Computer Security – Cryptography
There is a symbiotic relationship between cryptography and the development of high-performance computing systems. Modern-day computers were created at the behest of twentieth-century cryptanalysts. As the complexity of cryptographic systems progressed from mechanical to electronic systems, so did the need to develop more efficient methods to cryptanalyze them.
Computer Security – Definitions
Application-Proxy Gateway Firewall: An advanced firewall that combines lower layer access control with upper layer functionality, and includes a proxy agent that acts as an intermediary between two hosts that wish to communicate with each other.
Boundary Router: A router located at the organization’s boundary with an untrusted external network. In the context of this document, a boundary router is configured to be a packet filter firewall.
Circuit-Level Gateway: A form of [..]
Firewall planning | General Recommendations
The following recommendations for firewall planning and implementation will help administrators plan for firewall placement and implement their firewall policies:
- Placement and Deployment
- Place a packet-filtering firewall at the edge of each discrete network in the organization.[..]
Electronic Credentials
Paper credentials are documents that attest to the identity or other attributes of an individual or entity called the subject of the credentials. Some common paper credentials include passports, birth certificates, driver’s licenses, and employee identity cards.
The credentials themselves are authenticated in a variety of ways: traditionally perhaps by a signature or a seal, special papers and inks, high quality engraving, and today by more complex mechanisms, such as [..]
Understanding Hidden Threats: Corrupted Software Files
Malicious code is not always hidden in web page scripts or unusual file formats. Attackers may corrupt types of files that you would recognize and typically consider safe, so you should take precautions when opening files from other people.
What types of files can attackers corrupt?
An attacker may be able to insert malicious code into any file, including common file types that you would normally consider safe. These files may include [..]