encryption.mht

一种使用动态公匙加密方式的加密算法

                                Oct=20
                            =
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                                <TD colSpan=3D2><FONT =
class=3Dmessagecontent>The=20
                                origin of the key and more... can be =
found on=20
                                external article (Year 2001):<BR>PHD =
Computer=20
                                Consultants Ltd. Setting the RC4 key in =
Windows=20
                                CryptoAPI <BR>Article Copyright =A9 =
2001,2003 PHD=20
                                Computer Consultants=20
                                =
Ltd.<BR>http://www.phdcc.com/cryptorc4.htm<BR><BR>This=20
                                old article is base on Microsoft =
Q228786:<BR>How=20
                                to export and import plain text session =
keys by=20
                                using CryptoAPI<BR>Article Copyright =A9 =
????=20
                                =
Microsoft.<BR>http://support.microsoft.com/?scid=3Dkb%3Ben-us%3B228786&am=
p;x=3D24&amp;y=3D10<BR><BR><BR><BR>
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                                name=3D1452845><B>the key in =
key.h</B></A></TD>
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                                class=3Dmessagetitle><B>Ray=20
                                Cheng</B>&nbsp;</FONT></TD>
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                                width=3D120><FONT =
class=3Dmessagetitle><B>3:07 18=20
                                Apr=20
                            =
'06</B>&nbsp;</FONT></TD></TR></TBODY></TABLE></TD></TR>
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                                <TD colSpan=3D2><FONT =
class=3Dmessagecontent>Hi=20
                                Jessn,<BR><BR>I was coding based on your =
codes,=20
                                and I run into the problem of =
imports/exports.=20
                                This is what I did.<BR><BR>I see that in =
the=20
                                absence of key.txt, you generate a =
session key=20
                                based on a hard-coded key in key.h. So I =
mimick=20
                                that by doing<BR><BR>HCRYPTKEY =
pkey;<BR>int res=20
                                =3D CryptGenKey(m_prov, CALG_RC4,=20
                                CRYPT_EXPORTABLE, &amp;pkey);<BR>res =3D =

                                CryptExportKey(pkey, 0, PUBLICKEYBLOB , =
0, NULL,=20
                                &amp;size); // to get the =
size.<BR><BR>It=20
                                miserably fails, saying that a bad key =
is=20
                                provided.<BR><BR>Then I tried =
<BR>HCRYPTKEY=20
                                pkey;<BR>int res =3D CryptGenKey(m_prov, =

                                AT_KEYEXCHANGE, CRYPT_EXPORTABLE,=20
                                &amp;pkey);<BR>res =3D =
CryptExportKey(pkey, 0,=20
                                PUBLICKEYBLOB , 0, NULL, &amp;size); // =
to get=20
                                the size.<BR><BR>And I get some hundred =
bytes=20
                                for the key. Then I replaced the key in =
key.h=20
                                with these bytes. It seems to be running =

                                perfectly okay on 1 PC. But then when I =
generate=20
                                the session key on one pc, export it =
into a=20
                                file, import it on another PC, and try =
to=20
                                decrypt whatever that's been encrypted, =
I get a=20
                                Bad Data error (NTE_BAD_DATA). =
<BR><BR>This=20
                                problem doesn't occur when I use your =
key. What=20
                                mistakes have I made in generating this =
key? How=20
                                did you generate that key? <IMG=20
                                =
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                                align=3DabsMiddle><BR><BR><BR><BR>-- =
modified at=20
                                3:48 Tuesday 18th April,=20
                                2006<BR>&nbsp;</FONT></TD></TR>
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                                name=3D1453099>Re: the key in =
key.h</A></TD>
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                                =
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                                <TD style=3D"WIDTH: 9em" noWrap =
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                                width=3D120><FONT =
class=3Dmessagetitle>6:56 18 Apr=20
                                =
'06&nbsp;</FONT></TD><