Abstract: A method of identity authentication for VoIP call, used for a first communication device supporting SIP and blockchain transmission technology, the method comprising: requesting an identity signature from a second communication device during a SIP call establishment, receiving the identity signature transmitted by the second communication device, wherein the identity signature is generated by the second communication device according to a private key, querying a public key corresponding to the identity signature from a blockchain server, utilizing the public key to verify the identity signature when obtaining the public key from the blockchain server, so as to generate a verification result, and determining to continue or terminate the SIP call establishment based on the verification result.

Abstract: A webpage content self-protection method includes: running a set of webpage elements of at least one webpage through a browser, wherein at least one portion of webpage elements within the set of webpage elements includes webpage contents of the aforementioned at least one webpage; monitoring a target webpage element within the set of webpage elements to determine whether any content variation event associated to the target webpage element occurs; when the content variation event occurs, storing previous data of the target webpage element, and generating a first password, wherein the first password is a one-time password; trying extracting a second password from the target webpage element, in order to perform password verification; and when failure of extracting the second password occurs or the first password and the second password are different from each other, recovering the target webpage element according to the previous data. An associated server is also provided.

Abstract: A method of identity authentication for VoIP call, used fora first communication device supporting SIP and blockchain transmission technology, the method comprising: requesting an identity signature from a second communication device during a SIP call establishment, receiving the identity signature transmitted by the second communication device, wherein the identity signature is generated by the second communication device according to a private key, querying a public key corresponding to the identity signature from a blockchain server, utilizing the public key to verify the identity signature when obtaining the public key from the blockchain server, so as to generate a verification result, and determining to continue or terminate the SIP call establishment based on the verification result.

Abstract: A webpage content self-protection method includes: running a set of webpage elements of at least one webpage through a browser, wherein at least one portion of webpage elements within the set of webpage elements includes webpage contents of the aforementioned at least one webpage; monitoring a target webpage element within the set of webpage elements to determine whether any content variation event associated to the target webpage element occurs; when the content variation event occurs, storing previous data of the target webpage element, and generating a first password, wherein the first password is a one-time password; trying extracting a second password from the target webpage element, in order to perform password verification; and when failure of extracting the second password occurs or the first password and the second password are different from each other, recovering the target webpage element according to the previous data. An associated server is also provided.

Abstract: An operation method of an electronic device is provided according to one embodiment. The electronic device includes an input interface, an output interface, a storage circuit and a network module, and the operation method includes: receiving an operation instruction through the input interface; generating a service request according to the operation instruction, wherein the service request includes service identification information; and if the network module is not connected to a network, extracting offline service information corresponding to the service identification information from the storage circuit, and presenting the offline service information through the output interface.