包括两个部分：数字签名和签名认证。密钥采用des加密。通过md5获取数字摘要。然后用rsa签名/认证。-Consists of two parts: digital signature and signature authentication. Key using des encryption. Through the md5 access to digital paper. Then use the rsa signature/certification.

matlab实现RSA对图像进行加密（自己手动生成公钥，私钥，按照像素进行加解密）-matlab to achieve the image RSA encryption (to manually generate a public key, private key, according to the pixel encryption and decryption)