Secure connection from Windows to Unix based Oracle

Greetz!
I hope this is the correct forum to post in for this. I am a .Net developer and I have need to authenticate to an Oracle DB on a UNIX server from a Windows server.
I have a requirement for an excel spreadsheet that takes in a large amount of data and creates a pivot table and several worksheets a few times a day.
It is saved to a SharePoint site where users can download it. We will be moving to SP 2010 in about 8 months but I can't wait for that (of course) and am not convinced that would help this issue.
We are currently on 10g but in the process of 11g. The solution will likely run on 11g (place is nuts..nothing is certain)
I cannot pass credentials using ODBC because it is clear text.
The Oracle instances do not have Oracle Advanced Security turned on.
Is it possible to pass a username/password from the windows server to the unix server securely (encrypted).
Thank you!

Depending on which version of UNIX you are migrating to, transportable tablespaces will require RMAN for conversion.
select * from v$transportable_platform;The ENDIAN_FORMAT determines if conversion is needed. If one platform is BIG and the other is LITTLE, then conversion will be required.

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JAVA Sample code:-
public String method1(int pi_ctry_id,String pi_cur_busi_date ,String pi_eod_bod_flag)
System.out.println("inside main method1");
CachedRowSet tmplcrs                = null;
HashMap resMap                              = new HashMap();
          Double ln_candidate_extra           = 0.0;
          Double ln_calculate_on_val          = 0.0;
          int lv_calculate_on                = 0;
          int lv_cand_attribute                = 0;
// int pi_ctry_id                          = 0;
// String pi_cur_busi_date           = null;
int pi_bch_id                          = 0;
// String pi_eod_bod_flag               = null;
Date ldt_cur_busi_date          = null;
Date lstr_next_calc_date     = null;
int li_bch_id                         = 0;
int li_chg_ac_branch               = 0;
int calFrequency                     = 0;
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Map reqMap = new HashMap();
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System.out.println("inside main method2");
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conn.setAutoCommit(false);
System.out.println("inside main method4");
}

29532, 00000, "Java call terminated by uncaught Java exception: %s"
// *Cause: A Java exception or error was signaled and could not be
//          resolved by the Java code.
// *Action: Modify Java code, if this behavior is not intended.

Secure connection from Windows to Unix based Oracle

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