-1)其中,函数getRandomElements(A,b)表示返回从集合A中随机选择b个元素的结果;如果随机数rand大于p,则位置集合为除去i之外的位置集合中任意选择r个位置的并集,表示为:L=getRandomElements(F,r)综上表示为:
- 根据权利要求4所述的一种本地化差分隐私城市环卫数据报告和隐私计算方法,其特征在于,所述根据本地化差分隐私处理后得到的位置集合L,对垃圾量等级数据进行本地化差分隐私处理,计算用户的上传结果集R的步骤中,如果用户的真实位置i包含在L中,真实位置垃圾量的对应项为真实垃圾量等级level i;此时对于位置集合L中的其他位置元素t,其垃圾量等级对应项则在垃圾量等级值集合中等概率随机选择一个等级level′ t,随后对每一个垃圾量等级进行处理,具体处理方法为:采用h个哈希函数将垃圾量等级level i或level′ t映射到长度为l的布隆过滤器,得到一个长度为l的向量S t;对于S t中的每一位S t[j],运行一个随机数生成函数得到一个(0,1)之间的随机数q,如果q<1-f/2,第j位保持不变,如果q>1-f/2,对第j位进行翻转,即原始值为0时,翻转为1,原始值为1时,翻转为0,得到S t′;综上表示为:将每个位置i和对应的处理过后的垃圾等级值S′ i组合成对(i,S′ i),加入到上传结果集合R,得到最后的上传结果集合R。
- 根据权利要求1所述的一种本地化差分隐私城市环卫数据报告和隐私计算方法,其特征在于,所述服务器接收用户上传数据并对数据进行统计及去噪处理步骤中,统计及去噪处理方法为:混合所有用户的上传数据Z,提取上传报告中所有的位置数据,估计每 个位置的真实报告个数E i;对于每个上传位置i,服务器筛选出所有位置i的报告对数据集合D i;假设D i总共有N i条数据项,真实报告个数为E i,则噪声报告个数为N i-E i,对垃圾量等级数据集合S′ i的每一位做如下统计:计算每一位为“1”的总数X i[j],X i[j]表示第i个位置的第j位,0≤j<l,组成一个向量X i,X i表示编号为i的位置收到的每一位为“1”的计数;在真实数据集中,假设原始垃圾量等级经过布隆过滤器后,总共有Z i个“1”,其有(1-f/2)的概率保持为“1”,E i-Z i个“0”,其有f/2的概率翻转为“1”;同理,假设噪声数据的原始垃圾量等级经过布隆过滤器后共有U i个“1”,其有(1-f/2)的概率保持为“1”;N i-E i-U i个“0”,共有f/2的概率翻转为“1”;因此下列等式成立:由于加入的噪声呈均匀分布,上式中的U i能够通过计算得到,因此,上式推导得:由此求得原始真实的垃圾量等级在各个位上的“1”的个数组成的向量Z i。
- 根据权利要求1所述的一种本地化差分隐私城市环卫数据报告和隐私计算方法,其特征在于,所述服务器对经过去噪处理后的数据进行聚合计算,得到各个位置的真实垃圾量等级,构成城市环卫分布图步骤中,将垃圾量等级的所有w个候选值通过布隆过滤器的h个哈希函数处理后,组成一个w·l的矩阵作为特征矩阵Q,经过去噪处理得到的所有Z i[j],,组成长度为l的向量Z i,求解线性回归问题Z i=A·Q,向量A(1·w)中最大值所对应位置的垃圾量等级即为位置i的真实垃圾量等级。
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| CN110022531B (zh) * | 2019-03-01 | 2021-01-19 | 华南理工大学 | 一种本地化差分隐私城市垃圾数据报告和隐私计算方法 |
| CN110569286B (zh) * | 2019-09-11 | 2021-07-27 | 哈尔滨工业大学(威海) | 基于本地差分隐私的活动时序轨迹挖掘的方法 |
| CN112995076B (zh) * | 2019-12-17 | 2022-09-27 | 国家电网有限公司大数据中心 | 一种离散数据频率估计方法、用户端、数据中心及系统 |
| CN111144888B (zh) * | 2019-12-24 | 2022-08-02 | 安徽大学 | 一种差分隐私保护的移动群智感知任务分配方法 |
| CN111563272B (zh) * | 2020-04-30 | 2021-11-09 | 支付宝实验室(新加坡)有限公司 | 信息统计方法及装置 |
| WO2021262155A1 (en) * | 2020-06-23 | 2021-12-30 | Google Llc | Differentially private frequency deduplication |
| CN113206831B (zh) * | 2021-03-31 | 2023-02-14 | 南京邮电大学 | 一种面向边缘计算的数据采集隐私保护方法 |
| CN114553516B (zh) * | 2022-02-18 | 2024-07-09 | 支付宝(杭州)信息技术有限公司 | 一种数据的处理方法、装置及设备 |
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