Keys in VS .NET

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Keys
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A key is a set of bits that acts as an input parameter to a crypto-algorithm. Think of the crypto-algorithm as the lock on your front door. That lock is standard, as is the door. Lots of other people have doors and locks that are outwardly identical. But inside the lock are some unique (or almost unique) settings of tumblers that exactly match individual keys.
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Uniqueness of keys
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Keys used in cryptography are almost unique because, like door locks, there is no absolute certainty that two keys are unique. But the chances of two keys being the same are in nitesimally small, as is the chance of your key opening a neighbor s lock.
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Algorithms for encryption and decryption do not need to be and normally are not kept secret. It is the key that is kept secret. It is an important fundamental principle of cryptography that the algorithms be public, standard, widely distributed, and carefully scrutinized. This principle ensures that all the world s cryptographers fully shake out the algorithms for any security aws.2 The key is the variable that makes the algorithm result unique and secret. For some crypto-algorithms, the key may be a random number. For others, such as public-key algorithms, you (or rather, an application on your computer) must carefully choose matched keys a complex, time-consuming mathematical operation by itself. The key space needs to be large. A huge number of possible keys helps prevent guessing attacks. Different algorithms require different key lengths for good security. Most keys today are typically 256 bits or larger.
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See Applied Cryptography by Bruce Schneier (Wiley, 1996). This wasn t the case earlier. Even post World War II, it was thought that the algorithms needed to be top secret. But after those algorithms fell to hackers one after the other, it was determined that the openness policy worked much better.
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APPENDIX
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Shared key cryptography
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Shared-key cryptography uses the same key to encrypt and decrypt a message. This requires that both communicating parties share the same key and, vitally important, keep it secret from the rest of the world. In the shared-key cryptography process, the sender, using the shared secret key, encrypts plaintext into ciphertext. Then, on the receiving end, the recipient decrypts the ciphertext using the same (shared) secret key to read the plaintext originally sent. See gure A.1. As long as you keep the shared key secret, use a reasonably long key, and employ an approved modern crypto-algorithm, there is no way anyone can decipher the ciphertext and get at the data in the message. Your data is safe from prying eyes and attackers. The advantage of shared-key encryption/decryption is that the algorithms are fast and can operate on arbitrarily sized messages. The disadvantage is that this approach creates great dif culties managing a shared key that must be kept secret across a network between message senders and recipients. Still, this is a form of cryptography you run into frequently, because it s the basis of Secure Socket Layer (SSL) security and is the foundation for XML Encryption, which is used heavily in web services and cloud computing security. The next type of cryptography solves the problem of keeping a single shared key secret.
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Public-key cryptography
Public-key cryptography uses a key pair called a private and public key. Because the keys are different, this type of encryption is called asymmetric. You use one from the pair of
Shared (secret) key
Encrypt Plaintext Ciphertext
Decrypt Plaintext
Figure A.1 The shared-key (symmetric) encryption process. Plaintext is encrypted by the sender using the shared (secret) key with a symmetric cryptography algorithm, turning it into ciphertext. The recipient, using the same key and the inverse decryption algorithm, turns the ciphertext back into the original plaintext.
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