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  • Encryption

    2020-11-20 22:31:34
    <div><p>Could you please explain the encryption process? Where are encryption (private) keys stored? <p>Thanks!</p><p>该提问来源于开源项目:nuxsmin/sysPass</p></div>
  • encryption-源码

    2021-03-26 06:24:05
    encryption
  • Encryption-源码

    2021-03-19 23:52:15
    Encryption
  • Contributory Broadcast Encryption with Efficient Encryption and Short Ciphertexts
  • Encryption加密

    2018-12-23 21:03:35
    Laravel官方文档讲解,该资料是一整套视频,需要逐个下载,Encryption加密
  • Generic Construction of Certificate Based Encryption from Certificateless Encryption Revisited
  • Database encryption

    2020-12-26 02:05:27
    <div><p>Hi, the set of patches in this pull request implement database encryption for the glass and chert backends. I've used the Botan library as a provider of crypto routines but there's no ...
  • EIGamal encryption和Pairing encryption均具有乘法同态性。 1. EIGamal encryption 2. Pairing encryption 参考资料: [1] ppt Efficient Zero-Knowledge Argument for Correctness of a Shuffle [2] [3] [4] ...

    1. EIGamal encryption

    ElGamal is a scheme, that can be applied to any kind of group structure. The only requirement is that DDH has to be hard (e.g. not (Zp,+)(\mathbb{Z}_p,+)).

    • 若基于multiplicative groups (Zp,)(\mathbb{Z}_p^*,\cdot)来实现EIGamal encryption,则需要larger groups, due to attacks like index calculus。【Index Calculus攻击是一种企图解决DLP(离散对数问题)的方法。简单来说,算法把目标值写成在因子基数上的元素幂的乘积,对数已知的元素,然后利用对数定律提取目标值。】
    • 若使用elliptic curves来实现EIGamal encryption,则可以使用smaller groups,因为在elliptic curves不存在index calculus攻击问题。【但是Elliptic curves with pairings are not suitable to be used, because in that case the DDH problem is not hard. Therefore, you can not design protocols with efficiently computable pairings.】

    One property of ElGamal is, that it is (semi-)homomorphic w.r.t. the group operation. If you see that as an unwelcome property, you can also call that malleable. If you consider this property useful or a security risk, depends on your point of view and your actual goal.


    1.1 基于multiplicative groups (Zp,)(\mathbb{Z}_p^*,\cdot)的EIGamal encryption实现

    根据ppt Efficient Zero-Knowledge Argument for Correctness of a Shuffle 有:
    在这里插入图片描述
    根据上图公式可知,基于multiplicative groups (Zp,)(\mathbb{Z}_p^*,\cdot)的EIGamal encryption实现具有乘法同态性。

    1.2 基于ECC的EIGamal encryption实现

    基于ECC的EIGamal encryption实现为:
    在这里插入图片描述

    相比于1.1的实现,多增加了第一步映射和最后一步逆运算内容:

    • 基于公共已知的函数ff先将待加密的消息mm映射成elliptic curve EE上的一个point PmP_m
    • 基于PmP_m进行加密成相应的密文(C,D)(C,D)
    • 从密文(C,D)(C,D)中可解密出相应的PmP_m
    • 基于ff进行逆运算f1(Pm)f^{-1}(P_m)获得原始的消息mm

    其中用于消息映射的公共已知函数ff应可逆,ff函数的选择可有:

    • 参照Neal Koblitz 1987年论文 《Elliptic Curve Cryptosystems》,其有一种实现方式为将m映射为曲线方程式中的xx坐标,相应的yy坐标可根据曲线方程式直接计算。【这种方式构建的EIGamal encryption不具有同态性。(Projecting the point to the x coordinate does not give you a homomorphism.)】
      在这里插入图片描述
    • 借助1.1EIGamal标准实现中的exponential思路,将消息mm映射a point MM on the curve (using an injective efficiently invertible encoding),M=mPM=m\cdot P,其中PP为generator, mm为an integer in the order of the group。【基于这种思路构建的EIGamal encryption具有加法同态性。】
      在这里插入图片描述

    2. Pairing encryption

    可参见博客 加法/乘法同态加密算法及在zk-SNARK中的应用An Introduction to Pairing-Based Cryptography学习笔记

    pairing具有乘法同态性。
    若从

    参考资料:
    [1] ppt Efficient Zero-Knowledge Argument for Correctness of a Shuffle
    [2] https://crypto.stackexchange.com/questions/14437/elgamal-with-elliptic-curves-i
    [3] https://crypto.stackexchange.com/questions/9987/elgamal-with-elliptic-curves/9990#9990
    [4] https://www.ams.org/journals/mcom/1987-48-177/S0025-5718-1987-0866109-5/
    [5] 博客 第三十六个知识点:Index Calculus算法
    [6] Neal Koblitz 1987年论文 《Elliptic Curve Cryptosystems

    展开全文
  • wrong encryption

    2021-01-08 05:41:15
    <div><p>Why is not the encryption overtaken? If I connect to not protected network, than the selected default encryption is "WPA2-PSK" and not "No Encryption".</p><p>该提问来源于开源...
  • EBS Encryption

    2020-12-09 02:51:02
    <div><p>One requirement for using Public Cloud is encryption of at rest systems. So being able to enable encryption of EBS volumes would be required feature. Even better would be ability to use your ...
  • broadcase encryption scheme

    2020-10-20 20:03:48
    encryption for lightweigth device
  • LE Encryption

    2020-12-08 19:49:28
    <div><p>How can I check if a characteristic require encryption and where does noble handle this automatic encryption process ? </p><p>该提问来源于开源项目:abandonware/noble</p></div>
  • Binlog encryption

    2020-11-21 19:52:31
    <pre><code>MDEV-8264 encryption for binlog * Start_encryption_log_event * --encrypt-binlog command line option based on google patches. </code></pre> <p>commit 7bd2f20e880a5871635260c0a96448631c28...
  • Message encryption

    2021-01-02 03:13:05
    <div><p>This builds on #129 by adding encryption based on https://tools.ietf.org/html/draft-thomson-webpush-encryption. At the moment, this is just a strawman for discussion.</p><p>该提问来源于开源...
  • Transfer encryption

    2020-11-27 17:51:27
    How i understand - we can easy turn it on (because lib torrent support encryption) - Maybe government can spy that data <p>2) - It is very hard to make own encryption system - it would be very hard ...
  • Add encryption

    2020-11-27 11:17:30
    <div><p>I was looking for a notepad with encryption feature and ran into <a href="http://www.andromeda.com/people/ddyer/notepad/NotepadCrypt-technotes.html">NotepadCrypt</a>. It's based on Notepad...
  • Encryption support

    2020-12-30 09:17:45
    <div><p>We need to add support for encryption of RTP, RTCP, and RTSP traffic. For that purpose, we likely want to use SRTP, SRTCP, and encrypted RTSP. <p>We need to choose protocols and a library for ...
  • Encryption V2

    2021-01-06 06:18:10
    I improved on my previous encryption efforts with better testing as well as a separate mode of encryption in which we can just encrypt the whole payload at once and also added a decrypt call just for...
  • no encryption

    2020-12-08 19:06:58
    after downloading and detecting ads it skips from encryption phase and jumps back to downloading again. When I tried "Always use Tivo's TS format" in v2.5 , encryption started and finished...
  • Encryption examples

    2020-12-06 22:42:37
    <p>Adds two commits with examples for encrypting, decrypting, and updating the encryption key on blobs. <p>Also adds two methods to <code>Storage.java</code> for being able to set the target of a copy...

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