A method, performed by an image processing device, of encrypting image data includes: selecting an encryption target unit from among a plurality units constituting an image; generating a table including identification information about the encryption target unit; generating a first encryption unit including data obtained by encrypting the encryption target unit; generating a second encryption unit including data obtained by encrypting the table; and generating a bitstream including the first encryption unit, the second encryption unit, and units other than the encryption target unit among the plurality of units constituting the image.

A virtual private network (VPN) server connected to a client device within a VPN obtains data for delivery to the client device. The VPN server selects a data stream from a set of data streams of the VPN connection with the client device, where each data stream of the set of data streams has a different encryption context. The VPN server generates a data packet based on the data such that the data packet is encrypted using the encryption context specific to the selected data stream. The VPN server transmits the data packets to the client device via the selected data stream.

A communication system including a first device (1a, 1a′) and a second device (1b, 1b′). The first device (1a, 1a′) comprises a memory storing first-device-specific identification data and the second device (1b, 1b′) comprises a memory storing second-device-specific identification data. The first device (1a, 1a′) is configured to receive a copy of the second-device-specific identification data and to store the copy in the memory of the first device (1a, 1a′) and the second device (1b, 1b′) is configured to receive a copy of the first-device-specific identification data and to store the copy in the memory of the second device (1b, 1b′). The first device (1a, 1a′) is configured to derive a first encryption key from the first-device-specific identification data and the received copy of the second-device-specific identification data. The second device is configured to derive the first encryption key from the second-device-specific identification data and the received copy of the first-device-specific identification data. The first device (1a, 1a′) encrypts transmission data using the first encryption key and transmits the encrypted transmission data to the second device (1b, 1b′). The second device (1b, 1b′) receives the encrypted transmission data from the first device (1a, 1a′) and decrypts the encrypted transmission data using the first encryption key.

Secret application and maintenance policy data is generated for different classes of data. The class of data to be protected is determined and the secret application and maintenance policy data for the determined class of the data to be protected is identified and obtained. Required secrets data representing one or more secrets to be applied to the data to be protected is obtained and then automatically scheduled for application to the data to be protected in accordance with the secret application and maintenance policy data for the determined class of the data to be protected. Maintenance of the one or more secrets is also automatically scheduled in accordance with the secret application and maintenance policy data for the determined class of the data to be protected.

Systems for instant messaging private tags preferably comprise a parser for parsing an instant message for sensitive data and an encryption engine for encrypting the sensitive data. A modified uuencoder is also preferably included for converting the encrypted sensitive data into a data stream that complies with an XML format. Other systems and methods are also provided.

A method for dynamic encryption and signing, a terminal and a server are provided. The method includes that: at least one key and at least one signature are generated through native data; a first predetermined key index and a first random signature index are selected during session connection; a first key and a first signature are located from the at least one key and the at least one signature according to the first key index and the first signature index; session request data is signed with the first signature, and the session request data is encrypted with the first key and sent to a server; and session response data signed with a second random signature and encrypted with a second random key is received from the server after decryption and signature verification by the server over the session request data succeed.

Information is removed from data transmitted over networks and stored in data storage facilities by generating non-informational data as an output from a series of nodes (routers, computing devices or logical routing applications) by using a function that applies random data to the data received at each node. The function may be an XOR and the random data may be a pseudorandom string of the same length as the informational data. The non-informational data may be managed normally without concern for security. When the informational data is needed it can be re-generated using the non-informational data and a cascade of the random data from the series of nodes as inputs to an inverse function (XOR is its own inverse). The random data may be generated from a smaller random seed.

One disclosed example method includes obtaining a meeting cryptographic key; transmitting, from a client device to a video conference provider, a request to initiate an encrypted video conference, the encrypted video conference including a plurality of participants; distributing the meeting cryptographic key to each participant of the plurality of participants; obtaining a public cryptographic key of a key pair, the key pair including the public cryptographic key and a private cryptographic key; encrypting the meeting cryptographic key using the public cryptographic key; transmitting, from the client device to the video conference provider, a request to record the video conference; encrypting audio and video from a microphone and image sensor of the client device using the meeting cryptographic key; transmitting the encrypted audio and video to the video conference provider; and providing the encrypted meeting cryptographic key to the video conference provider.

The present invention disclose a key distribution method. The method includes obtaining, by a first key management system, a shared key of a first network element, where the shared key of the first network element is generated according to a key parameter obtained after the first network element performs authentication or a root key of the first network element; obtaining a service key, where the service key is used to perform encryption and/or integrity protection on communication data in a first service between the first network element and a second network element; performing encryption and/or integrity protection on the service key by using the shared key of the first network element, to generate a first security protection parameter; and sending the first security protection parameter to the first network element. According to present invention, data can be protected against an eavesdropping attack in a sending process.

A robust, computationally-efficient and secure system is described for streaming content from a server to a client device via the Internet or another digital network. Various aspects relate to automated processes, systems and devices for securing a media stream with efficient yet effective digital cryptography. In particular, content may be transmitted in transport stream (TS) format in which all packets are encrypted (e.g., using a cipher block chain), in which control packets are exempted from encryption (e.g., using an electronic codebook), or in any other manner.