CN106953724A - 动态加密式指纹传感器及动态加密指纹数据的方法 - Google Patents

动态加密式指纹传感器及动态加密指纹数据的方法 Download PDF

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CN106953724A
CN106953724A CN201610546621.9A CN201610546621A CN106953724A CN 106953724 A CN106953724 A CN 106953724A CN 201610546621 A CN201610546621 A CN 201610546621A CN 106953724 A CN106953724 A CN 106953724A
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disposable code
encrypted
circuit
fingerprint sensor
print data
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柳星舟
王宏祥
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eMemory Technology Inc
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Abstract

本发明公开了一种动态加密式指纹传感器，包括用于感测指纹并产生指纹数据的电容阵列，用于储存一次性码及加密算法指标的嵌入式非挥发性内存，用于根据一次性码及加密算法指标将电容阵列产生的指纹数据进行加密的逻辑演算电路，以及用于控制电容阵列、嵌入式非挥发性内存及逻辑演算电路的控制电路。

Description

动态加密式指纹传感器及动态加密指纹数据的方法
技术领域
本发明涉及一种指纹传感器，特别是涉及一种利用一次性码将指纹数据动态地进行加密的指纹传感器。
背景技术
指纹传感器常被用来感测指纹，并产生指纹数据，再进一步将指纹数据传送至处理器中。例如，指纹传感器会将指纹数据传入中央处理器或是微控制单元(Microcontroller Unit)。以目前的技术而论，指纹数据由指纹传感器传送至处理器的过程中，并无法保证其传输安全。换句话说，指纹数据在传输的过程中，可能会被未经授权的用户窃取或是盗用。
图1是传统处理指纹数据的系统10的方块图。系统10包括处理器12以及指纹传感器16。处理器12透过传输路径14与指纹传感器16进行通讯。随后，处理器12将会对由指纹传感器16传来的指纹数据请求验证。然而，当指纹数据在处理器12与指纹传感器16之间进行传输时，指纹数据的传输状态或参数可利用硬件或是软件的方式侧录。换句话说，未经授权的用户只要将相同的指纹数据(可能利用硬件或是软件非法复制的指纹数据)由传输路径14传送至处理器12，指纹数据可被处理器12验证。因此，由于传输路径14上的指纹数据容易遭到窃取或是记录，未经授权的用户很容易地利用不法窃取或复制的指纹数据破解处理器12的指纹验证程序。甚至，就算指纹数据由指纹传感器16传送至处理器12前有进行加密，若加密密钥不常更新，加密后的指纹数据仍有高机率被盗用且被解密，因此，未经授权的用户仍可以破解处理器12的指纹验证程序。
发明内容
本发明实施例描述一种动态加密式指纹传感器，包括电容阵列、嵌入式非挥发性内存、逻辑演算电路以及控制电路。电容阵列用于感测指纹，并产生指纹数据，嵌入式非挥发性内存用于储存一次性码及加密算法指标。逻辑演算电路用于根据一次性码及加密算法指标，将电容阵列产生的指纹数据进行加密。控制电路耦接于电容阵列、嵌入式非挥发性内存及逻辑演算电路，用于控制电容阵列、嵌入式非挥发性内存及逻辑演算电路。逻辑演算电路包括加密电路，加密电路包括多个逻辑加密电路，加密电路根据加密算法指标，由多个逻辑加密电路中选择出至少一个逻辑加密电路。加密电路根据一次性码，利用至少一个逻辑加密电路将指纹数据加密。
本发明另一个实施例描述一种指纹数据的动态加密方法，包括指纹传感器的电容阵列感测指纹，并产生指纹数据；接收加密算法指标及一次性码；根据加密算法指标，由多个逻辑加密电路中选择出至少一个逻辑加密电路；以及根据一次性码，将电容阵列所产生的指纹数据利用至少一个逻辑加密电路进行加密。
本发明的指纹数据的动态加密方法的特色在于使用了一次性码对指纹数据进行加密。因此具备以下优点，指纹数据的动态加密方法提供了两层式的安全保护。第一层，由于使用了一次性码对指纹数据进行加密，未经授权的用户对指纹数据译码会有很高的困难度。第二层，由于本发明根据加密算法指标动态地选择逻辑加密电路将指纹数据加密，因此提供了更高等级的安全保护。换句话说，除非同时知道一次性码以及被选择的加密电路集合的用户，才有机会将对应的指纹数据进行译码。
附图说明
图1是传统处理指纹数据的系统的方块图。
图2是本发明用于处理指纹数据的系统的方块图。
图3是图2的指纹传感器中，逻辑演算电路的方块图。
图4是图2的指纹传感器中，嵌入式非挥发性内存的方块图。
图5是本发明加密指纹数据的方法的流程图。
其中，附图标记说明如下：
10及20 系统
12及22 处理器
14及24 传输路径
16及30 指纹传感器
32 逻辑演算电路
34 嵌入式非挥发性内存
36 控制电路
38 电容阵列
50 加密电路
52 第一逻辑加密电路
54 第二逻辑加密电路
60 新的一次性码产生电路
70 产品识别数据
72 一次性码
74 加密算法指标
S100至S112 步骤
具体实施方式
图2是本发明用于处理指纹数据的系统20的方块图。系统20包括处理器22以及指纹传感器30。指纹数据透过传输路径24，在处理器22与指纹传感器30之间进行通讯。指纹传感器30包括逻辑演算电路32、嵌入式非挥发性内存(Embedded Non-volatile Memory)34、控制电路36以及电容阵列38。电容阵列38用于感测指纹，并产生指纹数据。嵌入式非挥发性内存34用于储存一次性码(One-time Code)及加密算法指标。逻辑演算电路32用于根据一次性码及加密算法指标将电容阵列38产生的指纹数据进行加密。控制电路36可耦接于电容阵列38、嵌入式非挥发性内存34及逻辑演算电路32，用于控制电容阵列38、嵌入式非挥发性内存34及逻辑演算电路32。并且，指纹数据会根据电容阵列38被手指触控的位置(指纹产生的位置)不同而有所变化。
图3是指纹传感器30中，逻辑演算电路32的方块图。逻辑演算电路32包括加密电路50以及新的一次性码产生电路60。加密电路50包括多个逻辑加密电路，例如包括第一逻辑加密电路52以及第二逻辑加密电路54。然而，加密电路50中多个逻辑加密电路的数目可大于2，并不被图3中的第一逻辑加密电路52以及第二逻辑加密电路54所局限。第一逻辑加密电路52以及第二逻辑加密电路54其中的一个逻辑加密电路可用来对指纹数据进行加密。然而，第一逻辑加密电路52也可以组合第二逻辑加密电路54对指纹数据进行加密。详细的加密方式描述于后文。新的一次性码产生电路60用于产生初始化的一次性码，以及在前次的一次性码被使用后，产生一个新的(更新的)一次性码。逻辑演算电路32可为利用简易的逻辑门制造，换句话说，逻辑演算电路32可省略处理器或是微处理器等计算装置。
图4是指纹传感器30中，嵌入式非挥发性内存34的方块图。嵌入式非挥发性内存34储存了产品识别数据70，用于识别指纹传感器30及其内部模块。嵌入式非挥发性内存34还储存了一次性码72以及加密算法指标74。当一次性码72被视为将指纹数据进行加密的密钥时，加密算法指标74即可用于指定指纹传感器30中，第一逻辑加密电路52以及第二逻辑加密电路54要使用哪一个或是全部的逻辑加密电路对指纹数据进行加密。换句话说，加密算法指标74可指定第一逻辑加密电路52对指纹数据进行加密。加密算法指标74可指定第二逻辑加密电路54对指纹数据进行加密。加密算法指标74也可指定将第一逻辑加密电路52组合第二逻辑加密电路54，再对指纹数据进行加密。特此说明，若加密电路50中多个逻辑加密电路的数目大于2时，指纹数据进行加密所使用的逻辑加密电路将会有更多种组合。
在处理指纹数据的系统20中，由于处理器22将会同步产生一次性码72以及加密算法指标74(等同于被储存在嵌入式非挥发性内存34)的数据，以用于译码指纹数据使用。并且，在处理器22中，也储存与加密电路50以及新的一次性码产生电路60中相同的运算公式。因此，处理器22可对指纹数据进行译码，并产生与新的一次性码产生电路60一致的一次性码。因此，未经授权的用户在不知道一次性码72以及加密算法指标74与加密电路50的情况下，无法取得译码后的指纹数据。在本发明的另一个实施例中，处理器22也可提供一次性码72给指纹传感器30，以取代利用新的一次性码产生电路60产生新的新的一次性码置换掉前次的一次性码72。换句话说，一次性码72可在指纹传感器30的外部端点被接收。一次性码72可为被加密或是未被加密的密码，可储存于嵌入式非挥发性内存34内，或是被处理器22产生。
图5是本发明加密指纹数据的方法的流程图。加密指纹数据的方法的步骤描述于下：
步骤S100：开始；
步骤S102：指纹传感器30的电容阵列38感测指纹，并产生指纹数据；
步骤S104：电容阵列38提供指纹数据至逻辑演算电路32，且嵌入式非挥发性内存34提供一次性码72以及加密算法指标74至逻辑演算电路32；
步骤S106：逻辑演算电路32中的加密电路50根据一次性码72以及加密算法指标74将指纹数据进行加密，其中加密电路50根据加密算法指标74，由第一逻辑加密电路52及第二逻辑加密电路54中选择出至少一个逻辑加密电路。并且，加密电路50根据一次性码72，利用选择出的至少一个逻辑加密电路对指纹数据进行加密；
步骤S108：指纹传感器30将被加密的指纹数据，透过传输路径24传至处理器22；
步骤S110：新的一次性码产生电路60或处理器22产生新的一次性码72，并将新的一次性码72储存于嵌入式非挥发性内存34。更详细地说，一次性码72只能使用一次，因此在一次性码72被指纹数据加密程序使用后，新的一次性码72会被储存于嵌入式非挥发性内存34。若新的一次性码72是使用新的一次性码产生电路60产生，则新的一次性码产生电路60可用随机的方式产生新的一次性码72，或根据一次性码72所对应的前次参数产生。举例而言，若新的一次性码72是根据一次性码72所对应的前次参数产生，实施方式可为，一次性码72所对应的前次参数可以透过简易的逻辑操作转换成新的参数，新的一次性码72即可利用新的参数产生。同时，处理器22也会同步产生新的一次性码72。并且，处理器22产生的新的一次性码72与新的一次性码产生电路60所产生的新的一次性码72是相同的；
步骤S112：结束。
在指纹传感器30中，嵌入式非挥发性内存34所储存的加密算法指标74可以自定时间更新或自动地进行更新。举例而言，加密算法指标74可以周期性地进行更新，例如每天更新或是每周更新。加密算法指标74也可设定在逻辑演算电路32对指纹数据进行加密后进行更新。当加密算法指标74被更新后，更新后的加密算法指标74将会被储存在嵌入式非挥发性内存34。然而，处理器22也可以直接将更新后的加密算法指标74传送至指纹传感器30，并将更新后的加密算法指标74储存在嵌入式非挥发性内存34。
如前文提及，由于处理器22可以产生与指纹传感器30相同的一次性码72以及加密算法指标74，因此处理器22可以透过验证这些包括一次性码72以及加密算法指标74的数据，将加密的指纹数据解密，而进一步验证指纹数据的合法性。加密算法指标74的功能在于指定指纹传感器30中，第一逻辑加密电路52以及第二逻辑加密电路54要使用哪一个或是全部的逻辑加密电路对指纹数据进行加密。并且，处理器22内不需要设置任何逻辑加密电路(例如第一逻辑加密电路52以及第二逻辑加密电路54)，原因为处理器22可为一般具有强大运算能力的中央处理器或是运算单元，因此可利用程序指令或是软件控制让处理器22同步产生一次性码72以及加密算法指标74。换句话说，处理器22具有第一逻辑加密电路52以及第二逻辑加密电路54所有的逻辑操作能力，可将加密后的指纹数据进行反向操作，例如将加密后的指纹数据进行解密。
综上所述，本发明提供了一种动态加密式指纹传感器以及利用一次码动态地加密指纹数据的方法。由于一次码的使用效力只限于单次使用，因此未经授权的用户将指纹数据译码会有很高的困难度。并且，由于第一逻辑加密电路以及第二逻辑加密电路会被动态地选择执行指纹数据的加密程序，因此等同于提供了更进一步的安全性保护。换句话说，除非同时知道一次性码以及被选择的加密电路集合的用户，才有机会将对应的指纹数据进行译码。此外，指纹传感器可使用单芯片制造，在应用层面上可使指纹传感器的动态加密功能直接应用于各种不同的电子商品。换句话说，电子商品结合指纹传感器后，将可获得更高的传输安全性以及更高的隐私保障。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (19)

1.一种动态加密式指纹传感器，其特征在于，包括：
电容阵列，用于感测指纹，并产生指纹数据；
嵌入式非挥发性内存，用于储存一次性码及加密算法指标；
逻辑演算电路，用于根据所述一次性码及所述加密算法指标将所述电容阵列产生的所述指纹数据进行加密，所述逻辑演算电路包括加密电路，所述加密电路包括多个逻辑加密电路，所述加密电路根据所述加密算法指标，由所述多个逻辑加密电路中选择出至少一个逻辑加密电路，所述加密电路根据所述一次性码，利用所述至少一个逻辑加密电路将所述指纹数据加密；及
控制电路，耦接于所述电容阵列、所述嵌入式非挥发性内存及所述逻辑演算电路，用于控制所述电容阵列、所述嵌入式非挥发性内存及所述逻辑演算电路。
2.如权利要求1所述的动态加密式指纹传感器，其特征在于，所述加密算法指标周期性地进行更新，及所述嵌入式非挥发性内存用于储存更新后的加密算法指标。
3.如权利要求1所述的动态加密式指纹传感器，其特征在于，所述加密算法指标在所述逻辑演算电路对所述指纹数据进行加密后进行更新，及所述嵌入式非挥发性内存用于储存更新后的加密算法指标。
4.如权利要求1所述的动态加密式指纹传感器，其特征在于，所述一次性码是被加密的密码。
5.如权利要求1所述的动态加密式指纹传感器，其特征在于，所述一次性码是在所述动态加密式指纹传感器的外部端点被接收。
6.如权利要求1所述的动态加密式指纹传感器，其特征在于，所述逻辑演算电路还包括新的一次性码产生电路，所述新的一次性码产生电路于所述一次性码被使用后，产生新的一次性码。
7.如权利要求6所述的动态加密式指纹传感器，其特征在于，所述新的一次性码会以随机的方式产生，或根据所述一次性码所对应的前次参数产生。
8.如权利要求1所述的动态加密式指纹传感器，其特征在于，所述动态加密式指纹传感器使用单芯片制造。
9.如权利要求1所述的动态加密式指纹传感器，其特征在于，所述嵌入式非挥发性内存储存所述动态加密式指纹传感器的产品识别数据，用于识别所述动态加密式指纹传感器。
10.一种指纹数据的动态加密方法，其特征在于，包括：
指纹传感器的电容阵列感测指纹，并产生所述指纹数据；
接收加密算法指标及一次性码；
根据所述加密算法指标，由多个逻辑加密电路中选择出至少一个逻辑加密电路；及
根据所述一次性码，将所述电容阵列所产生的所述指纹数据利用所述至少一个逻辑加密电路进行加密。
11.如权利要求10所述的动态加密方法，其特征在于，所述一次性码及所述加密算法指标储存于所述指纹传感器的嵌入式非挥发性内存。
12.如权利要求11所述的动态加密方法，其特征在于，所述加密算法指标周期性地进行更新，及所述嵌入式非挥发性内存储存更新后的加密算法指标。
13.如权利要求11所述的动态加密方法，其特征在于，所述加密算法指标在逻辑演算电路对所述指纹数据进行加密后进行更新，及所述嵌入式非挥发性内存储存更新后的加密算法指标。
14.如权利要求11所述的动态加密方法，其特征在于，所述嵌入式非挥发性内存储存所述指纹传感器的产品识别数据，用于识别所述指纹传感器。
15.如权利要求10所述的动态加密方法，其特征在于，所述一次性码是被加密的密码。
16.如权利要求10所述的动态加密方法，其特征在于，所述一次性码是在所述指纹传感器的外部端点被接收。
17.如权利要求10所述的动态加密方法，其特征在于，还包括：
在所述一次性码被使用于加密所述指纹数据后，产生新的一次性码。
18.如权利要求17所述的动态加密方法，其特征在于，所述新的一次性码会以随机的方式产生，或根据所述一次性码所对应的前次参数产生。
19.如权利要求10所述的动态加密方法，其特征在于，所述指纹传感器使用单芯片制造。
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