Corrupting files - ReadList.com

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Corrupting files
\ Tom Thekathyil (12 Jun 2006)
. \ Atom Smasher (12 Jun 2006)
. . \ Johan Wevers (13 Jun 2006)
. \ Remco Post (12 Jun 2006)
. . \ zvrba (12 Jun 2006)
. . . \ utternoncesense (12 Jun 2006)
. \ Ingo Klöcker (12 Jun 2006)
. \ Tom Thekathyil (12 Jun 2006)
. . \ Ingo Klöcker (12 Jun 2006)
. . . \ (Samuel ]slund) (13 Jun 2006)
. . . . \ Ingo Klöcker (13 Jun 2006)

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Subject:	Corrupting files
Group:	Gnupg-users
From:	Tom Thekathyil
Date:	12 Jun 2006

A wishes to send message to B.

A encrypts message using B's key. Opens encrypted message and corrupts
the file by altering one or more characters/adding redundant lines of
code, e.g. changes case of first occurrence of 'T' in the code. Saves
file and sends to B.

B will get an error message when trying to decrypt message. However B
knows that the first occurrence of 'T' needs case conversion and edits
file. The edited file is now capable of being decrypted.

Since no one apart from A & B knows how the encrypted file has been
corrupted, this seems to be a method of increasing security.

Question: Is there in theory any way of breaking the corrupted
encryption through brute force?

Regards, tt

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