CrypTon offers you Public key cryptography, or asymmetric cryptography. Send encrypted messages by E-mail, iMessage, Viber, WhatsApp, Telegram, ICQ or any other messenger, send encrypted file attachments by e-mail or share encrypted confidential photos and videos using DropBox or other cloud services and be sure that they can be opened only by the person, whose key you used. Some features require monthly or annual PREMIUM PLUS subscription with 1 week free trial.