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Asymmetric encryption: changing my private key


Asymmetric encryption: changing my private key

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Asymmetric encryption: changing my private key
Tag : encryption , By : user121501
Date : November 28 2020, 08:01 AM


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Java asymmetric encryption: preferred way to store public/private keys


Tag : java , By : Epora75
Date : March 29 2020, 07:55 AM
will help you In our applications, we store public and private keys in DER format so they can be used and manipulated outside java more easily. In our case, the private keys do not have passwords on them.
To convert the private key to something more easily usable in java:
openssl pkcs8 -topk8 -nocrypt -in key.pem -inform PEM -out key.der -outform DER
public static RSAPrivateKey getPrivateKey(File privateKeyFile) throws IOException, GeneralSecurityException {
    byte[] keyBytes = new byte[(int)privateKeyFile.length()];
    FileInputStream fis = new FileInputStream(privateKeyFile);
    fis.read(keyBytes);
    PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(keyBytes);
    KeyFactory keyFactory = KeyFactory.getInstance("RSA");
    RSAPrivateKey privKey = (RSAPrivateKey) keyFactory.generatePrivate(spec);
    return privKey;
}
openssl rsa -in private.pem -pubout -outform DER -out public.der
public static RSAPublicKey getPublicKey(File publicKeyFile) throws IOException, GeneralSecurityException {
    byte[] keyBytes = new byte[(int)publicKeyFile.length()];
    FileInputStream fis = new FileInputStream(publicKeyFile);
    fis.read(keyBytes);
    X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(keyBytes);
    KeyFactory factory = KeyFactory.getInstance("RSA");
    RSAPublicKey pubKey = (RSAPublicKey)factory.generatePublic(publicKeySpec);
    return pubKey;
}

Can I use asymmetric encryption with two private keys?


Tag : encryption , By : firebasket
Date : March 29 2020, 07:55 AM
will help you You have your private key in the safe, and publish your public key. When you create a license you encrypt it with your private key. The client can only decrypt it with your public key.
If you want to restrict your license to a client, ask the client to generate their keypair, and send their public key to you. You then encrypt the license with their public key, then sign it (or encrypt it again) with your private key.

Two private key asymmetric encryption - possible?


Tag : encryption , By : esimran
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Asymmetric keys are never used for encrypting messages (too slow, has a size limit, etc.), only for encrypting small buffers, like symmetric keys for messages.
When you encrypt a message with an asymm. key, you are in fact encrypting a symmetric key which encrypts the message.

How should I secure the Private Key when using Asymmetric RSA encryption?


Tag : chash , By : RichAA
Date : March 29 2020, 07:55 AM
I wish this helpful for you You can use Windows RSA Key containers to store the key. The key can be installed / created by the aspnet_regiis.exe tool that ships with the .NET framework.
Here is a walkthrough.

Asymmetric public / private key encryption RSA with nodeJS and Objective-C


Tag : objective-c , By : obijywk
Date : March 29 2020, 07:55 AM
Hope that helps to Curious Programmer I found the answer from this link:
node-rsa errors when trying to decrypt message with private key
    myDecrypter.setOptions({encryptionScheme: 'pkcs1'});
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