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PGP Desktop and Outlook 2010 iCalendar files

Created: 14 Nov 2012 | 8 comments

Dear Readers,

A friend of mine is using PGP Dekstop on some computers together with Office 2010 x64 on Windows 7 x64. He told me that there is some problem when a user wishes to invite another person to a meeting in Outlook Calendar. For this option, he creates the event, then send an invitation to the others. Now, the problem is: Whenever the ".ics" file is being sent to anyone, the PGP Desktop encrypts the message, but the ics file cannot be decrypted to be acceptable. The PGP Viewer can decrypt the file, the user can Copy-paste the content, to a notepad then save as anything.ics and then it works.

My question: is there any sollution to encrypt the message as it is, but then the reciver can see the calendar as the original form ( so it displayes in the message ) and no need to do that copy-paste thing. 

Additional information: Tha message has to be encrypted at all cost.

 

Thank you in advance!

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Alex_CST's picture

So the ics file doesnt work when its encrypted?  But you need the email to be encrypted?

So you're trying to encrypt the message but not the attachment?

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bertalanimre's picture

Not exactly. I'll try to show it you with examples. 

When I normally recieve a calendar appointment, then it appears as the following:

Sorry, for the Hungarian language, this is a test email I asked for from one of my colleague.

But most of the times I recieve the message like this:

I can decrypt the Message.pgp and then I can see the ics files content which is something like this:

 

X-MS-OLK-FORCEINSPECTOROPEN:TRUE
BEGIN:VTIMEZONE
TZID:Central Europe Standard Time
BEGIN:STANDARD
DTSTART:16011028T030000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:16010325T020000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
ATTENDEE;CN=********@***.**;RSVP=TRUE:mailto:********@***.**
CLASS:PUBLIC
CREATED:20121115T093800Z
DESCRIPTION:valami\n
DTEND;TZID="Central Europe Standard Time":20121115T133000
DTSTAMP:20121115T092949Z
DTSTART;TZID="Central Europe Standard Time":20121115T130000
LAST-MODIFIED:20121115T093800Z
LOCATION:valami
ORGANIZER;CN="Bertalan Imre":mailto:********@***.**
PRIORITY:5
SEQUENCE:0
SUMMARY;LANGUAGE=hu:valami
TRANSP:OPAQUE
UID:040000008200E00074C5B7101A82E0080000000010B0CC231CC3CD01000000000000000
01000000040AF0D067E11054A8C0113E74DEBEC69
X-ALT-DESC;FMTTYPE=text/html:<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//E
N">\n<HTML>\n<HEAD>\n<META NAME="Generator" CONTENT="MS Exchange Server ve
rsion 14.02.5004.000">\n<TITLE></TITLE>\n</HEAD>\n<BODY>\n<!-- Converted f
rom text/rtf format -->\n\n<P DIR=LTR><SPAN LANG="hu"><FONT FACE="Calibri"
>valami</FONT></SPAN><SPAN LANG="hu"></SPAN></P>\n\n</BODY>\n</HTML>
X-MICROSOFT-CDO-BUSYSTATUS:BUSY
X-MICROSOFT-CDO-IMPORTANCE:1
X-MICROSOFT-DISALLOW-COUNTER:FALSE
X-MS-OLK-APPTSEQTIME:20121115T092949Z
X-MS-OLK-AUTOFILLLOCATION:FALSE
X-MS-OLK-CONFTYPE:0
BEGIN:VALARM
TRIGGER:-PT15M
ACTION:DISPLAY
DESCRIPTION:Reminder
END:VALARM
END:VEVENT
END:VCALENDAR
 
The ********@***.** represents my email address. I can copy this text and save as anything.ics and then the Outlook can open it normally. This is my main problem. Is there any way to let the PGP Desktop recognise the attachment recieved and then display it as it should do it normally.
 
We have no exchange server yet, so this is what we use for sharing calendar events.
Alex_CST's picture

Does the meeting request have to be encrypted?  It doesnt sound like a highly confidential thing, you can then create a policy to send in the clear

 

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bertalanimre's picture

Yes, it has to be encrypted. They are confidental enough, to apply an encryption on them. 

Alex_CST's picture

Can you look over this document and see if its relevant?

http://www.symantec.com/docs/TECH194660 

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bertalanimre's picture

I'll forward it to him and when he checked it, I'll response. But I think they won't do the trick.

Option 1: Out of the question
Option 2: Could work, but I think it wont.
Option 3: When will they upgrade PGP Desktop?

Alex_CST's picture

option 3 is a question of microsoft not supporting S/MIME for meeting requests, not a question of them upgrading to PGP Desktop.  I sincerely doubt it will actually happen, so option 2 is really the only viable option open to you.

 

Good luck!

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bertalanimre's picture

They're testing option 2 and so far, it works fine. I'll update you guys in a month or as soon as an error comes up again.