如何發送密碼保護SMS /文本信息

Question

我可以在我的Android應用程序通過這個代碼

SmsManager sm = SmsManager.getDefault(); 
sm.sendTextMessage(edt_phoneNo, null, message, null, null); 

發送短信，但我可以發送一個密碼保護的短信？有Android的接口從用戶獲取密碼打開我的短信？

Answer 1

您可以通過多種方式加密消息文本。例如像在this答案

DESKeySpec keySpec = new DESKeySpec("Your secret Key phrase".getBytes("UTF8")); 
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); 
SecretKey key = keyFactory.generateSecret(keySpec); 
sun.misc.BASE64Encoder base64encoder = new BASE64Encoder(); 
sun.misc.BASE64Decoder base64decoder = new BASE64Decoder(); 
......... 

// ENCODE plainTextPassword String 
byte[] cleartext = plainTextPassword.getBytes("UTF8");  

Cipher cipher = Cipher.getInstance("DES"); // cipher is not thread safe 
cipher.init(Cipher.ENCRYPT_MODE, key); 
String encryptedPwd = base64encoder.encode(cipher.doFinal(cleartext)); 
// now you can store it 
...... 

// DECODE encryptedPwd String 
byte[] encrypedPwdBytes = base64decoder.decodeBuffer(encryptedPwd); 

Cipher cipher = Cipher.getInstance("DES");// cipher is not thread safe 
cipher.init(Cipher.DECRYPT_MODE, key); 
byte[] plainTextPwdBytes = (cipher.doFinal(encrypedPwdBytes));