But the safe transmission scheme based on information hiding technique is different, which embeds email into public image and hides the existence of email.

• 而基于信息隐藏技术的电子邮件安全传输方案，利用数字图像为载体，把邮件信息隐藏到图像中，隐藏信息本身的存在性来达到安全传输的目的。