You're missing a quotation mark on line 59 of defuse.ca/src/pages/projects/online-free-computer-science-education.php

The upvote system is vulnerable to CSRF. It doesn't matter too much because the worst that can happen is someone manipulates the page rankings by making their popular web page outvote regular people.

The "Source Code" section in defuse.ca/src/pages/software/php-hash-cracker.php links to defuse/helloworld-cms instead of defuse/phphashcrack.

Quote from email:

Disassembling of 

0F 84 2C 01 00 00 

gives back 

je     0x132.

On the other hand, assembling of

je     0x132 

gives back

OF 84 2E 01 00 00.

It's probably an ambiguous instruction encoding or something like that but I don't feel like opening the Intel manuals right now 😅

From email:

Your online assembler is wonderful but is there any chance you
could support comments? (Semiconon comments) It's kind of hard to
upload large pieces of existing code which is commented on nearly
every line!

PS: Your tool has been proven to be very useful for me so far! Its simplicity is great 😄

"I thought you might like to know of a small bug re the spacing of zeroes when multiplication involves numbers with decimal points. For example, 20150000 * 3.5 yields 7 052 500 0.0, whereas the spacing of 000 should obviously be 70 525 000.0"

I didn't even realize floating point worked, might be best to just disallow it. Or fix the bug. I'll probably never get around to doing either.

A suggestion:
Add a box to allow to specify a comma-separated list of unused numbers.
These numbers will simply be skipped during random generation.

For example, if you run a contest with 10 numbers.
8 entrants enter and number 8 and 6 remain unused.

Then you could specify 1-10.
and then "6,8" as unused numbers.

The random generation could technically work like an 1-8 lottery, but if any number higher than 5 is chosen (in the above example), then 1 is added to the random output, and if the resulting number (even if no 1 was added) is higher than 7, add 1 again. (in the 7 case, 1 is added because its higher than 5, which puts it higher than 7, which causes 1 to be added again).
Basically, the translation table would be:
1->1
2->2
3->3
4->4
5->5
6->7
7->9
8->10

Some users have been confused by this.

Hello, I don't know if this is the right place for issues with the online assembler and disassembler.

When I try to assemble mov eax, 0x0123456789abcdef, it doesn't give any error and outputs this:

Assembly
Raw Hex (zero bytes in bold):

B8EFCDAB89   

String Literal:

"\xB8\xEF\xCD\xAB\x89"

Array Literal:

{ 0xB8, 0xEF, 0xCD, 0xAB, 0x89 }

Disassembly:
0:  b8 ef cd ab 89          mov    eax,0x89abcdef

It seems to me that only the last 4 bytes of the immediate are read while the rest is ignored.

I'd like to ask how the web version of assembly is made, because I want to write a simple assembly compiler

It doesn't seem to support hexadecimal numbers:

sub al, 0dfh-'a'

gives

Error: junk fh-97' after expression`

Add possibility to specify shorter times than 6 hours. For example 3 hours and 1 hour, for more quick lotteries in for example chats.

Even better, allow the organizer to write the locktime (value between 0-720) in hours instead of having a dropdown.

• Link to my twitter in the navbar is broken
• A bunch of 404 links / domains that are now placeholders. I guess run a scanning tool?
• Some pages aren't listed in the list of all pages
• Some old outdated posts have no date
• Make the upvote counter min out at zero so people can't artifically make it look like a page is super hated by everyone
• There was a link to https://defuse.ca/passwordrestrictions.htm somewhere (which now 404s, probably in the navbar or list of all pages)

Today while working on a ctf, I needed to assemble some code so I went to my favorite website for doing so: https://defuse.ca/online-x86-assembler.htm
Unless I am being hacked I think you need to update your certificate.

Would you be willing to update https://defuse.ca/inn-private-newsgroup-server-setup.htm because I cannot make it work in Docker with current versions of Debian and INN2?

% docker run debian:bookworm bash
# export DEBIAN_FRONTEND=noninteractive
# apt-get update && apt-get install -y inn2

fails with...

Setting up inn2 (2.7.1-1+deb12u1) ...
innconfval: hostname does not resolve or domain not set in inn.conf
innconfval: the FQDN of the server contains invalid characters not suitable for Message-IDs
dpkg: error processing package inn2 (--configure):
installed inn2 package post-installation script subprocess returned error exit status 1

Hello. I tryed to do a simple assembler code in your tool and after entering the example code:

SECTION .text
   GLOBAL _start
	
_start:
  MOV ecx,msg
  MOV ebx,1
  MOV eax,4
  INT 0x80
  MOV eax,1
  INT 0x80

SECTION .data
  MSG DB 'First code', 0xa

I had recieved an error:

Sorry, your input is too big or contains unsafe directives! 
The period (.) character must not appear anywhere in your source code.

Please correct the code on website to make it wotk

Add CSP headers. Implement what's currently being done with X-Frame-Options using the more-standard CSP header.

The certificate is expired and needs to be renewed.

Assemble:

call dword ptr 0x00000000

Result:

Disassembly:
0:  ff 15 00 00 00 00       call   DWORD PTR ds:0x0

Found a possible issue with stuck or biased random generation. It apparently generates lots of 5's in a row, which seems uncertainable and weird.

https://defuse.ca/trustedthirdparty.htm?drawingnum=9273
https://defuse.ca/trustedthirdparty.htm?drawingnum=9274
https://defuse.ca/trustedthirdparty.htm?drawingnum=9275
https://defuse.ca/trustedthirdparty.htm?drawingnum=9276
https://defuse.ca/trustedthirdparty.htm?drawingnum=9279

I got then told by a guy that mcrypt_create_iv() is depreciated and random_bytes() should be used.
Just a little bit strange, and hopefully it could be looked into and hopefully fixed.

Ran a bit more tests and seems to be fine, but as I said, could be worth looking into.

when i enter this assembly code :

add eax , byte ptr [abx+edi*2]

assember generates the following code

Assembly
Raw Hex (zero bytes in bold):

02047D00000000

String Literal:

"\x02\x04\x7D\x00\x00\x00\x00"

Array Literal:

{ 0x02, 0x04, 0x7D, 0x00, 0x00, 0x00, 0x00 }

Disassembly:
0: 02 04 7d 00 00 00 00 add al,BYTE PTR [edi*2+0x0]

From email: "It would be nice if when you display the answer, you also displayed a floating point approximation in scientific notation. A factorial operation (e.g. 25!) would also be extremely useful."

Thanks to the person who emailed me this:

(This would be a bug in the upstream disassembler if true, I haven't checked yet).