In the proposed photo certificate, the principal component is the image, for example, the user＇s photo. User-related fields, such as the subject＇s name, the issuer＇s name, and the expiration period, which are meani...In the proposed photo certificate, the principal component is the image, for example, the user＇s photo. User-related fields, such as the subject＇s name, the issuer＇s name, and the expiration period, which are meaningful to users, are embedded into the surface of the photo by using a visible watermark algorithm, so that the reader can capture this information without the requirement for special software. The remaining fields in the certificate are embedded into a marked photo. Later, the whole photo certificate is eryptographically signed by certification authority （CA） private key to guarantee the integrity of our photo certificate. By such arrangement, the eertificate＇s verification is divided into two layers. The first layer is human visual system oriented and the second layer is the software-oriented. User can determine whether the user＇s photo and its subject＇s name are consistent and cheek whether the expired period is valid first. The second layer＇s verification is lunched only when the first layer＇s verification is passed. To sum up, the proposed photo certificate not only inherits the functions of a traditional certificate, but also provides a friendlier operational environment of X.509 certificate.展开更多
The Server-Based Certificate Validation Protocol allows PKI clients to delegate to a server the construction or validation of certification paths. The protocol’s specification focuses on the communication between the...The Server-Based Certificate Validation Protocol allows PKI clients to delegate to a server the construction or validation of certification paths. The protocol’s specification focuses on the communication between the server and the client and its security. It does not discuss how the servers can efficiently locate the necessary PKI resources like certificate or certificate revocation lists. In this paper we concentrate on this topic. We present a simple and effective method to facilitate locating and using various PKI resources by the servers, without modifying the protocol. We use the extension mechanism of the protocol for notifying the servers about PKI repositories, certificates, and revocations. We specify the tasks of the servers and certificate issu-ers and define the messages that are exchanged between them. A proof of concept is given by implementing an SCVP server, a client, and the proposed method in Java.展开更多
文摘In the proposed photo certificate, the principal component is the image, for example, the user＇s photo. User-related fields, such as the subject＇s name, the issuer＇s name, and the expiration period, which are meaningful to users, are embedded into the surface of the photo by using a visible watermark algorithm, so that the reader can capture this information without the requirement for special software. The remaining fields in the certificate are embedded into a marked photo. Later, the whole photo certificate is eryptographically signed by certification authority （CA） private key to guarantee the integrity of our photo certificate. By such arrangement, the eertificate＇s verification is divided into two layers. The first layer is human visual system oriented and the second layer is the software-oriented. User can determine whether the user＇s photo and its subject＇s name are consistent and cheek whether the expired period is valid first. The second layer＇s verification is lunched only when the first layer＇s verification is passed. To sum up, the proposed photo certificate not only inherits the functions of a traditional certificate, but also provides a friendlier operational environment of X.509 certificate.
文摘The Server-Based Certificate Validation Protocol allows PKI clients to delegate to a server the construction or validation of certification paths. The protocol’s specification focuses on the communication between the server and the client and its security. It does not discuss how the servers can efficiently locate the necessary PKI resources like certificate or certificate revocation lists. In this paper we concentrate on this topic. We present a simple and effective method to facilitate locating and using various PKI resources by the servers, without modifying the protocol. We use the extension mechanism of the protocol for notifying the servers about PKI repositories, certificates, and revocations. We specify the tasks of the servers and certificate issu-ers and define the messages that are exchanged between them. A proof of concept is given by implementing an SCVP server, a client, and the proposed method in Java.
