cryptography

问题 Ahoy there! My first posting, be gentle! Windows 7 SrvPck 1, node v0.12.3, npm 2.9.1, aes256 cipher This is throwing me... it's also throwing a very basic error when I retrieve sample data from a client using TCP. My test configuration is on Windows 7 SrvPck 1 with node v0.12.3 and npm 2.9.1. My client/server are on the same Windows machine with port 5000 as the server. This inquiry is based on this posting which I found very informative - I'm new to node.js and crypto! Unfortunately I've

问题 I am working on a Spring-MVC application which uses Hibernate as the ORM and PostgreSQL as the database, in which I am looking for on-the-fly encryption decryption solution, but only for 2 columns in the database, the rest all can stay non-encrypted. I have a Person entity, which has a password and I am encrypting the password with BCrypt and saving them in database. If possible, I would like to use this password to encrypt/decrypt those 2 columns once the user logs in and does action on

问题 I have this code working fine. I am signing with an USB eToken. But after copying and pasting the PEM output of this code in the https://lapo.it/asn1js/ the trust chain is not shown. This eToken was provided by a CA and thus it has a trust chain of the signature. What's wrong? lib = pkcs11.lib('/usr/lib/libeToken.so.9') for slot in lib.get_slots(): try: token = slot.get_token() with token.open(user_pin='****') as session: priv = session.get_key(object_class=pkcs11.constants.ObjectClass

问题 I would like to limit the length of the encrypted output code like 8 or 10 or 12 character etc. I have created the very small encrypted coed using he "Advanced Encryption Standard (AES)" with Cryptography.SymmetricAlgorithm.IV. But the result of the Encrypted code as example below: Input Password = "090400551" Converted Output = "mkopj3WFb6RZMp34urFLew==" // This should be half the length I want to reduce the length of 8 to 12 character. Any C# cryptography library or algorithm would be fine

问题 I need to encrypt and sign data using PKCS7(CMS) . I am using bouncy castle provided api to achieve this using java . Till now what i understood is i need to follow these steps Need to generate a key pair private & public key using some algorithm say RSA Certify it with X509 certificate Convert it into PKCS7 key format like p7b Generate java key store using keytool some *.jks file Generate the Certificate Signing Request (CSR) using keytool command *.crt Become self CA(Certificate Autority)

问题 I want to get ECDH keypair (Public key and Private key). This method is not working in Android 9.0 pie, because Security provider "BC" , "SC" is removed from this version. I tried below method KeyPairGenerator keyGen = KeyPairGenerator.getInstance("EC", "BC"); SecureRandom random = SecureRandom.getInstance("SHA1PRNG"); keyGen.initialize(256, random); KeyFactory kaif = KeyFactory.getInstance("EC", "BC"); KeyPair pair = keyGen.generateKeyPair(); PrivateKey privateKey = pair.getPrivate();

问题 How to correctly install Libsodium with PHP verson 5.5. I'm trying to follow the instruction on https://paragonie.com/book/pecl-libsodium/read/00-intro.md#installing-libsodium Here are the steps I did: Go to http://windows.php.net/downloads/pecl/releases/libsodium/1.0.6/ Download "php_libsodium-1.0.6-5.5-nts-vc11-x64.zip" and extract files. Copy "libsodium.dll" in my directory "C:\Program Files (x86)\PHP\v5.5" where is "php.exe" Copy "php_libsodium.dll" in my directory "C:\Program Files (x86)

问题 Summary: I am attempting to decrypt (and eventually encrypt and return) files that are AES128 encrypted. The AES key is encrypted using libcrypt's RSA provider. When I attempt to decrypt the AESKey on Windows 7 using C# & BouncyCastle a "block truncated" error is thrown when I call "ProcessBlock". I have tried converting the data to BigEndian and I'll get a "Not a valid RSA exponent" when I try to create the RsaKeyParameters. The encryption was done using libgcrypt 1.2x on a linux system. I

问题 I have an RSA key pair that I generated in Java and I need to programmatically write the private key to the same format that openssl does when I run this command (and enter the appropriate data for the prompts, namely a passphrase to protect the private key): openssl req -out request.csr -newkey rsa:2048 -keyout privkeyfile The Java code to generate the key pair is pretty standard: KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA"); keyGen.initialize(2048); KeyPair keyPair = keyGen

问题 When I implemented a license key mechanism in C# using RSA, I came across the RSACryptoServiceProvider class, which is limited to a minimum of 384 bit key size. This key length has direct impact on the signature (==license key) which I created. Is 384 bits a technical limit of RSA in general or might it be possible to implement RSA successfully with even shorter key sizes? Reading the (German) Wikipedia article which explains RSA, they use very small prime numbers in their mathematics