Exhibit 21

SUBSIDIARIES OF THE COMPANY



|                                                            |  |                                   
|----------------------------------------------------------- |  | ----------------------------------
|Name                                                        |  | State or Province of Incorporation
|                                                            | 
|API Cryptek Inc. d/b/a ION Networks                         |  | Delaware                          
|                                                            | 
|API Electronics Group Corp.                                 |  | Ontario                           
|                                                            | 
|API Electronics, Inc.                                       |  | Delaware                          
|                                                            | 
|API Nanofabrication and Research Corporation d/b/a NanoOpto |  | Delaware                          
|                                                            | 
|API Nanotronics Holdings Corp.                              |  | Ontario                           
|                                                            | 
|API Nanotronics Sub, Inc.                                   |  | Ontario                           
|                                                            | 
|Cryptek Holdco UK Limited                                   |  | United Kingdom                    
|                                                            | 
|Cryptek USA Corp.                                           |  | Delaware                          
|                                                            | 
|Emcon2007 Holdco Inc.                                       |  | Canada                            
|                                                            | 
|Emcon Emanation Control Ltd.                                |  | Canada                            
|                                                            | 
|Filtran Inc.                                                |  | New York                          
|                                                            | 
|Filtran Limited                                             |  | Ontario                           
|                                                            | 
|Keytronics Inc.                                             |  | New York                          
|                                                            | 
|National Hybrid, Inc.                                       |  | New York                          
|                                                            | 
|Pace Technology, Inc.                                       |  | Florida                           
|                                                            | 
|Secure Computer Systems Ltd.                                |  | United Kingdom                    
|                                                            | 
|Secure Systems & Technologies, Ltd.                         |  | United Kingdom                    
|                                                            | 
|TM Systems II, Inc.                                         |  | Delaware