Cryptostream Encrypt Decrypt
M.b.v 27-Nov-14 4:3127-Nov-14 4:31I get an IOExeption at this line:FileStream fsOut = new FileStream(outputFile, FileMode.Create);Error message:An unhandled exception of type 'System.IO.IOException' occurred in mscorlib.dllAdditional information: The process cannot access the file 'D:GebruikersMarkMusicWondershare Streaming Audio Recorder20130629Track4.mp3' because it is being used by another process.In the code already the file stream is closed and i did not open the file.What can be the problem??
Cryptostream Encrypt Decrypt Code
Standard disclaimer: in a production setting it is overwhelmingly better to use somebody else's crypto.I don't have the expertise to certify 'Yes, this is secure' (and as I'm some randomer online, you should assume that even if I was actually a world expert!) There are, however, a few things that strike me as red flags. Byte ivSeed = Guid.NewGuid.ToByteArray;In crypto, if you need a random number, you basically always need a cryptographically secure random number.
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Cryptostream Read
NewGuid is not cryptographically secure. Var messageLength = BitConverter.GetBytes(messageLengthAs32Bits);Block ciphers like AES do not claim to obscure the approximate message length, so this is not strictly a vulnerability. Nevertheless if you are vulnerable to any attacks based on the length, then passing the precise length in plaintext makes those attacks a whole bunch quicker and easier to execute. Byte Key = rfc.GetBytes(16);byte IV = rfc.GetBytes(16);The derivation of your key should not be tied to the derivation of your IV.