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    <p>If you do it like this, it should work:</p> <pre><code>// A: encrypting when writing // 1. create backing storage stream. In your case a file stream using(Stream innerStream = File.Create(path)) // 2. create a CryptoStream in write mode using(Stream cryptoStream = new CryptoStream(innerStream, encryptor, CryptoStreamMode.Write)) { // 3. write to the cryptoStream binaryFormatter.Serialize(cryptoStream, obj); } // B: decrypting when reading // 1. create backing storage stream. In your case a file stream using(Stream innerStream = File.Open(path, FileMode.Open)) // 2. create a CryptoStream in read mode using(Stream cryptoStream = new CryptoStream(innerStream, decryptor, CryptoStreamMode.Read)) { // 3. read from the cryptoStream obj = binaryFormatter.Deserialize(cryptoStream); } </code></pre> <p>There are a couple of problems with your code:</p> <ol> <li><p>You're using an encryptor when reading. This was probably a typo, but it should be a decryptor.</p></li> <li><p>You are flushing the <code>buffer</code>, but that is not enough when using a <code>CryptoStream</code>. Encryptors and decryptors work on blocks of a fixed size. The last block may not have that size, so it needs special treatment. The last block is the one written before the stream is <em>closed</em>, not <em>flushed</em>. Flushing on a CryptoStream does nothing useful, because it cannot write anything of size less than the input block size of the encryptor/decryptor, unless it is the last thing to be written. And on top of this, in general you should always close your streams, no matter what. The <code>using</code> statement is the recommended way of doing it:</p> <pre><code>using(buffer) _binaryFormatter.Serialize(buffer, bObj); </code></pre></li> </ol>
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    1. POHow to encrypt and save a binary stream after serialization and read it back?
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    1. USR. Martinho Fernandes
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    1. POHow to encrypt and save a binary stream after serialization and read it back?
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    1. COSerialization is working but not the deserialization. The error details is as follows: System.ArgumentException : Stream was not readable. at System.IO.BinaryReader..ctor(Stream input, Encoding encoding) at System.Runtime.Serialization.Formatters.Binary.__BinaryParser..ctor(Stream stream, ObjectReader objectReader) at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize(Stream serializationStream, HeaderHandler handler, Boolean fCheck, Boolean isCrossAppDomain, IMethodCallMessage methodCallMessage) at ..
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      1. USAnindya Chatterjee
    2. COWhat are you using as the innerStream? The same stream you used for serialization? You need a stream that can be read from. And, if you wrote to it previously, you'll need to "rewind" it back to the beginning. If it is seekable `stream.Seek(0, SeekOrigin.Begin)` should do the trick. If it isn't seekable, you'll probably need to open it again.
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    3. COI tried it, but this time it gives serialization exception saying System.Runtime.Serialization.SerializationException: The input stream is not a valid binary format. The starting contents (in bytes) are: 3F-17-2E-20-80-56-A3-2A-46-63-22-C4-49-56-22-B4-2E ...
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