| 1 | 2013 | PKC | pc |
| 2 | 2013 | TCC | general chair |
| 3 | 2012 | Asiacrypt | pc |
| 4 | 2012 | Crypto | pc |
| 5 | 2011 | Eurocrypt | pc |
| 6 | 2010 | Eurocrypt | pc |
| 7 | 2008 | TCC | pc |
| 8 | 2008 | Asiacrypt | pc |
| 9 | 2007 | PKC | pc chair |
| 10 | 2005 | Eurocrypt | pc |
| 11 | 2005 | PKC | pc |
| 12 | 2004 | Crypto | pc |
| 13 | 2003 | Crypto | pc |
| 14 | 2003 | PKC | pc |
| 15 | 2002 | Crypto | pc |
| 16 | 2001 | Crypto | pc |
| 17 | 2001 | PKC | pc |
| 18 | 2000 | PKC | pc |
| 19 | 2000 | Asiacrypt | pc chair |
| 20 | 1999 | PKC | pc |
| 21 | 1998 | PKC | pc |
| 22 | 1997 | Crypto | pc |
| 23 | 1996 | Eurocrypt | pc |
| 24 | 1994 | Eurocrypt | pc |
| 25 | 1994 | Asiacrypt | pc |
| 26 | 1993 | Crypto | pc |
| 27 | 1992 | Eurocrypt | pc |