| Attack on Han et al.'s ID-based confirmer (undeniable) signature at ACM-EC'03 Recent countries visiting this post |  |
 | 4 | United States |
 | 1 |
| Attack on Han et al.'s ID-based confirmer (undeniable) signature at ACM-EC'03 Recent countries visiting this post | |
| 4 | United States |
| 1 |