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␈↓ ↓H␈↓␈↓βS␈↓∧ Artificial Intelligence Laboratory, STANFORD UNIVERSITY, Stanford, California 94305
␈↓ ↓H␈↓∧Telephone 415 497-4430␈↓ 	oOctober 27, 1975




␈↓ ↓H␈↓Dr. Robert L. Ashenhurst
␈↓ ↓H␈↓Institute for Computer Research
␈↓ ↓H␈↓The University of Chicago
␈↓ ↓H␈↓Chicago, Illinois 60637

␈↓ ↓H␈↓Dear Bob:

␈↓ ↓H␈↓I␈αwill␈αhave␈αno␈αrejoinder␈αin␈αregard␈αto␈αthe␈αletter␈αfrom␈αC.␈αA.␈αDeavours.␈α However,␈αI␈αthink␈αthe␈αletter
␈↓ ↓H␈↓should␈α
not␈α
be␈α
published,␈α
because␈α
neither␈αFriedman's␈α
article␈α
nor␈α
my␈α
letter␈α
show␈α
unawareness␈αof␈α
the
␈↓ ↓H␈↓points it makes which are all present in Shannon's paper or any book on cryptography.


␈↓ ↓H␈↓Sincerely,



␈↓ ↓H␈↓John McCarthy
␈↓ ↓H␈↓Director
␈↓ ↓H␈↓Professor of Computer Science