Historical logging is a complete recording of all data passed through a particular device. These devices can include databases being accessed and can be as intricate as recording every keystroke and mouse click performed by the end user. It will also track the user’s ID and the device being used. All of this data is commonly collected by host computers and stored on many different backup devices like CD, disk or tape.

Statistical logging is a more efficient but similar method to historical logging, but statistics are kept on each data port instead. This statistics might include which users were logged on to which ports, the amount of time logged on, the files accessed, and other information about transactions that occurred. All of this data can be st

Although all of these layers have their specific functions, they all contribute to network security. As with anything, the security these layers provide is not perfect. This is witnessed everyday because of all of the hackers penetrating networks throughout the world infecting virus after virus.

There are two basic types of encryption in use today. The first is called private key, which is known as a single or symmetrical key, and the other is known as secret key encryption and public or asymmetrical key encryption. With symmetrical encryption, the same key is used for both encryption and decryption. The key is kept secret so that unauthorized parties cannot complete the decryption process because the key should never be disclosed, hence the name “secret key”. Asymmetrical encryption solves the problem of maintaining key security by having separate keys for encryption and decryption, which uniquely match each other, but are not predictable from each other. The term’s secret, public, symmetrical and asymmetrical keys all refer to encryption and decryption schemes.

This paper presented a high level overview of the network security terms: historical and statistical logging, file security, firewalls, secret, public, symmetrical and asymmetrical keys, digital certificates and digital postmarks. Also, it briefly discussed the type of security associated with each layer of the OSI model.

A Digital Postmark provides proof that a certain document was mailed on a certain date. Essentially, what the digital postmark does is prove that a document existed at a specific point in time and that the document was not tampered with from the time it was received. These two digital technologies store electronic information to ensure the security of the data. A digital certificate stores several pieces of key personal information so it can be verified that the certificate is authentic. A digital postmark electronically marks a document to ensure that it was not tempered with before delivery.

Some topics in this essay:
OSI Let’s, Logging Historical, Asymmetrical Keys, Security Firewalls, TCP UDP, Internet Digital, Digital Postmark, , Postmarks Digital, FTP Telnet, file security, digital certificates, session layer, secret public, link layer, statistical logging, data link layer, transport layer, data link, session layer manages, historical logging, digital certificate, file security firewalls, symmetrical asymmetrical keys, historical statistical logging,