Integrity in Java

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163 Integrity
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We are next concerned with assuring the integrity of each message received assuring ourselves that the received message:
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has been completely and correctly delivered by the transport has not been tampered with in transit has not been completely forged by a third party
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Message integrity assures the receiver that it has a complete message from an identified and authenticated source The technique commonly used to assure message integrity is the message digest 1631 Message Digest A message digest is a cryptographically secure annotation delivered with the message It is formed by a computation over the original message contents The receiving end can recompute the digest and compare it with the transmitted digest: if they are equal, the message is intact and unforged Secret information, not part of the message itself, is used to compute the digest If you don't know the secret, you can't compute a message digest acceptable to someone who does know the secret The well known cyclic redundancy check (CRC) is a weaker, non secure form of message digest, usually employed at lower levels of the protocol stack to detect transmission errors (losses, interpolations, or changes in bit values)
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164 Privacy
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Privacy is the prevention of eavesdropping on the conversation Is there any inherent privacy in RMI An RMI transmission is encoded by at least all the protocol layers shown in Figure 161
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Figure 161 RMI protocol stack
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On top of all this, there is usually some kind of application protocol, consisting at least of the class definitions of the objects being transmitted It may be thought that a certain level of privacy is assured in RMI by the sheer number of protocols involved However, IP, TCP, the Java Object Serialization protocol, and JRMP are all published protocols Stripping out the IP and TCP data is a relatively easy exercise, already implemented in network analysers ("sniffers") and TCP/IP traffic analysis programs An eavesdropper would find it quite easy to understand large amounts of plain text, and reasonably possible to decipher application specific data with some knowledge of the application data structures This task is made easier by the fact that RMI annotates serialized class information with a codebase, allowing the eavesdropper possible access to the class files associated with the data For these reasons, eavesdropping over RMI is actually easier than with some other communications systems RMI conversations which require genuine privacy must be encrypted 1641 Encryption The purpose of encryption is to make it infeasibly difficult to eavesdrop on the data in transit Without going into all the gory details of various encryption techniques, the data to be transmitted is first encrypted using a secret key This key does not form part of the message; instead, it has been separately agreed to by the parties to the communication The encryption technique completely obfuscates the message The original message can be recovered by decrypting with the same key, or, in public/private key systems, with the private key, after the message was encrypted with the public key The key is chosen so that guessing it, or trying to crack the message by brute force enumeration techniques, is computationally infeasible would take longer than the lifetime of interest of the message The degree of security of the encryption is related directly to the length of the key: this is why there are 40 bit keys, 56 bit keys, and so on up to (presently) 128 bit keys The longer the key, the
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A comprehensible account of encryption and key distribution techniques is given in Singh The Code Book, 6
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165 Secure Sockets Layer
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Secure Sockets Layer (SSL) is the name of a family of protocols layered over TCP and the Sockets API which provides authentication, integrity, and encryption services[2] SSL provides connection security which has three basic properties:
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Frier, Karlton, and Kocher, The SSL 30 Protocol See also Wagner and Schneier, Analysis of the SSL 30 Protocol
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privacy: encryption is used after an initial handshake to define a secret key the peer's identity can be authenticated reliable: the transport includes a message integrity check
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Implementations of SSL for Java have been available for some time from third party vendors In 1999 Sun introduced the Java Secure Sockets Extension (JSSE), which supports SSL 30, TLS 10, WTLS, and related protocols[3]
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Transport Layer Security (TLS), a semi inter operable superset of SSL 30, is specified in IETF RFC 2264 SSL can be integrated into RMI so that RMI clients and servers communicate over one of the SSL protocols This is done via the socket factory facility described in 11 JSSE includes SSLSocketFactory and SSLServerSocketFactory classes These classes are not implementations of RMIClientSocketFactory and RMIServerSocketFactory respectively, so a little bit of programming "glue" is required to adapt the socket factories to the required RMI socket factory interfaces This fairly trivial exercise in the adapter pattern is left to the reader The JSSE package also includes a secure HTTP URL handler for the HTTPS protocol It may be wondered whether SSL has anything to do with RMI/HTTP tunnelling The answer is "no": the http: tunnelling URL built by the RMI transport is hard wired inside the default socket factory, and cannot be altered to use the https protocol The SSL socket factories create SSLSockets and SSLServerSockets; these extend Socket and ServerSocket respectively These extended socket classes provide two facilities: 1 Both the client and the server can enable specific "cipher suites" An SSL cipher suite implements a policy about whether, and how strongly, the other end must authenticate itself, and about how strongly the data traffic is encrypted JSSE is provided with several cipher suites, depending on your location[4]An SSL session can only be established if an enabled "cipher suite" common to both ends can be found The default configuration supports a number of cipher suites, but does not enable them all
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