/egilh

Learning by doing

Compressible Encryption or No Encryption?

Posted on Wednesday, April 27, 2005 3:32 PM

Larry Osterman shares the story behind the Compressible Encryption option in Outlook.

The reason I like this dialog box is the default setting "Compressible Encryption".  Why?  Because if you select it, you're not encrypting ANYTHING.



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# re: Compressible Encryption or No Encryption?

5/11/2005 12:53 PM by Isha

Compressible encryption is replacement of all 256 characters.

But Which encryption algorithm is used for high encryption(best encryption).

does it use DES? or any other algorithm



# re: Compressible Encryption or No Encryption?

5/11/2005 9:38 PM by Egil Hogholt

As far as I have been able to find out; high encryption uses 56 or 128 bit RC4 (http://www.rsasecurity.com/rsalabs/node.asp?id=2250).

I could be wrong though as it is almost a decade since I left Microsoft.


# Compressible Encryption = weak encryption, uncompressed

8/1/2008 10:46 AM by Fred

"Compressible Encryption" = byte-wise substitution (Caesar), with key based on the CRC32 of the password. Truly weak (against anyone with a tad of knowledge on code breaking) and not compressed.

Source: http://www.passcape.com/outlook_passwords.htm


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