Introduction - If you have any usage issues, please Google them yourself
Achieve a document file encryption and signature tool 1. Select a hash algorithm (MD5 | SHA1 | SHA3) for summary calculations 2, choose a symmetric key encryption algorithms or stream ciphers (DES | AES | RC4) 3. Select a public key signature algorithm (RSA | ECC), requires a separate key pair generation algorithm encryption mode 4, document file for CBC.