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The basic concept of a VPN is to provide a secure , point-to-point connection across the network between communicating entities A couple of words about security are important to keep our paranoia in check The first question is How much security is enough To answer that question, we must consider the impact on our business if the data we are sending is: 1 2 3 4 Simply Lost Is there a backup mechanism for sending or recovering the data Found by another business (not a competitor) Found by a competitor Actively pursued by a competitor
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In the last case, we must ask How much effort is the competitor willing to invest to get our data The answer to these questions will help us decided how much security is enough Note that in the foregoing example, one can equally substitute the word hacker for competitor
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There are five ways to create a VPN as follows: 1 2 3 4 5 Between desktops Between routers Between firewalls Between VPN specific boxes Integrated boxes
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Although not normally considered a VPN, one can certainly use desktop PCs to encrypt data and send it across the Internet securely Additionally, software is available that runs on a desktop capable of creating a VPN to a firewall or stand-alone VPN device Most VPN equipment vendors offer corresponding software that runs on a laptop or desktop in order to provide a secure path to the home office over the Internet Most of the discussion then involves creating a VPN between business locations, branch offices, and road warriors
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The basic rule is the more secure it is, the less convenient it is to use and the greater impact (negative) it will have on overall system performance The strength of an encryption mechanism is dependent upon the complexity of the calculation and the length of the key The most popular mechanism for which hardware is readily available is Data Encryption Standard (DES), developed by IBM and now standardized The basic key is 54 bits long Triple DES involves simply running the algorithm with a 112-bit key The question here is as always How secure do you need to be The more secure, the larger the key used (or the more times the algorithm is run with different keys) This all takes time to encode and to decode Much has been made lately of the fact that by using thousands of computers, a DES encoded message could be broken in 39 days Keep in mind that this is for one key If we change keys, it would take the crackers and hackers another 39 days Are they (hackers and competitors) motivated to do this The method mentioned above used the brute force attack of guessing keys Changing keys often means that the attackers must start all over again The other encryption standard (not widely supported) is IDEA, which uses 128-bit keys The second basic rule is that encryption performed in hardware is much faster than in software
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A very important part (some say the most important) of an encryption is the mechanism used to disseminate keys Here again, security is the inverse of convenience True, keys
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can be sent in a multiply encrypted file They can also be sent by snail mail or given over the telephone (not very secure) The problem with this private key system is that both communicating parties must have the same key If all locations are talking to the home office, they all must have the same key, or the central office must keep separate key pairs for each location This key management nightmare can be handled in two ways We could use the X509 digital certificate system for key management The other alternative is to use a public key system to encrypt the private key so that they can easily be exchanged
Public Key Cryptography (RSA)
The layman s version (don t try this at home because it won t work as described here) is that each of us thinks up a couple of prime numbers (the bigger the better) One number we keep for ourselves, and the other number we publish on our Web site along with the product of the two prime numbers as our public key Anyone wishing to send us something will use the public key to encrypt it with the public key, and only we can decrypt the message with our private key We can authenticate the source if the sender used his private key to encrypt his signature because only his public key will decrypt his signature This system is secure because of the tremendous amount of processing power it takes to factor large prime numbers (For example, if we could factor the product, we could determine the private key) Unfortunately, performing the encryption and decryption are also processor intensive (read slow ) But it sure solves the key distribution problem Therefore, we could use public key cryptography to encrypt and distribute the keys to all our VPN boxes
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