can anyone give me some example of sybase stored procedure.

I want to encrypt a field in table

example:

create table employee_table
{
emp_no int,
emp_name char(30)
emp_ssn_no char (20)
}

suppose I want to encrypt emp_ssn_no, how can i acheive this in Sybase, is there any inbuild function to encypt the field.

Thanks in advance