Encrypted File Transfer in Network Conferencing

The patent applies preliminary action by encrypting files before they are transferred through the network. The encryption process is performed in advance on the host terminal device, ensuring that files are protected before entering the transmission channel, thus resolving the security issue while maintaining operational simplicity.

The patent introduces an intermediary mechanism through the use of encryption algorithms and decryption keys. The encryption process acts as an intermediary layer between the file and the network transmission, protecting the file content while allowing seamless transfer. The server also acts as an intermediary that can decrypt and re-encrypt files during transmission.

The patent applies self-service by enabling terminal devices to autonomously perform encryption and decryption operations using built-in cryptographic modules. The host terminal device automatically encrypts files before upload, and the client terminal device automatically decrypts files during download, eliminating the need for complex manual security management and reducing overall system complexity.

The patent merges the encryption and decryption functions directly into the terminal devices, combining security operations with the existing file transfer functionality. This integration avoids adding separate complex security systems and leverages the terminal devices' existing computational capabilities to handle cryptographic operations.

The patent applies preliminary action by pre-transmitting decryption keys through secure channels or storing them in protected memory before file transfer operations. The keys are prepared in advance and made available to authorized devices without being transmitted over the general network during file transfer, thus maintaining both operational ease and security.

The patent segments the key management process from the file transfer process. Decryption keys are managed separately through secure key distribution mechanisms, while files are transferred through the network. This segmentation ensures that key transmission does not compromise file transfer security, and both operations can proceed independently with appropriate security measures.