title: XOR on a very big file
body: <p>I would like to XOR a very big file (~50 Go).</p>
  
  <p>More precisely, I would like to do so by XORing each block of 32 bytes of a plaintext file (because of lack of memory) with the key 3847611839 and create (block after block) a new cipher file.</p>
  
  <p>Thank You for any help!!</p>