Create a Simple, Reusable Infrastructure for Public Key Encryption Using VB.NET
When using public key encryption, you're vulnerable to tricks dreamed up by untrusted sources, including subtle altering of encrypted messages. In this article you'll learn to foil them using a message hash and new cryptographic classes included in the .NET Framework. Design and implement your own public key cryptography infrastructure and test it with a VB.NET WinForms tester application.
by David Saylor
September 8, 2003
ryptography is the science of transforming messages so that the meaning is hidden (encryption) and recovering the hidden meaning from transformed messages (decryption). A transformed message, in which the meaning is hidden, is called cipher text, while the non-transformed or recovered message, in which the meaning is not hidden, is called plain text. There are many methods of reversible transformation suitable for encryption/decryption applications.
Most modern cryptographic methods treat messages as a sequence of characters represented numerically. These are transformed through mathematical algorithms, involving the use of one or more "keys." A key is a number or group of numbers that, used in a transformation algorithm, transform or restore the numbers that represent the characters of a message. Symmetric cryptographic transformations use the same key for encryption and decryption. The process is therefore described as "symmetrical." Asymmetric cryptography, on the other hand, uses different but mathematically related keys for encryption and decryption.
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ryptography is the science of transforming messages so that the meaning is hidden (encryption) and recovering the hidden meaning from transformed messages (decryption). A transformed message, in which the meaning is hidden, is called cipher text, while the non-transformed or recovered message, in which the meaning is not hidden, is called plain text. There are many methods of reversible transformation suitable for encryption/decryption applications.
