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I'm trying to encrypt and decrypt a file stream over a socket using RijndaelManaged, but I keep bumping into the exception CryptographicException: Length of the data to decrypt is invalid. at System.Security.Cryptography.RijndaelManagedTransform.TransformFinalBlock(Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount) at System.Security.Cryptography.CryptoStream.FlushFinalBlock() at System.Security.Cryptography.CryptoStream.Dispose(Boolean disposing) The exception is thrown at the end of the using statement in receiveFile, when the whole file has been transferred. I tried searching the web but only found answers to problems that arise when using Encoding when encrypting and decrypting a single string. I use a FileStream, so I don't specify any Encoding to be used, so that should not be the problem. These are my methods: private void transferFile(FileInfo file, long position, long readBytes) { // transfer on socket stream Stream stream = new FileStream(file.FullName, FileMode.Open); if (position > 0) { stream.Seek(position, SeekOrigin.Begin); } // if this should be encrypted, wrap the encryptor stream if (UseCipher) { stream = new CryptoStream(stream, streamEncryptor, CryptoStreamMode.Read); } using (stream) { int read; byte[] array = new byte[8096]; while ((read = stream.Read(array, 0, array.Length)) > 0) { streamSocket.Send(array, 0, read, SocketFlags.None); position += read; } } } private void receiveFile(FileInfo transferFile) { byte[] array = new byte[8096]; // receive file Stream stream = new FileStream(transferFile.FullName, FileMode.Append); if (UseCipher) { stream = new CryptoStream(stream, streamDecryptor, CryptoStreamMode.Write); } using (stream) { long position = new FileInfo(transferFile.Path).Length; whi

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