42.zip bomb

[pierre]

Hello,

I was trying to make a 42.zip bomb which is a :

" A file that is only 42,374 bytes (42KB). When unzipped it becomes 4,503,599,626,321,920 bytes (4.5 Peta Bytes)!!! "

Me I can only achieve a 1Mb zip file that almost contain 1Gb txt file:

$ zip bomb.zip bomb_1G.txt

  adding: bomb_1G.txt (deflated 100%)

$ du -h bomb.zip

948K            bomb.zip

$ zipinfo bomb.zip

Archive:  bomb.zip

Zip file size: 970656 bytes, number of entries: 1

-rw-r--r--  3.0 unx 1000000000 tx defN 18-Jun-21 06:12 bomb_1G.txt

1 file, 1000000000 bytes uncompressed, 970484 bytes compressed:  99.9%

Do you know how I could achieve a better "bomb" with less space ?

Regards

[digininja]

The easiest way would be to grab a copy of 42.zip and have a look how it is made:

http://www.unforgettable.dk/

[pierre]

$ zipinfo 42.zip
Archive:  42.zip
Zip file size: 42838 bytes, number of entries: 16
-rw-a--     6.3 fat    34902 Bx u099 00-Mar-28 21:40 lib 0.zip
-rw-a--     6.3 fat    34902 Bx u099 00-Mar-28 21:40 lib 1.zip
-rw-a--     6.3 fat    34902 Bx u099 00-Mar-28 21:40 lib 2.zip
-rw-a--     6.3 fat    34902 Bx u099 00-Mar-28 21:40 lib 3.zip
-rw-a--     6.3 fat    34902 Bx u099 00-Mar-28 21:40 lib 4.zip
-rw-a--     6.3 fat    34902 Bx u099 00-Mar-28 21:40 lib 5.zip
-rw-a--     6.3 fat    34902 Bx u099 00-Mar-28 21:40 lib 6.zip
-rw-a--     6.3 fat    34902 Bx u099 00-Mar-28 21:40 lib 7.zip
-rw-a--     6.3 fat    34902 Bx u099 00-Mar-28 21:40 lib 8.zip
-rw-a--     6.3 fat    34902 Bx u099 00-Mar-28 21:40 lib 9.zip
-rw-a--     6.3 fat    34902 Bx u099 00-Mar-28 21:40 lib a.zip
-rw-a--     6.3 fat    34902 Bx u099 00-Mar-28 21:40 lib b.zip
-rw-a--     6.3 fat    34902 Bx u099 00-Mar-28 21:40 lib c.zip
-rw-a--     6.3 fat    34902 Bx u099 00-Mar-28 21:40 lib d.zip
-rw-a--     6.3 fat    34902 Bx u099 00-Mar-28 21:40 lib e.zip
-rw-a--     6.3 fat    34902 Bx u099 00-Mar-28 21:40 lib f.zip
16 files, 558432 bytes uncompressed, 40192 bytes compressed:  92.8%

I don't think I can go deeper without any extraction..

[digininja]

extract a single file

[Dave-ee Jones]

12 hours ago, pierre said:

" A file that is only 42,374 bytes (42KB). When unzipped it becomes 4,503,599,626,321,920 bytes (4.5 Peta Bytes)!!! "

FYI..

1 PB = 1024 TB

1 TB = 1024 GB

1 GB = 1024 MB

1 MB = 1024 KB

1 KB = 1024 B

Therefore 4.5 PB = 4.5 * 1024 TB = 4.5 * 1024 * 1024 GB = 4.5 * 1024 * 1024 * 1024 MB = 4.5 * 1024 * 1024 * 1024 * 1024 KB = 4.5 * 1024 * 1024 * 1024 * 1024 * 1024 B 
= 5,066,549,580,791,800 B
= 5.0665496e+15 B

Therefore, 4.5 PB =5,066,549,580,791,800 B.

Qwik maf.

Don't worry - you were only ~500 trillion Bytes out (I think). ?

Edited June 22, 2018 by Dave-ee Jones

[pierre]

Haha it will crash out my computer for sure if I do an extract !

Futhermore I might understand that there is 16 layers of zip files, each ones containing zip files and so on..

But still don't know how they manage to only have a 42 Kb zip file whereas me who nearly have a 1 Mb zip file that only contains 1 Gb.....

Edited June 22, 2018 by pierre

[digininja]

It is only a problem if you do a recursive decompress. Pick a single file and just pull that out, that will be a compressed file. Repeat the process. If you are worried about crashing the computer, create a fixed size drive and mount that so it can't escape beyond it and kill things.