Abstract:
There are provided a method and device for providing a security assistant service. In an embodiment of the invention, there is provided a device for providing a security assistant service in which a first terminal and a second terminal are included. The device includes the first terminal configured to generate information for requesting verification of an original plaintext to be signed (here, the information for requesting verification of the original plaintext to be signed refers to the original plaintext to be signed or a hash value of the original plaintext to be signed) and transmit an encrypted value in which the information for requesting verification of the original plaintext to be signed is encrypted and the original plaintext to be signed to the second terminal, and the second terminal configured to receive the original plaintext to be signed and the encrypted value, decrypt the information for requesting verification of the original plaintext to be signed by decrypting the encrypted value, display the original plaintext to be signed when the original plaintext to be signed or a hash value of the original plaintext to be signed matches the decrypted information for requesting verification of the original plaintext to be signed, receive a verification signal from a user, generate an original verification message (here, the original verification message refers to information indicating that the original plaintext to be signed is verified by the user and the information can be proved using a key held by the second terminal and verified using the key held by the first terminal) and transmit the original verification message to the first terminal.
Abstract:
Disclosed are an apparatus and method for providing a digital signature. The apparatus includes a certificate unit, an input unit receives a selection input for a certificate related to signature content received from a signature-requesting terminal, and a control unit for determining whether the certificate unit is capable of performing a digital signature function corresponding to a selected certificate. If the certificate unit is capable of performing the digital signature function, the certificate unit creates a digital signature based on a private key corresponding to the selected certificate when the control unit commands the certificate unit to create a digital signature. Further, if the certificate unit is not capable of performing the digital signature function, the control unit creates a digital signature based on a private key corresponding to a certificate selected from the certificate unit. The control unit transmits the digital signature to the signature-requesting terminal.