diffie-hellman | 易学教程

Diffie-Hellman Key Exchange with Javascript sometimes wrong

阅读更多关于 Diffie-Hellman Key Exchange with Javascript sometimes wrong

问题 After watching this video http://youtu.be/3QnD2c4Xovk I've been trying to follow it step by step, and haven't been able to produce the same results. Notably, when I try to do Math.pow(3, 54)%17, I get 7. While the speaker gets 15. I wrote a method that is supposed to simulate Diffie Hellman's key exchange using exactly what I found on http://en.wikipedia.org/wiki/Diffie%E2%80%93Hellman_key_exchange This is my code: function diffieHellman(generator, prime, alice_secret, bob_secret){ var alice

Why does Curve25519 calculate key pair correctly even though its parameters are wrong?

阅读更多关于 Why does Curve25519 calculate key pair correctly even though its parameters are wrong?

问题 It seems that .NET (Core 3.1) supports custom curves in ECC. So I've defined the Curve25519, and generated key pair by below code: using System; using System.Security.Cryptography; namespace Curve25519 { class Program { static void Main(string[] args) { ECCurve ecCurve = new ECCurve() // Curve25519, 32 bytes, 256 bit { CurveType = ECCurve.ECCurveType.PrimeMontgomery, B = new byte[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }, A = new byte

How to use crypto-browserify's diffie hellman properties

阅读更多关于 How to use crypto-browserify's diffie hellman properties

来源： https://stackoverflow.com/questions/63500683/how-to-use-crypto-browserifys-diffie-hellman-properties

How to use crypto-browserify's diffie hellman properties

阅读更多关于 How to use crypto-browserify's diffie hellman properties

来源： https://stackoverflow.com/questions/63500683/how-to-use-crypto-browserifys-diffie-hellman-properties

Can someone tell me how to make a server choose a ECDH_* cipher over ECDHE_*?

阅读更多关于 Can someone tell me how to make a server choose a ECDH_* cipher over ECDHE_*?

问题 I am using RSA cipher for signing the certificate and SSL_CTX_set_tmp_ecdh_callback () api to set the ECDH parameters for key-exchange. The server always ends up choosing TLS_ECDHE_RSA_* cipher suite. If i make the client send only TLS_ECDH_* cipher suites in the clientHello, the server breaks the connection stating "no shared cipher". Can someone tell me how to make a server choose a ECDH_* cipher over ECDHE_* ? How is it that the server decides I should choose ECDH_* cipher over ECDHE_*

Can someone tell me how to make a server choose a ECDH_* cipher over ECDHE_*?

阅读更多关于 Can someone tell me how to make a server choose a ECDH_* cipher over ECDHE_*?

iOS Swift Diffie-Hellman key exchange to encrypt and decrypt messages? using Secure Enclave

阅读更多关于 iOS Swift Diffie-Hellman key exchange to encrypt and decrypt messages? using Secure Enclave

问题 How can i use the Diffie-Hellman key exchange to encrypt and decrypt messages? I'am able to generate the shared keys (for both bob and alice) but SecKeyCopyKeyExchangeResult returns me a Data...how can i get SecKey to use with SecKeyCreateDecryptedData and SecKeyCreateEncryptedData ? So i think i should extract the SecKey somehow from the shared data so i can make symettrical encryption/decryption. The code so far is: let bob_shared_secret: NSData = generateSharedKey_ecdh(publicKey:

iOS Swift Diffie-Hellman key exchange to encrypt and decrypt messages? using Secure Enclave

阅读更多关于 iOS Swift Diffie-Hellman key exchange to encrypt and decrypt messages? using Secure Enclave

Node.js crypto key creation using Java

阅读更多关于 Node.js crypto key creation using Java

问题 I have this code in node.js, it create Key using Crypto. Can i create same key using Java? diffieHellmanConfig': { 'group': 'modp14', 'encoding': 'base64' } const clientDHInstance = crypto.getDiffieHellman(config.userCardCrypto.diffieHellmanConfig.group); clientDHInstance.generateKeys(); const clientPublicKey = clientDHInstance.getPublicKey(config.userCardCrypto.diffieHellmanConfig.encoding); I try to use KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DH"); keyGen

IPsec入门篇讲解（第二篇）

阅读更多关于 IPsec入门篇讲解（第二篇）

安全联盟（SA）  IPSec通过在IPSec对等体间建立双向安全联盟（SA），形成一个安全互通的IPSec隧道，来实现Internet上数据的安全传输  SA由一个三元组来唯一标识，这个三元组包括安全参数索引SPI（Security Parameter Index）、目的IP地址和使用的安全协议号（AH或ESP）。其中，SPI是为唯一标识SA而生成的一个32位比特的数值，它在AH和ESP头中传输。在手工配置SA时，需要手工指定SPI的取值。使用IKE协商产生SA时，SPI将随机生成  SA是单向的逻辑连接，因此两个IPSec对等体之间的双向通信，最少需要建立两个SA来分别对两个方向的数据流进行安全保护。如图1所示，为了在对等体A和对等体B之间建立IPSec隧道，需要建立两个安全联盟，其中，SA1规定了从对等体A发送到对等体B的数据采取的保护方式，SA2规定了从对等体B发送到对等体A的数据采取的保护方式  另外，SA的个数还与安全协议相关。如果只使用AH或ESP来保护两个对等体之间的流量，则对等体之间就有两个SA，每个方向上一个。如果对等体同时使用了AH和ESP，那么对等体之间就需要四个SA，每个方向上两个，分别对应AH和ESP  有两种方式建立IPSec安全联盟：手工方式和IKE自动协商方式。二者的主要区别为  密钥生成方式不同  手工方式下，建立SA所需的全部参数