cryptography

问题 I am wanting generate a keypair once and reuse it. public static KeyPair generateKeyPair() throws Exception { KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA"); generator.initialize(2048, new SecureRandom()); KeyPair pair = generator.generateKeyPair(); return pair; } How do I go about this? 回答1: There is a bit of a problem here: Java's focus is almost entirely on TLS and the cryptography required to implement TLS. For TLS a private key and a certificate is required. So you get

问题 I wanna set up scrapy cluster follow this link scrapy-cluster,Everything is ok before I run this command: pip install -r requirements.txt The requirements.txt looks like: cffi==1.2.1 characteristic==14.3.0 ConcurrentLogHandler>=0.9.1 cryptography==0.9.1 ... I guess the above command means to install packages in requirements.txt.But I don't want it to specify the version,So I change it to this: cat requirements.txt | while read line; do pip install ${line%%[>=]*} --user;done When install

问题 New to JS, I'm also learning to use crypto libraries. I don't understand why signing/encoding the same message with the same secret yields differing results. I'm using jsSHA 1.3.1 found here, and CryptoJS 3.0.2 described here trying to create a base64 sha-1 encoded hmac signature. Here's the code: In html... <script src="lib/jsSHA/src/sha1.js"></script> <script src="http://crypto-js.googlecode.com/svn/tags/3.0.2/build/rollups/hmac-sha1.js"></script> And in js... var message = "shah me"; var

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 3 years ago . can you recommend an open source Delphi crypto library that works with Delphi 2006, Delphi 2009 & Delphi 2010 Algorithms need : DES, MD5, SHA-1 回答1: Here is a short list of the libraries I have used both pre and post D2009: TPLockbox (I use an unofficial updated version. Although there is a recent official(?)

问题 Is the security of the HMAC based on SHA-1 affected by the collisions attacks on SHA-1? 回答1: The security implications of HMAC are described in detail in the security section of the RFC. In a nutshell, a very strong attack indeed is required before the security of the HMAC is threatened; the existing collision attacks on SHA-1 certainly don't constitute such. HMAC is specifically designed to make attacks difficult, and ordinary collision attacks won't generally suffice: The security of the

问题 I am attempting to run my app in an emulator and have been receiving the following error: Installation failed since the APK was either not signed, or signed incorrectly. If this is a Gradle-based project, then make sure the signing configuration is specified in the Gradle build script. I am attempting to run the app with a debug setting so signing the app should not be necessary as it will be given a temporary signature upon building. 回答1: This happens often when you install the same app

问题 I'm using AES to encrypt/decrypt some files in GCM mode using BouncyCastle. While I'm proving wrong key for decryption there is no exception. How should I check that the key is incorrect? my code is this: SecretKeySpec incorrectKey = new SecretKeySpec(keyBytes, "AES"); IvParameterSpec ivSpec = new IvParameterSpec(ivBytes); Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding", "BC"); byte[] block = new byte[1048576]; int i; cipher.init(Cipher.DECRYPT_MODE, incorrectKey, ivSpec);

问题 Question says it all, what is the best method of generating a random salt (to be used with a hash function) in C#? 回答1: You should use the RNGCryptoServiceProvider class to generate cryptographically secure random numbers.. 回答2: Enterprise Library should be able to create a random salt for you very effectively. Check it out here. 来源： https://stackoverflow.com/questions/6415724/best-way-to-generate-random-salt-in-c

问题 I am doing a simple program to encrypt/decrypt using RSA algorithm in Java. I create a cipher object as follows: //Create a Cipher object Cipher rsaCipher = Cipher.getInstance("RSA/ECB/NoPadding"); I do the encryption by calling the encrypt function: String cipher=encrypt(textByte, pair, rsaCipher); System.out.println("The Encryption using RSA Algorithm : "+cipher); And the decryption as: //Decryption String plain=decrypt(Base64.decodeBase64(cipher),pair, rsaCipher); System.out.println("The

问题 If I invoke the command from Mac echo hello | shasum -a 256 or from ubuntu echo hello | sha256sum Then I get the following result 5891b5b522d5df086d0ff0b110fbd9d21bb4fc7163af34d08286a2e846f6be03 - I notice there is dash at the end. But when I use Python hashlib or Java java.security.MessageDigest , they give me the same result as follows: 2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824 So, could anyone point out where I got it wrong please? Thanks. Python: >>> import hashlib