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IBM System/360 System Programmer's Guide

IBM System/360
137 pages
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IMPLEMENTING
DATA
SET PROTECTION
To
prepare
for
use
of
the
data
set
protection
feature
of
the
operating
system,
you
place
a
sequential
data
set,
named
PASSWORD,
on
the
system
residence
volume.
This
data
set
must
contain
one
record
for
each
data
set
placed
under
protection.
In
turn,
each
record
contains
a
data
set
name,
the
password
for
that
data
set,
a
counter
field,
a
protection
wode
indicator,
and
a
field
for
recording
any
information
you
desire
to
log.
On
the
system
residence
volumei
these
records
are
formatted
as
a
"key
area"
(data
set
name
and
password)
and
a
"data
area"
(counter
field,
protection
mode
indicator,
and
logging
field).
The
data
set
is
searched
on
the
"key
area."
You
must
write
routines
to
create
and
maintain
the
PASSWORD
data
set.
These
routines
may
be
placed
in
your
own
litrary
or
the
system's
linkage
editor
library
(SYS1.LINKLIB).
You may
use
a
data
management
access
method
or
EXCP
programming
to
handle
the
PASSWORD
data
set.
If
a
data
set
is
to
be
placed
under
protection,
it
must
have
a
protection
indicator
set
in
its
lacel
(DSCB
or
header
1
tape
label).
This
is
done
by
the
operating
system
when
the
data
set
is
created.
The
protection
indicator
is
set
in
response
to
an
entry
in
the
LABEL=
Darameter
of
the
DD
statement
associated
with
the
data
set
being
placed
under
protection.
The
Job
Control
Lan~
publication
describes
the
entry
Note:
Data
sets
on
magnetic
tape
are
protected
only
when
standard
labels
are
used.
The
balance
of
this
chapter
discusses
the
PASSWORD
data
set
charac-
-teristics
and
record
format,
the
creation
of
protected
data
sets,
and
operating
characteristics
of
the
data
set
protection
feature.
PASSWORD
DATA
SET CHARACTERISTICS
AND
RECORD
FORMAT
The
PASSWORD
data
set
ITust
reside
en
the
same
voluwe
as
your
operating
system.
The
space
you
allocate
to
the
PASSWORD
data
set
must
be
contiguous,
i.e.,
its
DSCB
must
indicate
only
one
extent.
The
amount
of
space
you
allocate
is
dependent
on
the
number
of
data
sets
your
installation
desires
to
place
under
protection.
The
organization
of
the
PASSWORD
data
set
is
physical
sequential,
and
the
content
is
unblocked
format-F
records,
132
bytes
in
length
(key
area
plus
data
area).
The
following
illustration
shows
the
password
records
as
you
would
build
them
in
a
132
byte
work
area.
Explanation
of
the
fields
follows
the
illustration.
"
~52
byte
"key"
.
80
byte
'data
area
~
44
bytes
-
8
.-
/3
bytes
77
bytes
..
~
....
bytes
fully
qualified
pass-
logging
field
data
set
name
word
(optional
informa-
tion)
j~
~
•
mode
indi-
protect10n
cator
- ]
byte
'-----
b1nary
counter
-
b
2
yte
s
The
name
of
the
protected
data
set
being
opened
and
the
password
entered
by
the
operator
are
watched
against
the
52-byte
"key
area."
The
112

Table of Contents

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IBM System/360 Specifications

General IconGeneral
BrandIBM
ModelSystem/360
CategoryDesktop
LanguageEnglish

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