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Protocol locations within TCP/IP: (a) network security and (b) transport security
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standards-based, flexible solution for deploying a network-wide security policy. IPSec implements network layer encryption and authentication, providing an end-to-end security solution in the network architecture. In this way, end systems and applications can enjoy the advantage of strong security without the need to make any changes. Because IPSec encrypted packets look like ordinary IP packets, they can be easily routed through any IP network, such as the Internet, without any changes to the intermediate networking equipment. The only devices that know about the encryption are the endpoints. This feature greatly reduces the cost of implementation and management.
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IPSec combines several security technologies to protect the confidentiality, integrity, and authenticity of IP packets. IPSec actually refers to several related protocols as defined in RFCs 2401-2411 and 2451. Two of these standards define IPSec and Internet Key Exchange (IKE). IPSec defines the information that is added to an IP packet to enable confidentiality, integrity, and authenticity controls; it also defines how to encrypt the packet data. IKE is used to negotiate the security association between two entities and to exchange keying material. The use of IKE is optional, but it relieves users of the difficult and labor-intensive task of manually configuring security associations. IKE should be used in most real-world applications to enable large-scale, secure communications.
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IPSec provides security services at the IP layer by enabling a system for selecting required security protocols, determining the algorithm(s) to use for the service(s), and implementing any cryptographic keys required to provide the following services:
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Access control Connectionless integrity (a detection method of the IP packet itself) Data origin authentication Rejection of replayed packets (a form of partial sequence integrity) Confidentiality (encryption) Limited traffic-flow confidentiality
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IPSec provides these services through the use of two protocols. The first one, the authentication header (AH) protocol, supports access control, data origin authentication, connectionless integrity, and the rejection of replay attacks, in which an attacker copies a packet and sends it out of sequence to confuse communicating nodes. The second protocol is the encapsulating security payload (ESP) protocol. ESP alone can support confidentiality, access control, limited traffic-flow confidentiality, and the rejection of replay attacks.
NOTE:
ESP and AH can be used in concert to provide all the services.
The Authentication Header Protocol
AH provides data integrity and authentication services for IP packets (see Figure 7-2). These services protect against attacks commonly mounted against open networks. AH uses a keyed-hash function rather than digital signatures because digital signature technology is too slow and would greatly reduce network throughput. Note, however, that AH does not provide confidentiality protection, so data can still be viewed as it travels across a network.
Figure 7-2
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The authentication header protocol
AH contains the following fields:
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Next Header This field identifies the higher-level protocol following AH (for example, TCP, UDP, or ESP). Payload Length This field indicates the length of the AH contents. Reserved This field is reserved for future use. Currently, this field must always be set to zero. Security Parameters Index This field is a fixed-length, arbitrary value. When used in combination with the destination IP address, this value uniquely identifies a security association for this packet (that is, it indicates a set of security parameters for use in this connection). Sequence Number The field provides a monotonically increasing number for each packet sent with a given SPI. This value lets the recipient keep track of the order of the packets and ensures that the same set of parameters is not used for too many packets. The sequence number provides protection against replay attacks. Authentication Data This variable-length field contains the integrity check value (ICV) (see next section) for this packet. It may include padding to bring the length of the header to an integral multiple of 32 bits (in IPv4) or 64 bits (IPv6).
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