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Forums > C64 Coding > Need a protection for a onefilter for a birthday intro
2021-08-24 15:45
Dano

Registered: Jul 2004
Posts: 210
Need a protection for a onefilter for a birthday intro

Hey guys,

I'm currently coding on a little birthday intro for an old cracker who turns a certain round figure on friday.

It's just something small and a one-filer (intro).

As a little challenge i would love to protect it somehow before giving it to him. Just to make it a little harder for him to see it. :)

I guess some sort of password protection will be the only feasable thing?

Someone who could provide me with something neat? :)
 
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2021-08-24 17:39
Krill

Registered: Apr 2002
Posts: 2033
Quoting Dano
I could be an arse and pack the file with some level-packer from back in the days. Though i then would need to add a loader for fairness. Or no? :D
Probably. :)

But when handing out a disk image, you could also make it G64 and invalidate all relevant block checksums (while leaving the data intact).
2021-08-24 18:07
tlr

Registered: Sep 2003
Posts: 1481
Quote: Quoting Dano
I could be an arse and pack the file with some level-packer from back in the days. Though i then would need to add a loader for fairness. Or no? :D
Probably. :)

But when handing out a disk image, you could also make it G64 and invalidate all relevant block checksums (while leaving the data intact).


or a .d64 made from a .g64 that was formatted with one id and then had the ID in the BAM block changed. :)
(and have the program check the block id's against the expected formatted ID's.)

I guess that is sort of the same result, but if the program sets the expected ID with an M-W -> $12/$13 there is at least a clue the ID should be different globally. (which can easily be fixed in a .d64)

EDIT: but then it can really be a one-filer. Needs a loader at least.
2021-08-24 18:16
Krill

Registered: Apr 2002
Posts: 2033
Quoting tlr
or a .d64 made from a .g64 that was formatted with one id and then had the ID in the BAM block changed. :)
(and have the program check the block id's against the expected formatted ID's.)
All block IDs in a .d64 will simply be identical to the directory's header ID, though. So all block IDs will be lost when down-converting g64 to d64.
2021-08-24 18:29
tlr

Registered: Sep 2003
Posts: 1481
Quote: Quoting tlr
or a .d64 made from a .g64 that was formatted with one id and then had the ID in the BAM block changed. :)
(and have the program check the block id's against the expected formatted ID's.)
All block IDs in a .d64 will simply be identical to the directory's header ID, though. So all block IDs will be lost when down-converting g64 to d64.


That was the point. The .g64 need not exist other than as a hypotetical disk that needs to be recreated in order to run the program.
2021-08-24 18:57
Count Zero

Registered: Jan 2003
Posts: 1435
Could think of quite a few sane and insane things - somehow though also depends on the presentation if the cracker actually picks up the challenge, no?

Would you just pass him a disk/tape and tell him to enjoy? Or want to trigger him with a booter program or sumthing alike?
Ask to unprotect the working demo for inet upload (resulting in a freeze crack)? :)
2021-08-24 19:06
Dano

Registered: Jul 2004
Posts: 210
Quote: Could think of quite a few sane and insane things - somehow though also depends on the presentation if the cracker actually picks up the challenge, no?

Would you just pass him a disk/tape and tell him to enjoy? Or want to trigger him with a booter program or sumthing alike?
Ask to unprotect the working demo for inet upload (resulting in a freeze crack)? :)


Guess i will upload the unprotected file here at csdb for you folks to enjoy.

Could add the protected one for funsies then.

But the cracker should have to do something to get his ass cracking again as he tends to postpone it all the time because of #reasons.

But yeah, the protected disc/file. :)
2021-08-25 07:09
Dr.Science

Registered: Oct 2011
Posts: 36
Wasn’t there a program called Copshocker or so? You could password protect your files or so - and can’t really remember how it encrypted the file. Also not sure how hard it is to find the password, It is all so long ago... πŸ˜€
2021-08-25 07:46
hedning

Registered: Mar 2009
Posts: 3394
Quote: Wasn’t there a program called Copshocker or so? You could password protect your files or so - and can’t really remember how it encrypted the file. Also not sure how hard it is to find the password, It is all so long ago... πŸ˜€

Cop Shocker V1.2.
2021-08-25 23:00
chancer

Registered: Apr 2003
Posts: 302
I was more surprised they had come back in recent times
2021-08-25 23:00
Comos

Registered: May 2004
Posts: 55
Quote: Wasn’t there a program called Copshocker or so? You could password protect your files or so - and can’t really remember how it encrypted the file. Also not sure how hard it is to find the password, It is all so long ago... πŸ˜€

as a password protection I remember also this one :)

Antilamer Coder V1.0
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