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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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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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is required that allows individual users to encrypt data using one key, and for the file to be decrypted using a separate key for each user Asymmetric encryption allows separate keys to be used for encrypting and decrypting data How is this possible Basically, every user is assigned a private key, which they never release to anyone else, and a public key, which is supplied to other users who need to send the user encrypted data For example, the New York manager would have a private key stored on a floppy disk, locked in a safe, as would the Buffalo manager Both would also exchange their public keys via e-mail, or another offline method such as floppy disk, verifying that the keys were genuine by using a key fingerprints check over the telephone.

To encrypt a file for the Buffalo manager, the New York manager would need to use both his/her own private key and the Buffalo manager s public key Conversely, the Buffalo manager would need to use her private key and the New York manager s public key to encrypt a file for him Remember that if you exchange public keys via e-mail, and have no other method of verifying who is on the other end of the line, then you re ripe for a man in the middle attack, because the person you think you are exchanging data with could be an intermediary For example, imagine if Joe substitutes his key in place of his manager s, and manages to place his machine between a manager s machine and an external router.

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