[Cryptography] Public-key auth as envisaged by first-year science students

[David Kane-Parry]

On Aug 10, 2016, at 12:29 PM, John Denker <jsd at av8n.com> wrote:
> All these ideas are not new.
> 
>  For example:  In the years leading up to WWII, the Japanese
>  government required all overseas telegrams to be delayed by
>  arbitrary amounts, to help defeat timing-based defenses.
>  Reference:  Kahn.

Kahn makes no references to defeating timing-based defenses in The Codebreakers, except for "The target transmits a false timing signal that disrupts the radar’s function and prevents it from tracking him."

His reference to Japanese-enforced delays in The Codebreakers is only:

“In Tokyo, the President’s message to the Emperor had finally been delivered to Grew after a delay of ten hours.  The chief of the censorship office had ordered that all foreign cables be held up for five hours one day and ten hours the next.  The order had been issued at the request of a lieutenant colonel on the general staff, who asked that this be done ‘as a precaution.’  The President’s ‘triple priority’ message arrived on one of the ten-hour days, was stalled for the required time, and was finally delivered at 10:30 p.m., Tokyo time.”

Is there another reference of Kahn’s that more clearly links the Japanese-enforced delays with defeating timing-based defenses?

- d.