Home » Archimedes archive » Micro User » MU 1992-08.adf » ArcFSExtra » Documents/Encryption
Documents/Encryption
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Archimedes archive » Micro User » MU 1992-08.adf » ArcFSExtra |
| Filename: | Documents/Encryption |
| Read OK: | ✔ |
| File size: | 035D bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
Duplicates
There is 1 duplicate copy of this file in the archive:
- Archimedes archive » Micro User » MU 1992-08.adf » ArcFSExtra » Documents/Encryption
- Archimedes archive » Micro User » MU 1992-09.adf » ArcFSExtra » Documents/Encryption
File contents
ArcFS 0.50/2.00 Documentation ----------------------------- File encryption --------------- This version supports garbled files. Incorrect passwords, use of Garble for files with no encryption or trying to load garbled files having set ArcFS to load files with no encryption will result in a 'Wrong password / Data Corrupt' error. This will also occur if data in an archive becomes corrupted. For Spark compatible (old format) archives containing crunched or compressed files which are encoded, all files of these formats must be encoded with passwords that have the same first letter. Encryption must be set with at least the first letter of the password(s) before opening the archive (otherwise the above error will occur). This is because ArcFS must be able to decode the first byte of the data for these files to find out the no. of bits of compression.
00000000 41 72 63 46 53 20 30 2e 35 30 2f 32 2e 30 30 20 |ArcFS 0.50/2.00 | 00000010 44 6f 63 75 6d 65 6e 74 61 74 69 6f 6e 0a 2d 2d |Documentation.--| 00000020 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------| 00000030 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 0a 0a 46 69 6c |-----------..Fil| 00000040 65 20 65 6e 63 72 79 70 74 69 6f 6e 0a 2d 2d 2d |e encryption.---| 00000050 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 0a 0a 54 68 |------------..Th| 00000060 69 73 20 76 65 72 73 69 6f 6e 20 73 75 70 70 6f |is version suppo| 00000070 72 74 73 20 67 61 72 62 6c 65 64 20 66 69 6c 65 |rts garbled file| 00000080 73 2e 20 49 6e 63 6f 72 72 65 63 74 20 70 61 73 |s. Incorrect pas| 00000090 73 77 6f 72 64 73 2c 20 75 73 65 20 6f 66 20 47 |swords, use of G| 000000a0 61 72 62 6c 65 20 66 6f 72 0a 66 69 6c 65 73 20 |arble for.files | 000000b0 77 69 74 68 20 6e 6f 20 65 6e 63 72 79 70 74 69 |with no encrypti| 000000c0 6f 6e 20 6f 72 20 74 72 79 69 6e 67 20 74 6f 20 |on or trying to | 000000d0 6c 6f 61 64 20 67 61 72 62 6c 65 64 20 66 69 6c |load garbled fil| 000000e0 65 73 20 68 61 76 69 6e 67 20 73 65 74 20 41 72 |es having set Ar| 000000f0 63 46 53 20 74 6f 0a 6c 6f 61 64 20 66 69 6c 65 |cFS to.load file| 00000100 73 20 77 69 74 68 20 6e 6f 20 65 6e 63 72 79 70 |s with no encryp| 00000110 74 69 6f 6e 20 77 69 6c 6c 20 72 65 73 75 6c 74 |tion will result| 00000120 20 69 6e 20 61 20 27 57 72 6f 6e 67 20 70 61 73 | in a 'Wrong pas| 00000130 73 77 6f 72 64 20 2f 20 44 61 74 61 0a 43 6f 72 |sword / Data.Cor| 00000140 72 75 70 74 27 20 65 72 72 6f 72 2e 20 54 68 69 |rupt' error. Thi| 00000150 73 20 77 69 6c 6c 20 61 6c 73 6f 20 6f 63 63 75 |s will also occu| 00000160 72 20 69 66 20 64 61 74 61 20 69 6e 20 61 6e 20 |r if data in an | 00000170 61 72 63 68 69 76 65 20 62 65 63 6f 6d 65 73 0a |archive becomes.| 00000180 63 6f 72 72 75 70 74 65 64 2e 0a 0a 46 6f 72 20 |corrupted...For | 00000190 53 70 61 72 6b 20 63 6f 6d 70 61 74 69 62 6c 65 |Spark compatible| 000001a0 20 28 6f 6c 64 20 66 6f 72 6d 61 74 29 20 61 72 | (old format) ar| 000001b0 63 68 69 76 65 73 20 63 6f 6e 74 61 69 6e 69 6e |chives containin| 000001c0 67 20 63 72 75 6e 63 68 65 64 20 6f 72 20 63 6f |g crunched or co| 000001d0 6d 70 72 65 73 73 65 64 0a 66 69 6c 65 73 20 77 |mpressed.files w| 000001e0 68 69 63 68 20 61 72 65 20 65 6e 63 6f 64 65 64 |hich are encoded| 000001f0 2c 20 61 6c 6c 20 66 69 6c 65 73 20 6f 66 20 74 |, all files of t| 00000200 68 65 73 65 20 66 6f 72 6d 61 74 73 20 6d 75 73 |hese formats mus| 00000210 74 20 62 65 20 65 6e 63 6f 64 65 64 20 77 69 74 |t be encoded wit| 00000220 68 0a 70 61 73 73 77 6f 72 64 73 20 74 68 61 74 |h.passwords that| 00000230 20 68 61 76 65 20 74 68 65 20 73 61 6d 65 20 66 | have the same f| 00000240 69 72 73 74 20 6c 65 74 74 65 72 2e 20 45 6e 63 |irst letter. Enc| 00000250 72 79 70 74 69 6f 6e 20 6d 75 73 74 20 62 65 20 |ryption must be | 00000260 73 65 74 20 77 69 74 68 20 61 74 0a 6c 65 61 73 |set with at.leas| 00000270 74 20 74 68 65 20 66 69 72 73 74 20 6c 65 74 74 |t the first lett| 00000280 65 72 20 6f 66 20 74 68 65 20 70 61 73 73 77 6f |er of the passwo| 00000290 72 64 28 73 29 20 62 65 66 6f 72 65 20 6f 70 65 |rd(s) before ope| 000002a0 6e 69 6e 67 20 74 68 65 20 61 72 63 68 69 76 65 |ning the archive| 000002b0 0a 28 6f 74 68 65 72 77 69 73 65 20 74 68 65 20 |.(otherwise the | 000002c0 61 62 6f 76 65 20 65 72 72 6f 72 20 77 69 6c 6c |above error will| 000002d0 20 6f 63 63 75 72 29 2e 20 54 68 69 73 20 69 73 | occur). This is| 000002e0 20 62 65 63 61 75 73 65 20 41 72 63 46 53 20 6d | because ArcFS m| 000002f0 75 73 74 20 62 65 20 61 62 6c 65 0a 74 6f 20 64 |ust be able.to d| 00000300 65 63 6f 64 65 20 74 68 65 20 66 69 72 73 74 20 |ecode the first | 00000310 62 79 74 65 20 6f 66 20 74 68 65 20 64 61 74 61 |byte of the data| 00000320 20 66 6f 72 20 74 68 65 73 65 20 66 69 6c 65 73 | for these files| 00000330 20 74 6f 20 66 69 6e 64 20 6f 75 74 20 74 68 65 | to find out the| 00000340 20 6e 6f 2e 20 6f 66 0a 62 69 74 73 20 6f 66 20 | no. of.bits of | 00000350 63 6f 6d 70 72 65 73 73 69 6f 6e 2e 0a |compression..| 0000035d
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