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Essays Archive - Reading Australia
Many systems break because they rely on user-generated passwords. Left to themselves, people don't choose strong passwords. If they're forced to use strong passwords, they can't remember them. If the password becomes a key, it's usually much easier--and faster--to guess the password than it is to brute-force the key; we've seen elaborate security systems fail in this way. Some user interfaces make the problem even worse: limiting the passwords to eight characters, converting everything to lower case, etc. Even passphrases can be weak: searching through 40-character phrases is often much easier than searching through 64-bit random keys. We've also seen key-recovery systems that circumvent strong session keys by using weak passwords for key-recovery.
The "timing attack" made a big press splash in 1995: RSA private keys could be recovered by measuring the relative times cryptographic operations took. The attack has been successfully implemented against smart cards and other security tokens, and against electronic commerce servers across the Internet. Counterpane and others have generalized these methods to include attacks on a system by measuring power consumption, radiation emissions, and other "side channels," and have implemented them against a variety of public-key and symmetric algorithms in "secure" tokens. We've yet to find a token that we can't pull the secret keys out of by looking at side channels. Related research has looked at fault analysis: deliberately introducing faults into cryptographic processors in order to determine the secret keys. The effects of this attack can be devastating.
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This I Believe is an international organization engaging people in writing and sharing essays describing the core values that guide their daily lives. Over 125,000 of these essays, written by people from all walks of life, have been archived here on our website, heard on public radio, chronicled through our books, and featured in weekly podcasts. The project is based on the popular 1950s radio series of the same name hosted by Edward R. Murrow.
Women in Photography Archive - Essays
Counterpane has spent years designing, analyzing, and breaking cryptographic systems. While we do research on published algorithms and protocols, most of our work examines actual products. We've designed and analyzed systems that protect privacy, ensure confidentiality, provide fairness, and facilitate commerce. We've worked with software, stand-alone hardware, and everything in between. We've broken our share of algorithms, but we can almost always find attacks that bypass the algorithms altogether. We don't have to try every possible key, or even find flaws in the algorithms. We exploit errors in design, errors in implementation, and errors in installation. Sometimes we invent a new trick to break a system, but most of the time we exploit the same old mistakes that designers make over and over again.
We often find systems that "void the warranty" of their cryptography by not using it properly: failing to check the size of values, reusing random parameters that should never be reused, and so on. Encryption algorithms don't necessarily provide data integrity. Key exchange protocols don't necessarily ensure that both parties receive the same key. In a recent research project, we found that some--not all--systems using related cryptographic keys could be broken, even though each individual key was secure. Security is a lot more than plugging in an algorithm and expecting the system to work. Even good engineers, well-known companies, and lots of effort are no guarantee of robust implementation; our work on the U.S. digital cellular encryption algorithm illustrated that.
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Essay Archive, L Three Essay Dissertation Proposal Example,
Skilled workers were increasingly in demand as manufacturing, managerial, professional and technical occupations grew in importance. Despite this economic shift, the immigration rate of unskilled and undereducated sponsored immigrants remained high, contributing to growing unemployment.The White Paper on Immigration was tabled in Parliament in 1966 by Jean Marchand, the minister in charge of the newly formed Department of Manpower and Immigration.
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