Secure data transmission

Another important factor, when talking about data transmission, is the security of private information. Usually communication protocols are encrypted and have an authentication process before allowing access to the data. From this aspect, Wi-Fi is a bit behind its competitors (Baker, 2005) since the authentication procedure may be optional and usually uses an open system authentication. 

The United States also builds and maintains satellites that provide secure voice and data transmission capability. Equipped with antijamming devices, these form the backbone of an elaborate satellite network that affords commanders from NATO countries a reliable system for worldwide command and control. Other satellites are used to gather intelligence and serve as navigation aids to troops on the ground or... 

Acoustic data fusion is a technique that combines information from multiple receivers or receiving platforms about a common object or channel. Instead of each receiver making a decision, relevant information from the different receivers is sent to a common control unit where the acoustic data is combined and processed (hence the name data fusion). After fusion, a decision can be relayed or fed back to each of the receivers. If data transmission is a concern, due to time constraints, cost, or security, other techniques can be used in which each receiver makes a decision and transmits only the decision. The control unit makes a global decision based on the decisions of all of the receivers and relays this global decision back to the receivers. This is called distributed detection. The receivers can then be asked to re-evaluate their individual decisions based on the new global decision. This process could continue until all of the receivers are in agreement or could be terminated whenever an acceptable level of consensus is attained. 

Data transmission Digital, bit-synchronous, Manchester coding Data security Preamble, error-free start, and end delimiter... 

Protocol and security are the key building blocks of data transmissions and data security. The Internet uses a special language or protocol to ensure safe arrival of data at its intended destination. This language has two parts ... 

Wireless digital communication to and from the final control element is now commercially available. The advantage of a wireless field network is the potentially reduced cost vs. a wired installation. Hurdles for wireless transmissions include security from non-network sources, transmission reliability in the plant environment, limited bus speed, battery life, and the resistance of the process industry to change. Both point to point and mesh architectures are being commercialized at the device level. Mesh architectures utilize the other transmitting devices in the area to receive and then pass on any data transmission, thus re-routing communications around sources of interference. Multiple frequencies within the radio band are utilized to transmit data. 

Once you have your SAS data ready for transport, you need to determine a means to deliver it. There are many ways to send data, but you should strive for process simplicity and data security. To keep your data secure and to comply with 21 CFR-Part 11, you need to encrypt your data files for transport. The best encryption you can use is key exchange high-bit encryption software such as PGP, which creates essentially unbreakable files when used properly. Once your data files are encrypted, you can either send them on physical media such as CD-ROM or send them electronically with secure transmission software such as Secure File Transport Protocol (SFTP). If you need to send data to someone once, a CD-ROM is simple enough to produce. However, if you need to send the data repeatedly, then you should use a more automated electronic method of data exchange. Shell scripts and batch files can be written to automate the electronic data transfer process. 

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