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MacOS 8.1

Win98

DOS

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+--------+-------------------------+-------------------------+--------+--------+
|00000000| 41 72 63 68 69 76 65 00 | 90 00 00 00 f0 00 00 00 |Archive.|........|
|00000010| 28 00 00 00 64 00 00 00 | 00 00 00 00 00 00 00 00 |(...d...|........|
|00000020| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000030| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000040| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000050| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000060| 82 44 65 6d 6f 00 00 00 | 00 00 00 00 04 05 00 00 |.Demo...|........|
|00000070| 45 fb ff ff af db cf de | 03 00 b2 3b 04 05 00 00 |E.......|...;....|
|00000080| 24 00 00 00 82 52 65 76 | 00 00 00 00 00 00 00 00 |$....Rev|........|
|00000090| a9 04 00 00 45 fb ff ff | 1c 9e cf de 03 00 66 c5 |....E...|......f.|
|000000a0| a9 04 00 00 4c 05 00 00 | 82 52 65 76 65 72 73 65 |....L...|.Reverse|
|000000b0| 00 00 00 00 c2 0f 00 00 | 46 ff ff ff 54 0b ec 4c |........|F...T..L|
|000000c0| 03 00 80 e1 c2 0f 00 00 | 19 0a 00 00 00 00 00 00 |........|........|
|000000d0| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|000000e0| 00 00 00 00 00 00 00 00 | 00 00 00 00 64 02 00 00 |........|....d...|
|000000f0| 46 69 6c 65 44 61 74 61 | 82 44 65 6d 6f 00 00 00 |FileData|.Demo...|
|00000100| 00 00 00 00 04 05 00 00 | 45 fb ff ff af db cf de |........|E.......|
|00000110| 03 00 b2 3b 0d 00 0a 0e | f2 74 72 61 70 5f 69 6e |...;....|.trap_in|
|00000120| 69 74 0d 00 14 05 3a 0d | 00 1e 1d f5 3a e8 20 22 |it....:.|....:. "|
|00000130| 53 74 72 69 6e 67 20 3a | 22 61 24 3a fd 20 61 24 |String :|"a$:. a$|
|00000140| 3c 3e 22 22 0d 00 28 18 | 65 6e 24 3d a4 74 72 61 |<>""..(.|en$=.tra|
|00000150| 70 5f 65 6e 63 6f 64 65 | 28 61 24 29 0d 00 32 15 |p_encode|(a$)..2.|
|00000160| f1 20 22 45 6e 63 6f 64 | 65 64 3a 20 22 2b 65 6e |. "Encod|ed: "+en|
|00000170| 24 0d 00 3c 05 e0 0d 00 | 46 05 3a 0d 00 50 10 dd |$..<....|F.:..P..|
|00000180| 20 f2 74 72 61 70 5f 69 | 6e 69 74 0d 00 5a 0c de | .trap_i|nit..Z..|
|00000190| 20 71 25 20 31 30 30 0d | 00 64 08 f2 61 73 73 0d | q% 100.|.d..ass.|
|000001a0| 00 6e 05 e1 0d 00 78 05 | 3a 0d 00 82 16 dd 20 a4 |.n....x.|:..... .|
|000001b0| 74 72 61 70 5f 65 6e 63 | 6f 64 65 28 73 24 29 0d |trap_enc|ode(s$).|
|000001c0| 00 8c 15 65 6f 72 25 3d | a4 73 65 65 64 28 2d a4 |...eor%=|.seed(-.|
|000001d0| 63 72 63 29 0d 00 96 10 | e3 20 69 25 3d 31 20 b8 |crc)....|. i%=1 .|
|000001e0| 20 a9 73 24 0d 00 a0 1c | 72 25 3d a4 73 65 65 64 | .s$....|r%=.seed|
|000001f0| 28 2d a4 63 72 63 29 3a | 72 25 3d a4 72 61 6e 64 |(-.crc):|r%=.rand|
|00000200| 0d 00 aa 14 72 25 3d 72 | 25 20 80 20 28 72 25 3e |....r%=r|% . (r%>|
|00000210| 3e 31 36 29 0d 00 b4 05 | 3a 0d 00 be 13 63 25 3d |>16)....|:....c%=|
|00000220| 97 28 c1 73 24 2c 69 25 | 2c 31 29 29 0d 00 c8 1f |.(.s$,i%|,1))....|
|00000230| 73 68 25 3d 72 25 20 80 | 20 32 35 35 3a 65 25 3d |sh%=r% .| 255:e%=|
|00000240| 28 72 25 3e 3e 39 29 20 | 80 20 31 0d 00 d2 31 e7 |(r%>>9) |. 1...1.|
|00000250| 20 65 25 3d 30 20 8c 20 | 63 25 3d 63 25 20 80 20 | e%=0 . |c%=c% . |
|00000260| ac 28 31 3c 3c 73 68 25 | 29 20 8b 20 63 25 3d 63 |.(1<<sh%|) . c%=c|
|00000270| 25 20 84 20 28 31 3c 3c | 73 68 25 29 0d 00 dc 1c |% . (1<<|sh%)....|
|00000280| 63 25 3d 63 25 20 82 20 | 65 6f 72 25 3a 63 25 3d |c%=c% . |eor%:c%=|
|00000290| 63 25 20 80 20 32 35 35 | 0d 00 e6 34 e7 20 63 25 |c% . 255|...4. c%|
|000002a0| 3c 33 32 20 63 25 2b 3d | 33 32 3a f4 20 72 65 6d |<32 c%+=|32:. rem|
|000002b0| 6f 76 65 20 6c 6f 77 65 | 73 74 20 62 69 74 73 20 |ove lowe|st bits |
|000002c0| 73 6f 20 70 72 69 6e 74 | 61 62 6c 65 0d 00 f0 11 |so print|able....|
|000002d0| c1 73 24 2c 69 25 2c 31 | 29 3d bd 63 25 0d 00 fa |.s$,i%,1|)=.c%...|
|000002e0| 05 ed 0d 01 04 07 3d 73 | 24 0d 01 0e 05 3a 0d 01 |......=s|$....:..|
|000002f0| 18 0a dd 20 a4 63 72 63 | 0d 01 22 0a 24 71 25 3d |... .crc|..".$q%=|
|00000300| 73 24 0d 01 2c 24 c8 99 | 20 22 4f 53 5f 43 52 43 |s$..,$..| "OS_CRC|
|00000310| 22 2c 30 2c 71 25 2c 71 | 25 2b a9 73 24 2c 31 20 |",0,q%,q|%+.s$,1 |
|00000320| b8 20 63 72 63 25 0d 01 | 36 09 3d 63 72 63 25 0d |. crc%..|6.=crc%.|
|00000330| 01 40 05 3a 0d 01 4a 0a | dd 20 f2 61 73 73 0d 01 |.@.:..J.|. .ass..|
|00000340| 54 10 de 20 63 6f 64 65 | 25 20 31 30 30 30 0d 01 |T.. code|% 1000..|
|00000350| 5e 17 73 70 3d 31 33 3a | 6c 69 6e 6b 3d 31 34 3a |^.sp=13:|link=14:|
|00000360| 70 63 3d 31 35 0d 01 68 | 15 e3 20 70 61 73 73 25 |pc=15..h|.. pass%|
|00000370| 3d 30 20 b8 20 32 20 88 | 20 32 0d 01 72 0c 50 25 |=0 . 2 .| 2..r.P%|
|00000380| 3d 63 6f 64 65 25 0d 01 | 7c 0e 5b 4f 50 54 20 70 |=code%..||.[OPT p|
|00000390| 61 73 73 25 0d 01 86 0b | 2e 72 61 6e 64 6f 6d 0d |ass%....|.random.|
|000003a0| 01 90 21 20 53 54 4d 46 | 44 20 20 20 20 28 73 70 |..! STMF|D    (sp|
|000003b0| 29 21 2c 7b 52 31 2d 52 | 31 32 2c 6c 69 6e 6b 7d |)!,{R1-R|12,link}|
|000003c0| 0d 01 9a 13 20 43 4d 50 | 20 20 20 20 20 20 52 30 |.... CMP|      R0|
|000003d0| 2c 23 30 0d 01 a4 16 3b | 20 53 54 52 4e 45 20 20 |,#0....;| STRNE  |
|000003e0| 20 20 52 30 2c 73 65 65 | 64 0d 01 ae 15 20 4c 44 |  R0,see|d.... LD|
|000003f0| 52 20 20 20 20 20 20 52 | 30 2c 73 65 65 64 0d 01 |R      R|0,seed..|
|00000400| b8 13 20 4c 44 52 20 20 | 20 20 20 20 52 31 2c 63 |.. LDR  |    R1,c|
|00000410| 31 0d 01 c2 13 20 4c 44 | 52 20 20 20 20 20 20 52 |1.... LD|R      R|
|00000420| 32 2c 63 32 0d 01 cc 19 | 20 4d 4c 41 20 20 20 20 |2,c2....| MLA    |
|00000430| 20 20 52 30 2c 52 31 2c | 52 30 2c 52 32 0d 01 d6 |  R0,R1,|R0,R2...|
|00000440| 19 20 4d 4c 41 20 20 20 | 20 20 20 52 33 2c 52 31 |. MLA   |   R3,R1|
|00000450| 2c 52 30 2c 52 32 0d 01 | e0 15 20 53 54 52 20 20 |,R0,R2..|.. STR  |
|00000460| 20 20 20 20 52 33 2c 73 | 65 65 64 0d 01 ea 1c 20 |    R3,s|eed.... |
|00000470| 82 20 20 20 20 20 20 52 | 30 2c 52 30 2c 52 33 2c |.      R|0,R0,R3,|
|00000480| 52 4f 52 20 23 31 36 0d | 01 f4 20 20 4c 44 4d 46 |ROR #16.|..  LDMF|
|00000490| 44 20 20 20 20 28 73 70 | 29 21 2c 7b 52 31 2d 52 |D    (sp|)!,{R1-R|
|000004a0| 31 32 2c 70 63 7d 5e 0d | 01 fe 10 2e 72 61 6e 64 |12,pc}^.|....rand|
|000004b0| 6f 6d 5f 73 65 65 64 0d | 02 08 10 2e 72 61 6e 64 |om_seed.|....rand|
|000004c0| 6f 6d 5f 69 6e 69 74 0d | 02 12 21 20 53 54 4d 46 |om_init.|..! STMF|
|000004d0| 44 20 20 20 20 28 73 70 | 29 21 2c 7b 52 31 2d 52 |D    (sp|)!,{R1-R|
|000004e0| 31 32 2c 6c 69 6e 6b 7d | 0d 02 1c 13 20 43 4d 50 |12,link}|.... CMP|
|000004f0| 20 20 20 20 20 20 52 30 | 2c 23 31 0d 02 26 23 3b |      R0|,#1..&#;|
|00000500| 20 53 57 49 45 51 20 20 | 20 20 4f 53 5f 52 65 61 | SWIEQ  |  OS_Rea|
|00000510| 64 4d 6f 6e 6f 74 6f 6e | 69 63 54 69 6d 65 0d 02 |dMonoton|icTime..|
|00000520| 30 15 20 53 54 52 20 20 | 20 20 20 20 52 30 2c 73 |0. STR  |    R0,s|
|00000530| 65 65 64 0d 02 3a 20 20 | 4c 44 4d 46 44 20 20 20 |eed..:  |LDMFD   |
|00000540| 20 28 73 70 29 21 2c 7b | 52 31 2d 52 31 32 2c 70 | (sp)!,{|R1-R12,p|
|00000550| 63 7d 5e 0d 02 44 1a 2e | 63 31 20 20 20 20 20 20 |c}^..D..|c1      |
|00000560| 20 45 51 55 44 20 31 36 | 36 34 35 32 35 0d 02 4e | EQUD 16|64525..N|
|00000570| 1c 2e 63 32 20 20 20 20 | 20 20 20 45 51 55 44 20 |..c2    |   EQUD |
|00000580| 39 30 37 36 33 33 33 39 | 33 0d 02 58 14 2e 73 65 |90763339|3..X..se|
|00000590| 65 64 20 20 20 20 20 45 | 51 55 44 20 30 0d 02 62 |ed     E|QUD 0..b|
|000005a0| 05 5d 0d 02 6c 05 ed 0d | 02 76 19 41 25 3d 31 30 |.]..l...|.v.A%=10|
|000005b0| 30 30 3a d6 20 72 61 6e | 64 6f 6d 5f 69 6e 69 74 |00:. ran|dom_init|
|000005c0| 0d 02 80 05 e1 0d 02 8a | 05 3a 0d 02 94 0f dd 20 |........|.:..... |
|000005d0| a4 73 65 65 64 28 41 25 | 29 0d 02 9e 11 d6 20 72 |.seed(A%|)..... r|
|000005e0| 61 6e 64 6f 6d 5f 73 65 | 65 64 0d 02 a8 0e 3d ba |andom_se|ed....=.|
|000005f0| 28 72 61 6e 64 6f 6d 29 | 0d 02 b2 05 3a 0d 02 bc |(random)|....:...|
|00000600| 0b dd 20 a4 72 61 6e 64 | 0d 02 c6 0e 3d ba 28 72 |.. .rand|....=.(r|
|00000610| 61 6e 64 6f 6d 29 0d ff | 46 69 6c 65 44 61 74 61 |andom)..|FileData|
|00000620| 82 52 65 76 00 00 00 00 | 00 00 00 00 a9 04 00 00 |.Rev....|........|
|00000630| 45 fb ff ff 1c 9e cf de | 03 00 66 c5 0d 00 0a 27 |E.......|..f....'|
|00000640| de 20 71 25 20 31 30 30 | 3a ee 85 20 85 20 30 2c |. q% 100|:.. . 0,|
|00000650| f6 24 2b 22 20 61 74 20 | 6c 69 6e 65 20 22 2b c3 |.$+" at |line "+.|
|00000660| 9e 3a e0 0d 00 14 08 f2 | 61 73 73 0d 00 1e 1c f5 |.:......|ass.....|
|00000670| 3a e8 20 22 53 74 72 69 | 6e 67 3a 20 22 73 24 3a |:. "Stri|ng: "s$:|
|00000680| fd 73 24 3c 3e 22 22 0d | 00 28 15 65 6f 72 25 3d |.s$<>"".|.(.eor%=|
|00000690| a4 73 65 65 64 28 2d a4 | 63 72 63 29 0d 00 32 10 |.seed(-.|crc)..2.|
|000006a0| e3 20 69 25 3d 31 20 b8 | 20 a9 73 24 0d 00 3c 1c |. i%=1 .| .s$..<.|
|000006b0| 72 25 3d a4 73 65 65 64 | 28 2d a4 63 72 63 29 3a |r%=.seed|(-.crc):|
|000006c0| 72 25 3d a4 72 61 6e 64 | 0d 00 46 14 72 25 3d 72 |r%=.rand|..F.r%=r|
|000006d0| 25 20 80 20 28 72 25 3e | 3e 31 36 29 0d 00 50 05 |% . (r%>|>16)..P.|
|000006e0| 3a 0d 00 5a 13 63 25 3d | 97 28 c1 73 24 2c 69 25 |:..Z.c%=|.(.s$,i%|
|000006f0| 2c 31 29 29 0d 00 64 1f | 73 68 25 3d 72 25 20 80 |,1))..d.|sh%=r% .|
|00000700| 20 32 35 35 3a 65 25 3d | 28 72 25 3e 3e 39 29 20 | 255:e%=|(r%>>9) |
|00000710| 80 20 31 0d 00 6e 31 e7 | 20 65 25 3d 30 20 8c 20 |. 1..n1.| e%=0 . |
|00000720| 63 25 3d 63 25 20 80 20 | ac 28 31 3c 3c 73 68 25 |c%=c% . |.(1<<sh%|
|00000730| 29 20 8b 20 63 25 3d 63 | 25 20 84 20 28 31 3c 3c |) . c%=c|% . (1<<|
|00000740| 73 68 25 29 0d 00 78 1c | 63 25 3d 63 25 20 82 20 |sh%)..x.|c%=c% . |
|00000750| 65 6f 72 25 3a 63 25 3d | 63 25 20 80 20 32 35 35 |eor%:c%=|c% . 255|
|00000760| 0d 00 82 34 e7 20 63 25 | 3c 33 32 20 63 25 2b 3d |...4. c%|<32 c%+=|
|00000770| 33 32 3a f4 20 72 65 6d | 6f 76 65 20 6c 6f 77 65 |32:. rem|ove lowe|
|00000780| 73 74 20 62 69 74 73 20 | 73 6f 20 70 72 69 6e 74 |st bits |so print|
|00000790| 61 62 6c 65 0d 00 8c 11 | c1 73 24 2c 69 25 2c 31 |able....|.s$,i%,1|
|000007a0| 29 3d bd 63 25 0d 00 96 | 05 ed 0d 00 a0 07 f1 73 |)=.c%...|.......s|
|000007b0| 24 0d 00 aa 05 e0 0d 00 | b4 05 3a 0d 00 be 0a dd |$.......|..:.....|
|000007c0| 20 a4 63 72 63 0d 00 c8 | 0a 24 71 25 3d 73 24 0d | .crc...|.$q%=s$.|
|000007d0| 00 d2 24 c8 99 20 22 4f | 53 5f 43 52 43 22 2c 30 |..$.. "O|S_CRC",0|
|000007e0| 2c 71 25 2c 71 25 2b a9 | 73 24 2c 31 20 b8 20 63 |,q%,q%+.|s$,1 . c|
|000007f0| 72 63 25 0d 00 dc 09 3d | 63 72 63 25 0d 00 e6 05 |rc%....=|crc%....|
|00000800| 3a 0d 00 f0 0a dd 20 f2 | 61 73 73 0d 00 fa 10 de |:..... .|ass.....|
|00000810| 20 63 6f 64 65 25 20 31 | 30 30 30 0d 01 04 17 73 | code% 1|000....s|
|00000820| 70 3d 31 33 3a 6c 69 6e | 6b 3d 31 34 3a 70 63 3d |p=13:lin|k=14:pc=|
|00000830| 31 35 0d 01 0e 15 e3 20 | 70 61 73 73 25 3d 30 20 |15..... |pass%=0 |
|00000840| b8 20 32 20 88 20 32 0d | 01 18 0c 50 25 3d 63 6f |. 2 . 2.|...P%=co|
|00000850| 64 65 25 0d 01 22 0e 5b | 4f 50 54 20 70 61 73 73 |de%..".[|OPT pass|
|00000860| 25 0d 01 2c 0b 2e 72 61 | 6e 64 6f 6d 0d 01 36 21 |%..,..ra|ndom..6!|
|00000870| 20 53 54 4d 46 44 20 20 | 20 20 28 73 70 29 21 2c | STMFD  |  (sp)!,|
|00000880| 7b 52 31 2d 52 31 32 2c | 6c 69 6e 6b 7d 0d 01 40 |{R1-R12,|link}..@|
|00000890| 13 20 43 4d 50 20 20 20 | 20 20 20 52 30 2c 23 30 |. CMP   |   R0,#0|
|000008a0| 0d 01 4a 16 3b 20 53 54 | 52 4e 45 20 20 20 20 52 |..J.; ST|RNE    R|
|000008b0| 30 2c 73 65 65 64 0d 01 | 54 15 20 4c 44 52 20 20 |0,seed..|T. LDR  |
|000008c0| 20 20 20 20 52 30 2c 73 | 65 65 64 0d 01 5e 13 20 |    R0,s|eed..^. |
|000008d0| 4c 44 52 20 20 20 20 20 | 20 52 31 2c 63 31 0d 01 |LDR     | R1,c1..|
|000008e0| 68 13 20 4c 44 52 20 20 | 20 20 20 20 52 32 2c 63 |h. LDR  |    R2,c|
|000008f0| 32 0d 01 72 19 20 4d 4c | 41 20 20 20 20 20 20 52 |2..r. ML|A      R|
|00000900| 30 2c 52 31 2c 52 30 2c | 52 32 0d 01 7c 19 20 4d |0,R1,R0,|R2..|. M|
|00000910| 4c 41 20 20 20 20 20 20 | 52 33 2c 52 31 2c 52 30 |LA      |R3,R1,R0|
|00000920| 2c 52 32 0d 01 86 15 20 | 53 54 52 20 20 20 20 20 |,R2.... |STR     |
|00000930| 20 52 33 2c 73 65 65 64 | 0d 01 90 1c 20 82 20 20 | R3,seed|.... .  |
|00000940| 20 20 20 20 52 30 2c 52 | 30 2c 52 33 2c 52 4f 52 |    R0,R|0,R3,ROR|
|00000950| 20 23 31 36 0d 01 9a 20 | 20 4c 44 4d 46 44 20 20 | #16... | LDMFD  |
|00000960| 20 20 28 73 70 29 21 2c | 7b 52 31 2d 52 31 32 2c |  (sp)!,|{R1-R12,|
|00000970| 70 63 7d 5e 0d 01 a4 10 | 2e 72 61 6e 64 6f 6d 5f |pc}^....|.random_|
|00000980| 73 65 65 64 0d 01 ae 10 | 2e 72 61 6e 64 6f 6d 5f |seed....|.random_|
|00000990| 69 6e 69 74 0d 01 b8 21 | 20 53 54 4d 46 44 20 20 |init...!| STMFD  |
|000009a0| 20 20 28 73 70 29 21 2c | 7b 52 31 2d 52 31 32 2c |  (sp)!,|{R1-R12,|
|000009b0| 6c 69 6e 6b 7d 0d 01 c2 | 13 20 43 4d 50 20 20 20 |link}...|. CMP   |
|000009c0| 20 20 20 52 30 2c 23 31 | 0d 01 cc 23 3b 20 53 57 |   R0,#1|...#; SW|
|000009d0| 49 45 51 20 20 20 20 4f | 53 5f 52 65 61 64 4d 6f |IEQ    O|S_ReadMo|
|000009e0| 6e 6f 74 6f 6e 69 63 54 | 69 6d 65 0d 01 d6 15 20 |notonicT|ime.... |
|000009f0| 53 54 52 20 20 20 20 20 | 20 52 30 2c 73 65 65 64 |STR     | R0,seed|
|00000a00| 0d 01 e0 20 20 4c 44 4d | 46 44 20 20 20 20 28 73 |...  LDM|FD    (s|
|00000a10| 70 29 21 2c 7b 52 31 2d | 52 31 32 2c 70 63 7d 5e |p)!,{R1-|R12,pc}^|
|00000a20| 0d 01 ea 1a 2e 63 31 20 | 20 20 20 20 20 20 45 51 |.....c1 |      EQ|
|00000a30| 55 44 20 31 36 36 34 35 | 32 35 0d 01 f4 1c 2e 63 |UD 16645|25.....c|
|00000a40| 32 20 20 20 20 20 20 20 | 45 51 55 44 20 39 30 37 |2       |EQUD 907|
|00000a50| 36 33 33 33 39 33 0d 01 | fe 14 2e 73 65 65 64 20 |633393..|...seed |
|00000a60| 20 20 20 20 45 51 55 44 | 20 30 0d 02 08 05 5d 0d |    EQUD| 0....].|
|00000a70| 02 12 05 ed 0d 02 1c 19 | 41 25 3d 31 30 30 30 3a |........|A%=1000:|
|00000a80| d6 20 72 61 6e 64 6f 6d | 5f 69 6e 69 74 0d 02 26 |. random|_init..&|
|00000a90| 05 e1 0d 02 30 05 3a 0d | 02 3a 0f dd 20 a4 73 65 |....0.:.|.:.. .se|
|00000aa0| 65 64 28 41 25 29 0d 02 | 44 11 d6 20 72 61 6e 64 |ed(A%)..|D.. rand|
|00000ab0| 6f 6d 5f 73 65 65 64 0d | 02 4e 0e 3d ba 28 72 61 |om_seed.|.N.=.(ra|
|00000ac0| 6e 64 6f 6d 29 0d 02 58 | 05 3a 0d 02 62 0b dd 20 |ndom)..X|.:..b.. |
|00000ad0| a4 72 61 6e 64 0d 02 6c | 0e 3d ba 28 72 61 6e 64 |.rand..l|.=.(rand|
|00000ae0| 6f 6d 29 0d ff 46 69 6c | 65 44 61 74 61 82 52 65 |om)..Fil|eData.Re|
|00000af0| 76 65 72 73 65 00 00 00 | 00 c2 0f 00 00 46 ff ff |verse...|.....F..|
|00000b00| ff 54 0b ec 4c 03 00 80 | e1 20 20 20 20 20 20 20 |.T..L...|.       |
|00000b10| 20 20 20 20 20 20 20 20 | 20 20 20 20 48 6f 77 20 |        |    How |
|00000b20| 74 6f 20 62 75 69 6c 64 | 20 61 20 73 65 63 75 72 |to build| a secur|
|00000b30| 65 20 70 61 73 73 77 6f | 72 64 20 73 79 73 74 65 |e passwo|rd syste|
|00000b40| 6d 0a 20 20 20 20 20 20 | 20 20 20 20 20 20 20 20 |m.      |        |
|00000b50| 20 20 20 20 20 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |     ---|--------|
|00000b60| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00000b70| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 0a 0a 45 73 73 65 |--------|--..Esse|
|00000b80| 6e 74 69 61 6c 6c 79 2c | 20 74 6f 20 73 65 63 75 |ntially,| to secu|
|00000b90| 72 65 6c 79 20 62 75 69 | 6c 64 20 61 20 27 74 72 |rely bui|ld a 'tr|
|00000ba0| 61 70 64 6f 6f 72 27 20 | 6d 65 63 68 61 6e 69 73 |apdoor' |mechanis|
|00000bb0| 6d 2c 20 69 65 2e 20 61 | 6e 20 61 6c 67 6f 72 69 |m, ie. a|n algori|
|00000bc0| 74 68 6d 0a 74 68 61 74 | 20 63 61 6e 6e 6f 74 20 |thm.that| cannot |
|00000bd0| 62 65 20 72 65 76 65 72 | 73 65 64 2c 20 61 74 20 |be rever|sed, at |
|00000be0| 73 6f 6d 65 20 73 74 61 | 67 65 2c 20 64 61 74 61 |some sta|ge, data|
|00000bf0| 20 6d 75 73 74 20 62 65 | 20 6c 6f 73 74 2e 0a 0a | must be| lost...|
|00000c00| 54 61 6b 65 20 61 20 63 | 6f 6d 6d 6f 6e 2c 20 61 |Take a c|ommon, a|
|00000c10| 6e 64 20 65 61 73 69 6c | 79 20 68 61 63 6b 61 62 |nd easil|y hackab|
|00000c20| 6c 65 20 61 6c 67 6f 72 | 69 74 68 6d 3a 20 65 61 |le algor|ithm: ea|
|00000c30| 63 68 20 6c 65 74 74 65 | 72 20 69 73 20 45 4f 52 |ch lette|r is EOR|
|00000c40| 27 64 20 77 69 74 68 0a | 61 20 6e 75 6d 62 65 72 |'d with.|a number|
|00000c50| 20 28 61 20 63 6f 6e 73 | 74 61 6e 74 2c 20 77 68 | (a cons|tant, wh|
|00000c60| 69 63 68 20 6d 69 67 68 | 74 2c 20 73 61 79 2c 20 |ich migh|t, say, |
|00000c70| 64 65 70 65 6e 64 20 6f | 6e 20 74 68 65 20 6c 65 |depend o|n the le|
|00000c80| 74 74 65 72 27 73 20 70 | 6f 73 69 74 69 6f 6e 0a |tter's p|osition.|
|00000c90| 69 6e 20 74 68 65 20 73 | 74 72 69 6e 67 29 2e 20 |in the s|tring). |
|00000ca0| 54 68 69 73 20 63 61 6e | 20 71 75 69 74 65 20 65 |This can| quite e|
|00000cb0| 61 73 69 6c 79 20 62 65 | 20 72 65 76 65 72 73 65 |asily be| reverse|
|00000cc0| 64 2c 20 73 69 6d 70 6c | 79 20 62 79 20 45 4f 52 |d, simpl|y by EOR|
|00000cd0| 69 6e 67 20 65 61 63 68 | 0a 6c 65 74 74 65 72 20 |ing each|.letter |
|00000ce0| 61 67 61 69 6e 2e 0a 0a | 42 75 74 20 63 6f 6e 73 |again...|But cons|
|00000cf0| 69 64 65 72 20 74 68 65 | 20 28 68 79 70 6f 74 68 |ider the| (hypoth|
|00000d00| 65 74 69 63 61 6c 29 20 | 73 69 74 75 61 74 69 6f |etical) |situatio|
|00000d10| 6e 20 77 68 65 72 65 20 | 79 6f 75 20 68 61 76 65 |n where |you have|
|00000d20| 20 61 20 74 77 6f 20 6c | 65 74 74 65 72 0a 73 74 | a two l|etter.st|
|00000d30| 72 69 6e 67 2e 20 54 68 | 65 20 66 69 72 73 74 20 |ring. Th|e first |
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