Trend Micro Inc.

Andrew John Dancer

Mark Chimley

Adam Tuaima

Matthew Baldwin

Bharath Kumar Chandrasekhar

Narasimham Kodukula

There is described an electronic data communication system in which encrypted mail messages for a recipient are sent in two parts: message data encrypted by a symmetric encryption algorithm using a session key and session key data encrypted by an asymmetric encryption algorithm using a public key associated with the recipient. If the recipient uses a webmail service to access the encrypted electronic mail message, the encrypted session key data is sent to a trusted third party server which has access to the private key of the user. The trusted third party server decrypts the encrypted session key using the private key of the user, and then sends the decrypted session key to a remote network device for decryption of the encrypted message.

Electronic data communication system with encryption for electronic messages

A cloud computing environment includes a key management server and a cloud computer system running several virtual machines. A virtual machine hosted by the cloud computer system includes an integrity check module for checking the integrity of the virtual machine and getting identity information of the virtual machine. The integrity check module sends a key request to a key management server, which provides key service to different cloud computer systems. The key management server validates the request and, if the request is valid, provides the key to the virtual machine. The key is used to unlock an encrypted file system in the virtual machine.

Protection of customer data in cloud virtual machines using a central management server

There is described a key server which is connected to a local area network, and an encryption authority transfers private keys for clients of the local area network to the key server. In an embodiment, the key server encrypts outgoing emails using public keys for the recipients and decrypts internal emails using private keys for the recipients. In another embodiment, the clients of the local area network download their respective private keys from the key server so that encryption operations may be performed by client software.

Electronic data communication system

There is described an electronic mail messaging system in which a plurality of user computers are connected to a mail registration server via the Internet. The mail registration server stores plural sets of decryption data, each set being required to decrypt a corresponding encrypted electronic mail message. Following receipt of an encrypted electronic mail message, a user computer communicates with the mailed registration server to effect decryption of the encrypted electronic mail message using the corresponding decryption data stored by the mail registration server. In this way, the accessing of the electronic mail message can be monitored by the mail registration server.

There is described an electronic data communication system in which encrypted mail messages for a recipient are sent in two parts: message data encrypted by a symmetric encryption algorithm using a session key and session key data encrypted by an asymmetric encryption algorithm using a public key associated with the recipient. If the recipient uses a webmail service to access the encrypted electronic mail message, the encrypted session key data is sent to a trusted third party server which has access to the private key of the user. The trusted third party server decrypts the encrypted session key using the private key of the user, and then sends the decrypted session key to a remote network device for decryption of the encrypted message. In this way, although the trusted third party has access to the private key of the user, the trusted third party does not have access to any decrypted message. In another aspect, in order to digitally sign a message, the sender applies a hash function to the message to generate a hash value, and then sends the hash value to the trusted third party server where it is encrypted using the private key associated with the sender in order to generate the digital signature, which is then returned to the sender.

There is described a computer network system in which a computer is in network communication with a server. In order to install a software package on the computer, installation software forming part of the software package is executed which requests entry of an email address for the user of the software package on the computer. The entered email address is then transmitted to the server, which in response sends an email to the email address including a Uniform Resource Locator (URL) addressing a local web server forming part of the software package, with installation information being appended to the URL. When the user of the computer accesses the URL using a web browser, the local web server automatically sends the installation information to the installation software. In this way, it is established that the user of the software package has access to the entered email address.

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Shenington, United Kingdom

Andrew John Dancer