Sys doesn't need password to login to sqlplus of 10gr2

I have installed 10gr2 in a unix server, and in that localhost I use sys account to login to sqlplus but I found that it doesn't need password to login, other accounts required password though. However, it needed password for sys when login to em. I didn't modified any file under network/admin. How can I change it to authenticate sys in sqlplus? Thanks in advance

That's OS authentication. As already said, if OS user is member of dba group (or group defined at installation time) then no password is needed. Did you try something like
SQL> connect aaaaa/bbbbb as sysdba
it will work.
If you want to disable it, then add this line to your sqlnet.ora
SQLNET.AUTHENTICATION_SERVICES=(NONE)

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I have tried today to login into the database as sys user and was able to login by providing a blank password. I tired this from sql plus installed in the db host. Why is the db allowing users to login as sys users with blank password? isnt this a authenticatio issue? is there any explanation or usage of this faciltiy.
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[Selecting an Authentication Method|http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/dba.htm#i1006628]
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2
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Dear user13148231,
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SQL*Plus: Release 10.2.0.4.0 - Production on Fri Aug 20 12:25:43 2010
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
Connected to:
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With the Partitioning, OLAP, Data Mining and Real Application Testing options
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SYS                                EXPIRED & LOCKED                 20-AUG-10   20-AUG-10
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SQL*Plus: Release 10.2.0.4.0 - Production on Fri Aug 20 12:27:02 2010
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
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Warning: You are no longer connected to ORACLE.
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Retype new password:
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Sys doesn't need password to login to sqlplus of 10gr2

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