Re: IGE mode is broken (Re: IGE mode in OpenSSL)

2006-09-25 Thread James A. Donald
On 9/9/06, Adam Back [EMAIL PROTECTED] wrote: IGE if this description summarized by Travis is correct, appears to be a re-invention of Anton Stiglic and my proposed FREE-MAC mode. However the FREE-MAC mode (below described as IGE) was broken back in Mar 2000 or maybe earlier by Gligor,

Re: IGE mode is broken (Re: IGE mode in OpenSSL)

2006-09-23 Thread Travis H.
On 9/9/06, Adam Back [EMAIL PROTECTED] wrote: IGE if this description summarized by Travis is correct, appears to be a re-invention of Anton Stiglic and my proposed FREE-MAC mode. However the FREE-MAC mode (below described as IGE) was broken back in Mar 2000 or maybe earlier by Gligor, Donescu

Re: IGE mode is broken (Re: IGE mode in OpenSSL)

2006-09-23 Thread Ben Laurie
Travis H. wrote: On 9/9/06, Adam Back [EMAIL PROTECTED] wrote: IGE if this description summarized by Travis is correct, appears to be a re-invention of Anton Stiglic and my proposed FREE-MAC mode. However the FREE-MAC mode (below described as IGE) was broken back in Mar 2000 or maybe earlier

Re: IGE mode is broken (Re: IGE mode in OpenSSL)

2006-09-16 Thread Travis H.
On 9/10/06, James A. Donald [EMAIL PROTECTED] wrote: Typo: We transmit T(k)= {W(k)} + W(k-1)|{W(k-1)} where | means bitwise or, curly brace means encryption. Should read: We transmit T(k) = {W(k)} + ((~W(k-11){W(k-1)}) where ~ means bitwise negation, | means bitwise or, curly brace means

Re: IGE mode is broken (Re: IGE mode in OpenSSL)

2006-09-16 Thread James A. Donald
-- James A. Donald We transmit T(k)= {W(k)} + W(k-1)|{W(k-1)} where | means bitwise or, curly brace means encryption. Should read: We transmit T(k) = {W(k)} + ((~W(k-11){W(k-1)}) where ~ means bitwise negation, | means bitwise or, curly brace means encryption. Travis H. wrote:

RE: IGE mode is broken (Re: IGE mode in OpenSSL)

2006-09-13 Thread Kuehn, Ulrich
-Original Message- From: Ben Laurie [mailto:[EMAIL PROTECTED] Sent: Samstag, 9. September 2006 22:39 To: Adam Back Cc: Travis H.; Cryptography; Anton Stiglic Subject: Re: IGE mode is broken (Re: IGE mode in OpenSSL) [...] In any case, I am not actually interested IGE itself

Re: IGE mode is broken (Re: IGE mode in OpenSSL)

2006-09-13 Thread Ben Laurie
Kuehn, Ulrich wrote: -Original Message- From: Ben Laurie [mailto:[EMAIL PROTECTED] Sent: Samstag, 9. September 2006 22:39 To: Adam Back Cc: Travis H.; Cryptography; Anton Stiglic Subject: Re: IGE mode is broken (Re: IGE mode in OpenSSL) [...] In any case, I am not actually

Re: IGE mode is broken (Re: IGE mode in OpenSSL)

2006-09-13 Thread Ben Laurie
Kuehn, Ulrich wrote: From: Ben Laurie [mailto:[EMAIL PROTECTED] Do I understand correctly? You do want that nobody is able to authenticate a message, however, it shall not be intelligible if manipulated with? Correct. Minx (which is the only place I use IGE) avoids traffic marking

Re: IGE mode is broken (Re: IGE mode in OpenSSL)

2006-09-11 Thread James A. Donald
Typo: James A. Donald wrote: Let P(k) be the kth block of plain text. We prepend a random block, P(0) to the text, and append a fixed block to the end. If anything is altered, the fixed block at the end will not contain the expected data, but will be gibberish. The adversary knows every

Re: IGE mode is broken (Re: IGE mode in OpenSSL)

2006-09-10 Thread Ben Laurie
Adam Back wrote: Hi Ben, Travis IGE if this description summarized by Travis is correct, appears to be a re-invention of Anton Stiglic and my proposed FREE-MAC mode. However the FREE-MAC mode (below described as IGE) was broken back in Mar 2000 or maybe earlier by Gligor, Donescu and Iorga.

Re: IGE mode is broken (Re: IGE mode in OpenSSL)

2006-09-10 Thread Adam Back
On Sat, Sep 09, 2006 at 09:39:04PM +0100, Ben Laurie wrote: There is some more detail here: http://groups.google.ca/group/sci.crypt/browse_thread/thread/e1b9339bf9fb5060/62ced37bb9713a39?lnk=st Interesting. In fact, Gligor et al appear to have proposed IGE rather later than this date

Re: IGE mode is broken (Re: IGE mode in OpenSSL)

2006-09-10 Thread James A. Donald
-- Adam Back wrote: Hi Ben, Travis IGE if this description summarized by Travis is correct, appears to be a re-invention of Anton Stiglic and my proposed FREE-MAC mode. However the FREE-MAC mode (below described as IGE) was broken back in Mar 2000 or maybe earlier by Gligor, Donescu