SecureRandom = new SecureRandom(byte[] seed) byte[] seed 任意 KeyPairGenerator = KeyPairGenerator.getInstance(String algorithm) String algorithm 標準名のドキュメント Cipher (暗号化) アルゴリズム KeyPairGenerator.initialize(int keysize, SecureRandom random) int keysize 任意 KeyPair = KeyPairGenerator.generateKeyPair() PrivateKey = KeyPair.getPrivate() PublicKey = KeyPair.getPublic() Cipher = Cipher.getInstance(String tra