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Basic Schematic Diagram
showing how the Horizon System worked, and
how SSC could access any part of the system.
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Single Counter
Post Office
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Single Counter
Post Office
Multi-counter
Post Office
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Post Office
‘Horton
Single Counter
Multi-counter
Post Office
/
Gateway,
ope
Main
Post Office
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single Counter Multi-counter Main Mobile Post
Post Office Post Office Post Office Office
Herkon oF orion .
foe ee ee I
Coubier
onion
Counter Heke aoe
Geo EP Corer coun
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Server Farm
(Liverpool; Bootle)
Single\Counter ‘Multi-counter H Main Mobile Post
Post Office Post Office t Post Office Office
porion ce oe Hef Houron Hoaron Mobic I
— — a coe
onion
Counter Heke aoe
— a
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Server Farm
(Liverpool; Bootle)
Single'Counter :Multi-counter H Main Mobile Post
Post Office Post Office : Post Office Office
perion oe B hoe Honor Mobile I
a oe mB —
onion " i
— Hi te I
Gattoay I Counter
i
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UN
UNIX
UNIX
Server Farm
(Liverpool; Bootle)
Single\Counter
Post Office
Cole
Helle
Ges
Main
Post Office
Mobili: Post
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UNIX J UNIX
_
Server Farm
(Liverpool; Bootle) H
Single\Counter Hl ‘Multi-counter H Main Mobile Post
Post Office Post Office ' Post Office
one :
I _ —
: a
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Routers.
Server Farm
(Liverpool; Bootle)
Multi-counter
Single Counter
e Post Office
Post Office
Main
Post Office
SSC (Bracknell)
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Server Farm
(Liverpool; Bootle)
Multi-counter
Single Counter
e Post Office
Post Office
Main
Post Office
SSC (Bracknell)
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Server Farm
(Liverpool; Bootle)
Multi-counter
Single Counter
e Post Office
Post Office
Main
Post Office
SSC (Bracknell)
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Server Farm
Single Counter
Post Office —
(Liverpool; Bootle)
Multi-counter
Post Office
Main
Post Office
SSC (Bracknell)
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SSC (Bracknell)
WITHOUT THE SPM’s KNOWLEDGE:
to any Horizon
Server Farm
(Liverpool; Bootle)
Multi-counter
Post Office Post Office
wf
.
Single Counter
Post Office
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Single Counter
Post Office
Server Farm
(Liverpool; Bootle)
Post Office
Multi-counter
a
.wand use the secure comms
channels...
SSC (Bracknell)
Main
Post Office
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sto access the gateway
database...
Server Farm SSC (Bracknell)
Main Mobilf Post
Post Office
Single{Counter
Post{Office
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and then any Counter
database, with the Server
1D
Server Farm SSC (Bracknell)
Main
Post Office
Single{Counter
Post{Office Post Office
A
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Server Farm
(Liverpool; Bootle)
Single Counter Multi-counter
Post Office — Post Office
5
OR, we cohild bypass the
Horizon Senjers completely...
a
SSC (Bracknell)
Main
Post Office
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SSC (Bracknell)
_ Server Farm swaccess the gateway
database directly...
Main
Post Office
SinglefCounter
PostfOffice Post Office
A
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SSC (Bracknell)
Server Farm
«then log on to any Counter database directly,
(Liverpool; Bootle)
II either with the SPIM's ID if he was logged in, or
with no ID, or perhaps with an ID we had made up
Multi-counter
Post Office
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It was technically feasible at this point to interfere
with the transactions on the counter, eg sell a
stamp or transfer money from the Post Office to a
bank account.
{f the SPM was logged in at this time, then from an
audit perspective, the SPM would have appeared
responsible for the transaction.
Server Farm
Liverpool; Boot
Multi-counter
Post Office
Single]
Post