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tained. An SSL session can include multiple secure connections, and parties can have multiple simultaneous sessions. The SSL specification defines the elements of a session state as follows:
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Session Identifier An arbitrary byte sequence chosen by the server to identify an active or resumable session state. Peer Certificate X.509v3 certificate of the peer. This element of the state can be null. Compression Method The algorithm used to compress data before encryption. Cipher Spec Specifies the bulk data encryption algorithm (null, DES, and so on) and a MAC algorithm (such as MD5 or SHA-1) used for message authentication. It also defines cryptographic attributes such as the hash size. Master Secret server. 48-byte secret shared between the client and the
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Is Resumable A flag indicating whether the session can be used to initiate new connections.
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Furthermore, the SSL specification defines the following elements of a connection state:
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Server and Client Random Byte sequences that are independently chosen by the server and the client for each connection. Server Write MAC Secret The secret key that is used in MAC operations on data written by the server. Client Write MAC Secret The secret key that is used in MAC operations on data written by the client. Server Write Key The symmetric cipher key for data encrypted by the server and decrypted by the client. Client Write Key The symmetric cipher key for data encrypted by the client and decrypted by the server. Initialization Vectors The initialization vector (IV) required for each block cipher used in CBC mode. This field is first initialized by the SSL handshake protocol. Thereafter, the final ciphertext block from each record is preserved for use with the following record. Sequence Numbers Each party maintains separate sequence numbers for transmitted and received messages for each connection. When a party sends or receives a change cipher spec message (see
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later section titled The Change Cipher Spec Protocol ), the appropriate sequence number is set to zero. Sequence numbers are of type uint64 and may not exceed 264-1.
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The Record Layer Protocol
As data is transmitted to and received from upper application layers, it is operated on in the SSL record layer (see Figure 7-16). It is here that data is encrypted, decrypted, and authenticated.
Figure 7-16 Overview of the SSL record layer
The following five steps take place in the record layer: 1. As the record layer receives an uninterrupted stream of data from the upper application layer, the data is fragmented, or broken into manageable plaintext blocks (or records). Each record is 16K or smaller. 2. Optionally, the plaintext records are compressed using the compression algorithm defined by the current session state. 3. A MAC is computed for each of the plaintext records. For this purpose, the shared secret key, previously established, is used.
Network and Transport Security Protocols
4. The compressed (or plaintext) data and its associated MAC are encrypted using the symmetric cipher that has been previously agreed upon for this session. Encryption may not increase the overall length of the record beyond 1,024 bytes. 5. A header is added to each record as a prefix consisting of the following fields: Content Type This field indicates the protocol used to process the enclosed record in the next-higher level. Major Version This field indicates the major version of SSL in use. For example, TLS has the value 3. Minor Version This field indicates the minor version of SSL in use. For example, TLS has the value 1. Compressed Length This field indicates the total length in bytes of the plaintext record. The party receiving this information reverses the process, that is, the decryption and authentication functions are simply performed in reverse.
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Sequence numbers are also included with each transmission so that missing, altered, or extra messages are detectable.
The Change Cipher Spec Protocol
The change cipher spec protocol is the simplest of the SSL-specific protocols. It exists to signal a transition in the ciphering strategies. The protocol consists of a single message, which is encrypted and compressed by the record layer as specified by the current cipher specification. Before finishing the handshake protocol, both the client and the server send this message to notify each other that subsequent records will be protected under the just-negotiated cipher specification and associated keys. An unexpected change cipher spec message should generate an unexpected_message alert.
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