EXHIBIT 21



SUBSIDIARIES OF THE REGISTRANT



|                                        |  |                                                                        |  |                              |  |                       
|--------------------------------------- |  | ---------------------------------------------------------------------- |  | ---------------------------- |  | ----------------------
|Subsidiary Legal Name                   |  | Address of Subsidiary                                                  |  | Jurisdiction ofIncorporation |  | Percentage ofOwnership
|Entrust Limited                         |  | 1000 Innovation Drive Ontario Ottawa, Canada K2K 3E7                   |  | Ontario                      |  | 100%                  
|                                        |  |                                                                        | 
|Entrust (Europe) Limited                |  | Apex Plaza B2 Forbury Road Reading, Berkshire, UK FG1 1AX              |  | England                      |  | 100%                  
|                                        |  |                                                                        | 
|r3 Security Engineering AG              |  | c/o Praeger Dreifuss Muhlebachstrasse 6 CH  8008 Zurich, Switzerland  |  | Switzerland                  |  | 100%                  
|                                        |  |                                                                        | 
|Entrust GmbH                            |  | Munich Airport Center Terminalstrasse Mitte 18 Munich, Germany 85356   |  | Germany                      |  | 100%                  
|                                        |  |                                                                        | 
|Entrust Technologies (Switzerland) GmbH |  | c/o Praeger Dreifuss Muhlebachstrasse 6 CH  8008 Zurich, Switzerland  |  | Switzerland                  |  | 100%                  
|                                        |  |                                                                        | 
|Entrust International L.L.C.            |  | One Hanover Park 16633 Dallas Parkway Suite 800 Addison, TX 75001      |  | Delaware                     |  | 100%                  
|                                        |  |                                                                        | 
|CygnaCom Solutions, Inc.                |  | 7927 Jones Branch Drive Suite 100 West McLean, VA 22101-3305           |  | Virginia                     |  | 100%                  
|                                        |  |                                                                        | 
|enCommerce, Inc.                        |  | 455 El Camino Real Santa Clara, California 95050                       |  | California                   |  | 100%                  
|                                        |  |                                                                        | 
|Entrust s.a.r.l.                        |  | 90, Aveue des Champs Elysees Paris, France 75008                       |  | France                       |  | 100%                  
|                                        |  |                                                                        | 
|enCommerce Limited                      |  | Apex Plaza Forbury Road Reading, Berkshire UK RG1 1AX                  |  | England                      |  | 100%                  
|                                        |  |                                                                        | 
|Entrust (China) Limited                 |  | c/o Baker and McKenzie 1401 Hutchison House 10 Harcourt Road Hong Kong |  | Hong Kong                    |  | 100%