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Route authentication is typically used in conjunction with Cisco router network data encryption Route authentication enables peer encrypting routers to positively identify the source of incoming encrypted data This authentication process occurs each time a new encrypted session is initiated, as discussed in the following section Cisco route authentication is also used to verify the authenticity of routing tables from other routers Prior to the enabling of route authentication, routers trusted the sources sending them routing information An intruder could develop faulty route information and send it to a router The router would update its routing table accordingly, and might then start sending packets to the intruder packets With Cisco IOS route authentication, routers can identify other routers and verify their legitimacy before accepting route updates
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With the development of networks came the flow of data from machine to machine This data often passes through public or uncontrolled networks such as the Internet Data that traverses these unsecured networks is subject to many types of attacks the data can be read, altered, or forged by anybody who has access to the route your data takes By configuring your network to apply encryption to the data before sending it out on a public network, you can significantly reduce the chances of your information being compromised What is encryption Cryptography is the concept of keeping information, especially sensitive information, private; encryption is the process of modifying the appearance of data to make it private Encryption is performed using an algorithm that takes plaintext data and converts it to ciphertext encrypted data A key applied to the algorithm determines the end result of the ciphertext Different keys used on the same plaintext data will result in different ciphertext The level or strength of encryption relies on the key and its length The most well-known encryption algorithm is the US government-endorsed Data Encryption Standard (DES) This encryption is supported by Cisco's network encryption and is discussed further in a later section
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Cisco provides network data encryption at the IP packet level When the data is sent, the IP packet can be seen but the IP contents cannot be read The IP header and upper-layer protocols, TCP or UDP, are not encrypted; but all the data within the packet is encrypted Encryption and decryption take place at peer routers, which must be specifically configured to perform the encryption and decryption of the data No other routers take part in the encryption/decryption process Your peer routers should be chosen based on the final destinations of the data This means your peer routers typically would be perimeter routers placed in front of the public or unprotected network Figure 14-3 illustrates encryption and decryption on the peer routers
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Figure 14-3: Encryption/decryption from peer router to peer router In conjunction with peer router to peer router encryption, router authentication also occurs This is the process by which each peer router positively identifies incoming encrypted data to prohibit attackers from forging transmitted data or being able to identify data that has been tampered with Router authentication occurs each time an encrypted session is established Cisco uses the Digital Signature Standard (DSS), the Diffie-Hellman (DH) public-key algorithm, and the Data Encryption Standard (DES) to implement network data encryption
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Digital Signature Standard (DSS) is used by Cisco to authenticate that the data received is coming from the other peer router Each router has both a public and private DSS key The first step in setting up DSS is sharing and verifying the public key on each peer router This step only occurs once The public keys are shared by creating a public key on a router and propagating it to other peer routers The verification of the public key on other peer routers is done verbally from network administrator to network administrator Although the DSS public key is distributed to all peer routers, the DSS private key is not shared with any other devices Figure 14-4 shows the sharing and verification of the DSS public keys
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Figure 14-4: Sharing and verifying DSS public keys In order for two peer routers to establish an encrypted session, they must first authenticate and generate a temporary Data Encryption Standard (DES) key This key will be used to encrypt the data during the encryption session Connection messages between peer routers provide authentication and the generation of the temporary DES key, as follows: Authentication A router sending a connection message attaches its "signature" a character string created by each router using the DSS private key This signature is verified by the receiving router, using the DSS public key Once this process is complete, the router is authenticated Key generation DES keys are generated by an exchange of Diffie-Hellman (DH) numbers during the connection messages These DH numbers are then used to compute a common DES session key shared by both routers
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Data Encryption Standard (DES)
The Data Encryption Standard (DES) uses a key to encrypt and decrypt IP packets The previous section described how the DES key is determined When the encryption session terminates, the DH numbers and the DES key are discarded New encryption sessions require another set of connection messages to establish new DH numbers and a new DES key
There are several types of DES encryption algorithms Cisco supports the following four types: Basic DES with 8-bit Cipher Feedback (CFB) Basic DES with 64-bit CFB 40-bit variation of DES with 8-bit CFB 40-bit variation of DES with 64-bit CFB Basic DES uses a 56-bit key and an algorithm that scrambles data by running it through multiple iterations of its algorithm Depending on the nature of your business, export laws may require you to use 40-bit DES If you are running a nonexportable image, the DES default will be basic DES with 64-bit CFB DES is a single-key (symmetrical) cryptographic scheme This means a single key is used to encrypt and decrypt the messages As described for DSS, this key is generated by the exchange of DH numbers during the connection messages Certain network devices support two-key (asymmetrical) public-key cryptography Two-key is an alternative to the private-key DES In this scheme, everybody gets a set of keys a public and a private key The public key is distributed freely, and the private key is held secretly To send an encrypted message, you obtain the public key being distributed and use it to encrypt the data The data is sent, and only the destination's private key can decrypt the data
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