Концепция открытых систем и задача аутентификации в локальных сетях - page 2

ɞɥɹ ɤɥɢɟɧɬɚ ɢ ɫɟɪɜɟɪɚ ɪɟɫɭɪɫɨɜ ɹɜɥɹɟɬɫɹ ɬɪɟɬɶɟɣ ɞɨɜɟɪɟɧɧɨɣ ɫɬɨɪɨɧɨɣ
&
ɪɟɚɥɢɡɭɸɳɟɣ ɩɨɩɚɪɧɭɸ ɩɪɨɜɟɪɤɭ ɩɨɞɥɢɧɧɨɫɬɢ
(
ɋɭɛɴɟɤɬɚɦɢ ɫ ɬɨɱɤɢ
ɡɪɟɧɢɹ ɫɢɫɬɟɦɵ
E_l\_lim
ɦɨɝɭɬ ɹɜɥɹɬɶɫɹ ɩɨɥɶɡɨɜɚɬɟɥɢ
&
ɤɨɦɩɶɸɬɟɪɵ
&
ɩɪɨɝɪɚɦɦɵ
'
ɤɥɢɟɧɬɵ ɢ ɩɪɨɝɪɚɦɦɵ
'
ɫɟɪɜɟɪɵ
(
Ʉɚɠɞɵɣ ɫɭɛɴɟɤɬ ɨɛɥɚɞɚɟɬ
ɫɜɨɢɦ ɫɟɤɪɟɬɧɵɦ ɤɥɸɱɨɦ
&
ɢ ɞɥɹ ɬɨɝɨ
&
ɱɬɨɛɵ ɫɭɛɴɟɤɬ
'
ɤɥɢɟɧɬ ɩɨɥɭɱɢɥ
ɞɨɫɬɭɩ ɤ ɪɟɫɭɪɫɚɦ ɫɭɛɴɟɤɬɚ
'
ɫɟɪɜɟɪɚ
&
ɨɧ ɞɨɥɠɟɧ ɩɪɨɞɟɦɨɧɫɬɪɢɪɨɜɚɬɶ
ɫɭɛɴɟɤɬɭ
'
ɫɟɪɜɟɪɭ ɡɧɚɧɢɟ ɫɜɨɟɝɨ ɫɟɤɪɟɬɧɨɝɨ ɤɥɸɱɚ
(
ɇɟɨɛɯɨɞɢɦɨ ɩɨɹɫ
'
ɧɢɬɶ
&
ɱɬɨ ɮɚɤɬɢɱɟɫɤɢ ɫɟɪɜɟɪ
E_l\_lim
ɧɟ ɡɚɧɢɦɚɟɬɫɹ ɚɭɬɟɧɬɢɮɢɤɚɰɢɟɣ
ɤɥɢɟɧɬɚ
&
ɨɧ ɥɢɲɶ ɜɵɞɚɟɬ ɧɟɤɨɬɨɪɭɸ ɡɚɲɢɮɪɨɜɚɧɧɭɸ ɢɧɮɨɪɦɚɰɢɸ
ɤɥɢɟɧɬɭ
&
ɩɪɢ ɷɬɨɦ ɬɨɥɶɤɨ ɩɨɞɥɢɧɧɵɣ ɤɥɢɟɧɬ ɦɨɠɟɬ ɪɚɫɲɢɮɪɨɜɚɬɶ ɩɨ
'
ɥɭɱɟɧɧɨɟ ɫɨɨɛɳɟɧɢɟ ɢ ɤɨɪɪɟɤɬɧɨ ɨɛɪɚɛɨɬɚɬɶ ɩɨɥɭɱɟɧɧɭɸ ɢɧɮɨɪɦɚ
'
ɰɢɸ
(
Ɍɟɦ ɫɚɦɵɦ
&
ɜɨɡɦɨɠɧɚ ɩɪɚɜɢɥɶɧɚɹ ɚɭɬɟɧɬɢɮɢɤɚɰɢɹ ɩɨɞɥɢɧɧɨɝɨ
ɩɨɥɶɡɨɜɚɬɟɥɹ ɫɟɪɜɟɪɨɦ ɪɟɫɭɪɫɚ
&
ɚ ɬɚɤɠɟ ɦɢɧɢɦɢɡɢɪɭɟɬɫɹ ɜɟɪɨɹɬɧɨɫɬɶ
ɤɨɦɩɪɨɦɟɬɚɰɢɢ ɩɚɪɨɥɹ
(
Ʉɥɢɟɧɬ ɫɱɢɬɚɟɬɫɹ ɚɭɬɟɧɬɢɮɢɰɢɪɨɜɚɧɧɵɦ
&
ɟɫɥɢ
ɨɧ ɩɪɨɞɟɦɨɧɫɬɪɢɪɨɜɚɥ ɡɧɚɧɢɟ ɫɟɤɪɟɬɧɨɝɨ ɤɥɸɱɚ
(
Ɉɞɧɚɤɨ ɜɨɡɦɨɠɧɚ
&
ɧɚɩɪɢɦɟɪ
&
ɩɟɪɟɫɵɥɤɚ ɤɥɸɱɚ ɦɟɠɞɭ ɫɭɛɴɟɤɬɚɦɢ
&
ɜɫɥɟɞɫɬɜɢɟ ɱɟɝɨ ɧɟɨɛ
'
ɯɨɞɢɦ ɢɧɨɣ ɫɩɨɫɨɛ ɚɭɬɟɧɬɢɮɢɤɚɰɢɢ
(
Ɋɚɫɫɦɨɬɪɢɦ ɜɡɚɢɦɨɞɟɣɫɬɜɢɟ ɧɟɤɨɬɨɪɵɯ ɩɨɥɶɡɨɜɚɬɟɥɟɣ
A
&
B
ɢ
T
ɩɪɢ
ɢɫɩɨɥɶɡɨɜɚɧɢɢ ɩɪɨɬɨɤɨɥɚ
E_l\_lim(
ɉɪɨɬɨɤɨɥ
E_l\_lim
ɩɪɟɞɫɬɚɜɥɹɟɬ
ɫɨɛɨɣ ɪɚɡɧɨɜɢɞɧɨɫɬɶ ɩɪɨɬɨɤɨɥɚ ɇɢɞɯɟɦɚ
†
ɒɪɟɞɟɪɚ
(
ȼ ɪɚɦɤɚɯ ɞɚɧɧɨɝɨ
ɩɪɨɬɨɤɨɥɚ ɩɨɥɶɡɨɜɚɬɟɥɶ
A
"
ɤɥɢɟɧɬ
#
ɢ ɩɨɥɶɡɨɜɚɬɟɥɶ
B
"
ɫɟɪɜɟɪ
#
ɢɦɟɸɬ
ɨɛɳɢɟ
"
ɪɚɡɞɟɥɹɟɦɵɟ
#
ɫɟɤɪɟɬɧɵɟ ɤɥɸɱɢ ɫ ɩɨɥɶɡɨɜɚɬɟɥɟɦ
T
&
ɢɯ ɡɚɞɚɱɚ
‡
ɝɟɧɟɪɢɪɨɜɚɬɶ ɫɟɚɧɫɨɜɵɣ ɤɥɸɱ
&
ɧɟɨɛɯɨɞɢɦɵɣ ɞɥɹ ɨɛɦɟɧɚ ɫɨɨɛɳɟɧɢɹɦɢ
(
Ɋɚɫɫɦɨɬɪɢɦ ɚɥɝɨɪɢɬɦ ɝɟɧɟɪɚɰɢɢ ɬɚɤɢɯ ɤɥɸɱɟɣ
(
+(
ɉɨɥɶɡɨɜɚɬɟɥɶ
A
ɨɬɩɪɚɜɥɹɟɬ ɡɚɩɪɨɫ ɩɨɥɶɡɨɜɚɬɟɥɸ
T
ɫɨ ɫɜɨɢɦ ɢɦɟ
'
ɧɟɦ ɢ ɢɦɟɧɟɦ ɩɨɥɶɡɨɜɚɬɟɥɹ
B
4
(
A, B
)
.
,(
ɉɨɥɶɡɨɜɚɬɟɥɶ
T
ɝɟɧɟɪɢɪɭɟɬ ɫɨɨɛɳɟɧɢɟ
&
ɜɤɥɸɱɚɸɳɟɟ ɦɟɬɤɭ ɜɪɟ
'
ɦɟɧɢ
&
ɡɧɚɱɟɧɢɟ ɜɪɟɦɟɧɢ ɠɢɡɧɢ
L
&
ɫɥɭɱɚɣɧɵɣ ɫɟɚɧɫɨɜɵɣ ɤɥɸɱ
K
ɢ ɢɦɹ
ɩɨɥɶɡɨɜɚɬɟɥɹ
A
(
ɗɬɨ ɫɨɨɛɳɟɧɢɟ ɩɨɥɶɡɨɜɚɬɟɥɶ
T
ɲɢɮɪɭɟɬ ɫ ɩɨɦɨɳɶɸ
ɤɥɸɱɚ
&
ɨɛɳɟɝɨ ɞɥɹ ɧɟɝɨ ɢ ɩɨɥɶɡɨɜɚɬɟɥɹ
B
(
ɉɨɫɥɟ ɷɬɨɝɨ ɩɨɥɶɡɨɜɚɬɟɥɶ
T
ɝɟɧɟɪɢɪɭɟɬ ɜɬɨɪɨɟ ɫɨɨɛɳɟɧɢɟ
&
ɫɨɞɟɪɠɚɳɢɟ ɦɟɬɤɭ ɜɪɟɦɟɧɢ
&
ɡɧɚɱɟɧɢɟ
ɜɪɟɦɟɧɢ ɠɢɡɧɢ
L
&
ɫɟɚɧɫɨɜɵɣ ɤɥɸɱ
K
&
ɢɦɹ ɩɨɥɶɡɨɜɚɬɟɥɹ
B
ɢ ɲɢɮɪɭɟɬ
ɟɝɨ ɫ ɩɨɦɨɳɶɸ ɤɥɸɱɚ
&
ɨɛɳɟɝɨ ɞɥɹ ɩɨɥɶɡɨɜɚɬɟɥɟɣ
T
ɢ
A
(
Ɉɛɚ ɡɚɲɢɮɪɨ
'
ɜɚɧɧɵɯ ɫɨɨɛɳɟɧɢɹ ɩɨɥɶɡɨɜɚɬɟɥɶ
T
ɩɨɫɵɥɚɟɬ ɩɨɥɶɡɨɜɚɬɟɥɸ
A
4
)
%
(
8
, L,
/
,
;
)
,
)
B
(
T, L, K,
%
)
.
-(
ɉɨɥɶɡɨɜɚɬɟɥɶ
A
ɝɟɧɟɪɢɪɭɟɬ ɫɨɨɛɳɟɧɢɟ
&
ɫɨɫɬɨɹɳɟɟ ɢɡ ɟɝɨ ɢɦɟɧɢ
ɢ ɦɟɬɤɢ ɜɪɟɦɟɧɢ
&
ɲɢɮɪɭɟɬ ɫɨɨɛɳɟɧɢɟ ɫ ɩɨɦɨɳɶɸ ɫɟɚɧɫɨɜɨɝɨ ɤɥɸɱɚ
K
ɢ ɩɨɫɵɥɚɟɬ ɩɨɥɶɡɨɜɚɬɟɥɸ
B
(
Ʉɪɨɦɟ ɬɨɝɨ
&
ɩɨɥɶɡɨɜɚɬɟɥɶ
A
ɨɬɩɪɚɜɥɹɟɬ
CMMH *,-0'-3--(
ȼɟɫɬɧɢɤ ɆȽɌɍ ɢɦ
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ɇ
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ɗ
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Ȼɚɭɦɚɧɚ
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ɋɟɪ
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ɉɪɢɛɨɪɨɫɬɪɨɟɧɢɟ
( ,**/(
ʋ
+ /-
1 3,4,5,6,7,8,9,10,11
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