So, while I was lazy with Compress, I'm realistic with Crypt. I'll show you the hooks and entry points and let someone else contribute an encryptor.
// page20.html,v 1.14 2000/04/09 18:24:25 jcej Exp
#ifndef CRYPT_H
#define CRYPT_h
#include "Protocol_Task.h"
/* An interface (adaptor) between your favorite encryption method and
   an ACE_Stream.
*/
class Crypt : public Protocol_Task
{
public:
  typedef Protocol_Task inherited;
  Crypt (void);
  ~Crypt (void);
protected:
  // Moving downstream will encrypt the data
  int send (ACE_Message_Block *message,
            ACE_Time_Value *timeout);
  // And moving upstream will decrypt it.
  int recv (ACE_Message_Block *message,
            ACE_Time_Value *timeout);
};
#endif /* CRYPT_H */