1, digital signature and authentication function: digital envelope technology can use private key to sign data to ensure the integrity and authenticity of data. The public key is used to verify the signature, realize the identity authentication of the communication party and prevent the data from being tampered with or fraudulently used.
2. Convenient key management: In digital envelope technology, only RSA's private key needs to be kept well, and there is no need to manage and exchange DES keys. This simplifies the complexity of key management and reduces the risk and cost of key management.
3. Reduce the risk of DES key leakage: In digital envelope technology, both communication parties carry DES keys encrypted with RSA public key in the transmitted ciphertext. In this way, the two parties do not exchange DES keys by other means, which reduces the risk of DES key leakage during transmission and improves the security of communication.