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The following procedures can be used to implement basic Solaris security measures.
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A secret is a piece of information known only to one or more persons that is, something kept hidden from others or known only to oneself or to a few other people. To ensure secrecy, the data is encoded in a form that can be decoded only by the intended persons. Cryptology is the field of study underlying the development of new methods of encoding secrets (cryptology), and inverse methods to break those techniques (cryptanalysis). Cryptography involves the design of new ciphers and enhancement of existing ciphers, which are algorithms that convert the source data (plaintext) into a secret (ciphertext). The encoding process is known as encryption, and the decoding process is called
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decryption. A large integer, known as a key, is central to the encryption and decryption process and, depending on the algorithm, a different key may be used for encryption and decryption. Algorithms that use only a single key for encryption and decryption are called symmetric, while algorithms that use two separate keys are known as asymmetric. An individual user usually wants to encrypt their own data and ensure secrecy from everyone else, in which case a symmetric algorithm typically suffices. The drawback for sharing data secretly with multiple users is that once the key is known to one unauthorized user, then all users data is compromised. This is where asymmetric algorithms come into play the encoding key can be compromised, but the data will still be protected unless the decoding key is known to an attacker, because the decoding key cannot be derived from the encoding key. Given that much data in defense, commerce, and government spheres must be kept secret, it s little surprise that cryptography is what most lay people associate with security. However, as you ve seen from the other requirements of security in this chapter, secrecy is only one part of the overall equation if data is inauthentic, inaccurate, and lacks integrity, then there s little point in keeping it secret. This section examines basic aspects of how both symmetric and asymmetric cryptography are used in modern applications to ensure secrecy of data.
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In UNIX, a simple symmetric key encryption system is made available through the crypt command. crypt takes a passphrase entered on the command line and uses it to encrypt plaintext from standard input. The plaintext is passed through a stream cipher, and crypt then sends the ciphertext to standard output. Consider a simple example. Imagine that a list of secret agents names is stored in a flat-file database called agents.txt. To protect these identities, you need to encrypt the data and store the ciphertext in a file called agents.crypt. You also need to select an appropriate passphrase in order to protect the data in this case, use a random string of 78hg65df. Thus, to encrypt the file, you would use the following command:
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% crypt 78hg65df < agents.txt > agents.crypt; rm agents.txt
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Since the contents of agents.crypt would contain binary data, you could view the ciphertext using the following command:
% strings agents.crypt 8rgj5kg_-90fg++fg8ijrfssfjghkdfmvv 8dg0gf90ggd,rkf8b8fdk234,k_+_7gfsg
To decrypt the ciphertext, and recover the plaintext, the crypt command can also be used. The passphrase 78hg65df will need to be supplied. If the passphrase is lost, then the data is not recoverable unless brute-force cracking is attempted.
Part III:
Security
It looks like crypt solves all of your secrecy problems, but actually there are several problems with this simple scenario. The first problem is that when the crypt command is executed, the passphrase appears in the clear in the process list, making it visible to any user who is scanning the list on a regular basis for the token crypt . A cracker might be able to determine the average file size on the system and the average time it takes to encrypt that file size under an average system load. If average encryption time for an average file is ten minutes, then a simple cron using the command ps eaf | grep crypt would intercept many of the crypt invocations. These could be e-mailed to the attacker when detected, thereby bypassing the secrecy measures implemented. The second problem with the preceding simple example is that the cipher used by the crypt program is much less secure than current standards, making it susceptible to brute-force cracking attacks. Other symmetric key ciphers that could be used include the 56-bit Data Encryption Standard (DES). A modified DES variant known as triple-DES encrypts the plaintext, then further encrypts this first ciphertext, and again encrypts the second ciphertext to yield a third and final ciphertext. Clearly, this is more secure than one pass but the success of cryptanalytic attacks depends on the size of the keys involved, and also on the nature of the plaintext. Many attacks are based on the fact that in natural language, there are differences in character and word frequency so the word the appears in natural language much more frequently than hippopotamus. Also, knowing even a small section of the plaintext can assist in cryptanalysis. Imagine if every company invoice was encrypted the company s name would appear on every invoice and would provide an excellent starting point for examining commonalities between the ciphertext of all invoices. If data is only available for a short period of time, and just needs to be scrambled, then a compression algorithm may be utilized. These make use of the redundancies previously described to recode the plaintext into a compressed text. By inspection, the compressed text appears to be ciphertext. There is much interest in combining compression and cryptography where data security is required, in applications where bandwidth is limited. For example, studio-quality video streaming should be encrypted between sender and receiver, but should be compressed as much as possible without sacrificing quality to minimize bandwidth use.
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