![]() ![]() PRIVATE_KEY = new String(Base64.encode(privateKeyBytes, Base64. Save the public key so it is not generated each and every timeīyte privateKeyBytes = privateKey.getEncoded() PUB_KEY = new String(Base64.encode(publicKeyBytes, Base64.DEFAULT)) *private final static int CRYPTO_BITS = 4096 This will encrypt in 4093bits, note however that is slower.*/īyte publicKeyBytes = publicKey.getEncoded() Private static String PRIVATE_KEY = "privateKey" Private static String PUB_KEY = "pubKey" Private final static int CRYPTO_BITS = 2048 Private final static String CYPHER = "RSA/ECB/OAEPWITHSHA-256ANDMGF1PADDING" Private final static String CRYPTO_METHOD = "RSA" Naturally, since you cant deduce the private key from the public, you cant deduce the public key from the private either. Of course, we choose one specially to be private and reveal the other - but theoretically they do the same thing. To demo this i have created a empty android App and you can follow the guide and examine the code below. RSA is symmetric in d and e: you can equally-well interchange the roles of the public and the private keys. This will allow you to generate and public and private key that can be used to encrypt and decrypt your data. Using 2048-bit RSA with SHA-256 is a secure signing scheme for a certificate. ![]() SHA-256 is a perfectly good secure hashing algorithm and quite suitable for use on certificates while 2048-bit RSA is a good signing algorithm (do note that signing is not the same as encrypting). Since SHA-1 and RSA-1024 is outdated and has shown low security, SHA-256 and RSA 2048 is the current standard. ![]()
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