这个应用程序验证信用卡号码，也加密和解密消息。
1. CARDit:
Checks the validity of a Credit Card number. Helps you verify whether the sixteen (16) digits number of a credit card that a friend sent to you is valid or not.
2. LOCKit:
Creates a security measure for messages that are been transmitted through Mails and SMS. You use it to encrypt(lock) the content of a message with a password before sending it through mail or sms, so that only the person who has the password can decrypt(unlock) it and thereby preventing any unauthorized access or third party from reading the content of your message.