Abstract: The present invention relates to an encrypted image with a matryoshka structure and a mutual agreement authentication system and method using the same. The encrypted image with a matryoshka structure is used in authentication in an authentication system having a plurality of layers and comprises: a first encrypted image which can be opened by only a server of any one layer of the authentication system; and a second encrypted image which can be opened by only a server of another layer distinguished from the any one layer, wherein any one sealed encrypted image of the first and second encrypted images is embedded and sealed in the other encrypted image.

Abstract: The disclosure relates to a system and method for issuing a digital certificate using an encrypted image, in which a digital certificate is sealed in a digital envelope image so as to protect a digital certificate user from damages caused by hacking, phishing attacks and the like in the course of issuance, update and re-issuance of the digital certificate, and the method for issuing a digital certificate comprises the steps of: storing a user select image for issuing the digital certificate, by a proxy server or a certificate server; and requesting the certificate server to issue the digital certificate and, if the digital certificate is issued, creating a sealed digital envelope image by combining the digital certificate with the user select image and transmitting the digital envelope image to a user terminal.

Abstract: The present invention relates to a system and method for issuing a digital certificate using an encrypted image, in which a digital certificate is sealed in a digital envelope image so as to protect a digital certificate user from damages caused by hacking, phishing attacks and the like in the course of issuance, update and re-issuance of the digital certificate, and the method for issuing a digital certificate comprises the steps of: storing a user select image for issuing the digital certificate, by a proxy server or a certificate server; and requesting the certificate server to issue the digital certificate and, if the digital certificate is issued, creating a sealed digital envelope image by combining the digital certificate with the user select image and transmitting the digital envelope image to a user terminal.