[ih] Fwd: Internet Protocol Implementation Guide

[John Day]

Sorry forgot to hit Reply-All


> Begin forwarded message:
> 
> From: John Day <jeanjour at comcast.net>
> Subject: Re: [ih] Internet Protocol Implementation Guide
> Date: August 21, 2025 at 10:03:07 EDT
> To: vinton cerf <vgcerf at gmail.com>
> 
> A digital signature across the entire contents of the connection or some portion of it would catch a substitution, but that would seem to have to be done at an upper layer. 
> 
> I was thinking more that with a block cipher (applied to each segment), one would want to use one of several blockchain techniques, so that decrypting one block was dependent on the previous block. (To use the original meaning of blockchain.)
> 
> Also, this would imply that retransmissions had to be on the same boundaries, which was not normally true.
> 
>> On Aug 21, 2025, at 09:53, vinton cerf <vgcerf at gmail.com> wrote:
>> 
>> wouldn't that depend on either the strength of the error check or digital signature or decryption algorithm?
>> 
>> v
>> 
>> 
>> On Thu, Aug 21, 2025 at 9:49 AM John Day via Internet-history <internet-history at elists.isoc.org <mailto:internet-history at elists.isoc.org>> wrote:
>>> Wouldn’t that be susceptible to a substitution attack?
>>> 
>>> > On Aug 21, 2025, at 09:21, Vint Cerf via Internet-history <internet-history at elists.isoc.org <mailto:internet-history at elists.isoc.org>> wrote:
>>> > 
>>> > David, it was always believed that segments might have to be decrypted out
>>> > of order if they were encrypted - that was an important design criterion
>>> > for packet cryptography but maybe you are thinking of something else? We
>>> > assumed the reassembly would take place within a buffer window so they
>>> > could be placed in the right part of the buffer before assembly was
>>> > completed and the result delivered to the next layer up.
>>> > 
>>> > v
>>> > 
>>> > 
>>> > On Thu, Aug 21, 2025 at 9:09 AM David Finnigan via Internet-history <
>>> > internet-history at elists.isoc.org <mailto:internet-history at elists.isoc.org>> wrote:
>>> > 
>>> >> On 20 Aug 2025 4:17 pm, Barbara Denny via Internet-history wrote:
>>> >>> Quite some time ago I sent email out with links to the handbooks
>>> >>> produced by the NIC at SRI. I don't remember if that email also
>>> >>> included the Internet Protocol Implementation Guide.  Sending this
>>> >>> message in case this document wasn't included.
>>> >>> https://apps.dtic.mil/sti/tr/pdf/ADA153624.pdf
>>> >>> The end of the document has an interesting snapshot of the status of
>>> >>> TCP/IP implantations as of June 8, 1982.
>>> >>> barbara
>>> >> 
>>> >> While looking at the sources for some early TCP implementations, I
>>> >> noticed that some of them will process most TCP controls out of order
>>> >> (except FIN), so long as the segment sequence fits within the receive
>>> >> window. Segment text is always kept in sequence to be delivered to the
>>> >> user in correct order, of course.
>>> >> 
>>> >> Who was the one to notice that this was possible, when RFC 793 states
>>> >> that segments "are generally queued and processed in sequence number
>>> >> order" ?
>>> >> --
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>>> > 
>>> > 
>>> > -- 
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>>> > 
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