java barcode reader library free Advanced Systems in Software

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Advanced Systems
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Using advanced systems such as one-time-passwords makes a lot of sense for critical systems that are infrequently accessed It would be extremely hard for a hacker to compromise a system where the list of passwords is encrypted, burned to a CD, and locked in a safe An intruder would have to break into the safe and then decrypt the password list Any intruder willing to go that far will probably find it easier to kidnap the system administrator
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Part IV Determining Identity 113
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In general, passwords are not really secure on their own It s often easy for a hacker Determining to intercept the usage, transmission, or storage of passwords Therefore, passwords Identity: Passwords are best used in addition to some other type of authentication device, such as a biometric scanner or a portable identifier For example, when entering a personal ID number (PIN) on a touch screen, a scan is made of the fingerprints Access is granted if both the password and fingerprints match These other authentication systems are described in the following chapters A combination system can also be used to spot compromised passwords A red flag should be raised if a secondary authentication fails, yet the password succeeds By logging and investigating such failures, a security administrator can detect and deactivate compromised passwords
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Determining Identity: Digital Certificates
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A digital certificate is an electronic document that verifiably proves the identity of the bearer
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Technology Overview
On the Internet, nobody knows you re a dog Peter Steiner s cartoon from a 1993 issue of the New Yorker magazine has become an Internet mantra The anonymous nature of Internet transactions has facilitated boisterous and vibrant social communities among those who would otherwise be shy in public Unfortunately, the dark side of the Internet s anonymity is that commercial transactions can quickly lead to fraud How do you know a dog doesn t run the ecommerce site you re about to buy something from How do you prove your identity to someone over a medium that enables the total manipulation of information How can you trust that what you re seeing is for real In the real world, you can prove your identity with a trustworthy photo ID, such as a passport or government-issued identification These contain a photograph that can be quickly matched against the bearer s face Antiforgery techniques help make the document itself trustworthy
Copyright 2004 by J a s on Alba ne s e a nd We s S onne nre ich Click He re for Te rms of Us e
116 Network Security Illustrated Now imagine if these identifications lacked photographs of the bearer Possession of the ID would be the only important factor in proving identity If somebody else got hold of your ID, he or she could easily pretend to be you This is the way many forms of identity used to exist Years ago, driver s licenses did not contain photographs, but after many incidences of fraud and misconduct, photographs were added to improve security The virtual equivalent to a pictureless ID is the digital certificate It contains personal data that can be used to identify the holder It is issued by a trusted organization, which makes the certificate itself trustworthy It is assumed that part of the certificate is kept confidential and can only be presented by the legitimate owner In the Security Considerations section, we ll look at this assumption a bit more carefully For now, pretend that the assumption is valid A complete digital certificate system includes people trying to prove their identity, people trying to verify their identity, and one or more trusted third parties capable of performing the verification as well The entire system is often referred to as a public key infrastructure (PKI) The term public does not mean the entire system is designed for public access Instead it refers to the underlying encryption system that uses a combination of freely shared (public) keys and secret (private) keys Two common types of digital certificates exist: Pretty Good Privacy (PGP) certificates and X509 certificates Both contain personal information about the bearer Both contain a public key used for verifying and decoding information The major difference between the two relates to the nature of the trusted third party that verifies the certificate Pretty Good Privacy is a popular system for digitally signing and encrypting documents The Gnu Privacy Guard (GPG) is a free, open-source version of PGP (which was originally open source but went through some strange legal issues) PGP establishes trust through an orgy of certificate swapping and signing As people get to know and trust one another, they sign each other s certificates The number of signatures and the trustworthiness of the people who sign determine a certificate s overall level of trust Well-known community members have the most heavily signed and highly trusted certificates Getting one of these big cheeses to sign a certificate automatically imparts a great deal of trust and establishes a stronger case for the certificate bearer s identity X509 certificates rely on a trustworthy central certificate authority that can validate the authenticity of a digital certificate This missionary-style approach to certification has the advantage of convenience: Only one organization needs to verify your certificate before it becomes trustworthy Obviously, this puts a great deal of responsibility on the shoulders of the certificate-signing authority They have to prove their trustworthiness to the community or else their certificates are valueless Verisign is the most prominent Certificate Authority as they validate the certificates used on most e-commerce Web sites X509 and PGP-style certificates have advantages and disadvantages when compared to one another X509 certificates can be transparent to an end user and are therefore used heavily in e-commerce Web sites and applications PGP certificates
Part IV Determining Identity 117 are often used for securing interpersonal communications because they don t require a central authority s involvement What people think: People are unaware they are using digital certificates What we think: Every time you exchange data over a site encrypted with Secure Sockets Layer (SSL), you are using digital certificates
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