DES
. ϳ . , .
, .
-, 䳿 , , .
-, , . , .
.
, . , , 쳺, . , , ASCII.
7- .
ASCII . 5.4.
5.4.
˳ | ˳ | ||
A | N | ||
B | O | ||
C | P | ||
D | Q | ||
E | R | ||
F | S | ||
G | T | ||
H | U | ||
I | V | ||
J | W | ||
K | X | ||
L | Y | ||
M | Z |
1 26 , 1 , () .
- , , (, ).
, , HELLO ASCII . , 5.4 HELLO :
10010001000101100110010011001001111.
, , .
.
, HELLO, , , 1 0 .
ᒺ :
³ = 1001000 1000101 1001100 1001100 1001111.
= 1001101 1001100 1000101 1000101 1000110.
|
|
, LEEF.
, , . :
³ = 1001000 1000101 1001100 1001100 1001111.
= 1010000 1000110 1010100 1010100 1010111.
MFTTW.
, , .
, .
, , .
, 䳺 , , Δ .
DAVID, ASCII , ( ), HELLO. , :
1 + 1 = 0; 1 + 0 = 1; 0 + 0 = 0
³ = 1001000 1000101 1001100 1001100 1001111.
= 1000100 1000001 1010110 1001001 1000100.
= 0001100 0000100 0011010 0000101 0001011.
, , 5.4.
. , DES. 28147-89.
64 . 32 , , , , .
ֳ . . 16 . .
. , .
. , , , 56 .
. ³ 10 70- . ֳ , .