Encrypt/Decrypt Files using AES Cryptography (Visual Studio) Part 1

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The AES encryption is a symmetric cipher and uses the same key for encryption and decryption. The AES algorithm supports 128, 192 and 256 bit encryption, which is determined from the key size : 128 bit encryption when the key is 16 bytes, 192 when the key is 24 bytes and 256 bit when the key is 32 bytes.
The methods provided by the library accept also a string password instead of a key, which is internally converted to a key with a chosen Hash function.
The optional initialization vector (IV) size is 16 bytes, which is the block size of the algorithm. This is summarized in the table below: #selfhostwcf, #p2pnetworkprogramming,#netcorecommerce