| 1 | 2007 | PKC | pc |
| 2 | 2006 | Asiacrypt | pc |
| 3 | 2005 | PKC | pc |
| 4 | 2004 | PKC | pc |
| 5 | 2003 | PKC | pc chair |
| 6 | 2002 | PKC | pc |
| 7 | 2001 | PKC | pc |
| 8 | 2000 | PKC | pc |
| 9 | 2000 | Asiacrypt | pc |
| 10 | 1999 | PKC | pc |
| 11 | 1998 | Eurocrypt | pc |
| 12 | 1994 | Eurocrypt | pc |
| 13 | 1994 | Crypto | pc chair |
| 14 | 1994 | Asiacrypt | pc |
| 15 | 1993 | Eurocrypt | pc |
| 16 | 1992 | Eurocrypt | pc |
| 17 | 1992 | Auscrypt | pc |
| 18 | 1991 | Asiacrypt | pc |
| 19 | 1990 | Crypto | pc |
| 20 | 1989 | Eurocrypt | pc |