The digital signature encryption and decryption process

The private key encryption and decryption process that uses public key system, but the process to achieve just the opposite, use of different keys. The use of digital signatures is the sender's key right, to send in their own private key encryption, the sender with the recipient's public key to decrypt. This is a one-to-many relationship: have any sender's public key can verify the validity of digital signatures, while the private key encryption is used to decrypt the receiver is the key, which is many-to-one Relationship: know that any recipient's public key can send encrypted to the recipient, only to receive only one side of the private key can decrypt the information. In practical, usually a user has two keys right, one of the key used to decrypt encrypted digital signature, a key used to encrypt private key to decrypt. This approach provides higher security.