anchor.diff:  
   NOTE: for decrypt, only change `:op` value to `:decrypt`
   
  -You can call `crypto/initialize!` any times as you want, it simply reinitializes 
  +You can call `crypto/initialize!` any times as you want, it simply reinitializes
   the engine.
   
   
  
positive.code: | Tiger                | 192
  | Blake2b              | 512
  | Skein                | 256, 512, 1024, arbitrary size
  |===============================================
  
  
  
negative.code: | Blowfish          | `:blowfish`
  |========================================
  
  Additionally, for good security, is mandatory to combine a block cipher with
  some cipher mode of operation.
  
  .This is a list of currently supported of cipher mode of operation
  