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Blowfish is a variable-length, symmetric, 64-bit block cipher. Designed by Bruce Schneier in 1993 as a "general-purpose algorithm," it was intended to provide a fast, free, drop-in alternative to the aging Data Encryption Standard (DES) and International Data Encryption Algorithm (IDEA) encryption algorithms.
Unpatented and available free for all users and uses, Blowfish is significantly faster than DES and IDEA. However, due to its small block size, it couldn't completely replace DES. The algorithm's 64-bit block size is considered insecure and makes it vulnerable to birthday attacks, timing attacks and data leaks.
Twofish, its successor, addressed the security problem with a larger block size of 128 bits, which is why Schneier himself has recommended that people transition from Blowfish to Twofish. But its security concerns notwithstanding, full Blowfish encryption has never been broken -- via a concept known as cryptanalysis -- and the algorithm is included in many cipher suites and encryption products available today, including applications like virtual private networks, antivirus software and password managers.
Blowfish is a type of symmetric encryption, meaning the same key is used to both encrypt and decrypt data. It…
Blowfish, also known as puffer fish, is undeniably one of the top winter delicacies.
The clean, light taste of the fish meat with its unique chewy texture stands out among other types of edible fish.
Rich in essential amino acid taurine, blowfish is known to help with blood circulation and warm up the body. It does not contain neutral fat, which can help with weight loss and protects healthy skin. The blowfish skin has abundant selenium, a source studied to have anti-cancer effects.
Called "bok" in Korean, there are over 10 different types of blowfish, but the common ones caught in Korea appear to have white bellies and dark gray backs with black dots.
When threatened, bok instantly inflates itself and turns into the form of a round-shaped ball to scare away predators.
But contrary to their intention, self-inflation is not the real threat.
Some blowfish contain tetrodotoxin, a type of toxin that when consumed, can lead to extreme difficulty in breathing and can paralyze one's body, ultimately resulting in death just several hours later. Historical archives show that countless people have died while consuming bok during the Joseon era, although this seldom happens today.
Therefore, in Korea, only trained…
By Bill Gatliff, Courtesy of Embedded Systems Programming
Jul 15 2003 (11:00 AM)
URL: http://www.embedded.com/showArticle.jhtml?articleID=12800442
Many embedded systems depend on obscurity to achieve security. We often design systems to download unsigned or unencrypted firmware upgrades or store unencrypted user data, a practice we justify because it's invisible to the end user and makes our lives easier. The stealthy practice, however, is no longer kosher. With the help of this public-domain encryption algorithm, we can clean up our act.
Modern embedded systems need data security more than ever before. Our PDAs store personal e-mail and contact lists; GPS receivers and, soon, cell phones keep logs of our movements;[1] and our automobiles record our driving habits.[2] On top of that, users demand products that can be reprogrammed during normal use, enabling them to eliminate bugs and add new features as firmware upgrades become available.
Data security helps keep private data private. Secure data transmissions prevent contact lists and personal e-mail from being read by someone other than the intended recipient, keep firmware upgrades out of devices they don't belong in, and verify that the sender of a piece of information is who he says he is. The sensibility of data…