RSA (Rivest–Shamir–Adleman) is one of the first public-key cryptosystems and is widely used for secure data transmission. In such a cryptosystem, the encryption key is public and distinct from the decryption key which is kept secret (private). Jun 15, 2015  Hi guys, I've been wracking my brain for weeks on RSA encryption and it turns out the key I had isn't the key at all, its an exponent and I need to use the exponent and modulus I have to generate a key, however it doesn't seem (from what I've found) that Apple has a way of doing that in iOS.

1. Generate Rsa Public Key From Modulus Exponent
2. Generate Rsa Public Key From Modulus Exponent Java 10
3. Generate Rsa Public Key From Modulus Exponent Java Calculator

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There's a scenario, when your Android app connect to your server, there're some secret keys like authentication key, the keys for encrypting the data you send to the server and the keys for decrypting you get from the server... etc. You don't want users to reverse engineering your apk and find those keys easily, we've got two ways to hide your secret keys.

Generate Rsa Public Key From Modulus Exponent

Using this program to encrypt your secret keys, you post those encrypted strings to your android project. Then, fill in the parameters generated by this program in your project for decryption to decrypt the messages.

• Generate encrypted messages.
• Generate a pair of RSA modulus and exponent for decryption.

Step1. Fill in your secret keys

Step2. Run Main.java

You'd get logs in your consult like that:

Generate Rsa Public Key From Modulus Exponent Java 10

Step3. Add the decryption method to your project

1. Create Algorithm class and paste the following codes

2. Add the decryption method to your project, see android sample project here SecuritySample

Generate Rsa Public Key From Modulus Exponent Java Calculator

When you add new secret keys, you must refill modulus, exponent and the other encrypted keys, because you get different RSA KeyPair(private key and public key) every execution.