Here are the advantages of using The Blowfish Algorithm. You can use it for your :
- Manipulates data in large blocks
- Has a 64-bit block size.
- Has a scalable key, from 32 bits to at least 256 bits.
- Uses simple operations that are efficient on microprocessors. e.g., exclusive-or, addition, table lookup, modular- multiplication. It does not use variable-length shifts or bit-wise permutations, or conditional jumps.
- Employs precomputable subkeys. On large-memory systems, these subkeys can be precomputed for faster operation. Not precomputing the subkeys will result in slower operation, but it should still be possible to encrypt data without any precomputations.
- Consists of a variable number of iterations. For applications with a small key size, the trade-off between the complexity of a brute-force attack and a differential attack make a large number of iterations superfluous. Hence, it should be possible to reduce the number of iterations with no loss of security (beyond that of the reduced key size).
- Uses subkeys that are a one-way hash of the key. This allows the use of long passphrases for the key without compromising security.
- Has no linear structures that reduce the complexity of exhaustive search.
- Uses a design that is simple to understand. This facilitates analysis and increase the confidence in the algorithm. In practice, this means that the algorithm will be a Feistel iterated block cipher.
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Encryption
To understand what a brute force attack is, we must first understand the technology that is designed to attack. This technology that I speak of is data encryption. Data Encryption is used to protect code and other information from prying eyes by changing the data based upon keys, which are essentially complicated, lengthy passwords. To obtain access to the data it is necessary to have the key, otherwise the information is rendered useless.
Motive
It is in the interest of some parties, such as hackers, law enforcement, intelligence agencies, etc, to break this encryption and gain access to the data contained within. Brute force attacks are one method used to discover the key needed to unlock the data. It is by far the most rudimentary cracking process, involving trying every combination possible. Imagine forgetting a friend’s phone number and starting at 100 – 0000. And since guessing the right number gets exponentially harder every time a new number set is introduced it could take years to do even for the fastest dialer. In the same way computer systems, hardware or software, attempting to crack a key are limited by power, heat and other variables, as described in the laws of thermodynamics, making extremely long keys impractical to crack.
Entropy
However, a lot of attacks are inherently easier as some may have already noticed from the example above. If you really were to forget a phone number you would know based upon certain outside variables such as country, state, county, city, etc, that many choices can be eliminated. Many numbers can be considered either completely impossible or at the very least, very improbable. As you get more exact with your friend’s lost number the less random choices you would need to make to guess the correctly. This once daunting number starts to seem a little tamer. Certain outside factors such as pressure and temperature can affect a computer systems ability to choose numbers in a random way. This slight leveling of Einstein’s playing field, made possible by the study of entropy, enables brute force attacks to crack keys that seem to be statistically impossible.
Breakdown
Ultimately, using the right encryption combined with the technology available today, brute force attacks are on the loosing team. They are simply unable to tackle the insurmountable mountain of number combinations made available by modern encryption technology. Even advanced hardware designed specifically for the task ultimately will fail when matched with against current encryption methods. So, don’t forget your key inside one of these monsters, the lock smith won’t be much help.