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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:

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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.

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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..

One major limitation of symmetric key cryptography is that the same key is required to encrypt and decrypt data. This is fine for protecting individual files from unauthorized users, but many data-protection scenarios require multiple users to interact with each other, when trust has never been established. For example, if a manager in New York needs to exchange sales data with a manager in Buffalo, and this data requires encryption, both managers could simply share the key required to decrypt the data. However, this approach has two problems. First, users tend to apply the same password and key to multiple purposes, meaning that one manager might be able to access the other manager s files; second, what if more than two managers were involved Clearly, passing a password around a user group of 1,000 users is tantamount to having no security at all! A system

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