What is Network Security in Java

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What is Network Security
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connectionless network layer of the Internet to a layer with logical connections! The logical connection defined by a SA is a simplex connection, that is, it is unidirectional If both hosts want to send secure datagrams to each other, then two SAs (ie, logical connections) need to be established, one in each direction A SA is uniquely identified by a 3-tuple consisting of:
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a security protocol (AH or ESP) identifier; the source IP address for the simplex connection; a 32-bit connection identifier called the Security Paramter Index (SPI)
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For a given SA (that is, a given logical connection from source host to destination host), each IPsec datagram will have a special field for the SPI All of the datagrams in the SA will use the same SPI value in this field
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Authentication Header (AH) Protocol
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As mentioned above, the AH protocol provides source host identification and data integrity but not secrecy When a particular source host wants to send one or more datagrams to a particular destination, it first establishes an SA with the destination After having established the SA, the source can send secured datagrams to the destination host The secured datagrams include the AH header, which is inserted between the original IP datagram data (eg, a TCP or UDP segment) and the IP header, as shown in Figure 78-1 Thus the AH header augments the original data field, and this augmented data field is encapsulated as a standard IP datagram For the protocol field in the IP header, the value 51 is used to indicate that the datagram includes an AH header When the destination host recieves the IP datagram, it takes note of the 51 in the protocol field, and processes the datagram using the AH protocol (Recall that the protocol field in the IP datagram is traditionally used to distinguish between UDP, TCP, ICMP, etc) Intermediate routers process the datagrams just as they always have -- they examine the destination IP address and route the datagrams accordingly
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Figure 78-1: Position of the AH header in the IP datagram The AH header includes several fields, including:
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Next Header field, which has the role that the protocol field has for an ordinary datagram It indicates if the data following the AH header is a TCP segment, UDP segment, ICMP segment,
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file:///D|/Downloads/Livros/computa o/Computer%20Netown%20Approach%20Featuring%20the%20Internet/IPsechtm (2 of 5)20/11/2004 15:53:10
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What is Network Security
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etc (Recall that protocol field in the datagram is now being used to indicate the AH protocol, so it can no longer be used to indicate the transport-layer protocol) Security Parameter Index (SPI) field, an arbitrary 32-bit value that, in combination with the destination IP address and the security protocol, uniquely identifies the SA for the datagram Sequence Number field, a 32-bit field containing a sequence number for each datagram It is initally set to 0 at the establishment of an SA The AH protocol uses the sequence numbers to prevent playback and man-in-the-middle attacks (see Section 73) Authentication Data field, a variable-length field containing signed message digest (ie, a digital signature) for this packet The message digist is calculated over the original IP datagram, thereby providing source host authentication and IP datagram integrity The digital signature is computed using the authentication algorithm specified by the SA, such as DES, MD5 or SHA
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When the destination host receives an IP datagram with an AH header, it determines the SA for the packet and then authenticates the integrity of the datagram by processing the authentication data field The IPsec authentication scheme (for both the AH and ESP protocols) uses a scheme called HMAC, which is an encrypted message digest described in [RFC 2104] HMAC uses a shared secret key between two parties rather than public key methods for message authentication Further details about the AH protocol can be found in [RFC 2402]
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