#md5sum

J'ai cherché un moment un truc natif pour vérifier les archives que je téléchargeais et qui proposaient un hash de vérification.

La solution : certutil.exe

Tout simplement dans un terminal :

certutil.exe -hashfile .archive.tgz ALGO

Algorithmes de hachage disponibles : MD2 MD4 MD5 SHA1 SHA256 SHA384 SHA512

Par exemple :

PS C:\Users\USER> certutil.exe -hashfile .\Downloads\visualgps-refactor.tgz SHA256 Hachage SHA256 de .\Downloads\visualgps-refactor.tgz : 3b6d3fe6d7d9f9e7d61f1b65c6467db81c294b6847527685f069012e9fa0ba5e CertUtil: -hashfile La commande s’est terminée correctement. PS C:\Users\USER>

Pour en savoir plus : - certutil.exe -? - certutil.exe -v -?

Comparing contents of files on server versus key values recorded elsewhere. There is a tool called md5deep which allows recursion into directories, but I prefer to script around the GNU coreutils md5sum or some other more publicly vetted library.

Using GNU coreutils we can obtain md5sums of keys (or other arbitrary text simply). One point to watch out for are whether there are hidden newlines or carriage returns on either side. Also the format differs for binary versus text if we use the -c (check) flag.

echo "blahblahblah" > md5sum

8c3c1a60b5c10f3faacd15ae3b1db6fb -

cat blahtext.txt blahblahblah

md5sum blahtext.txt 8c3c1a60b5c10f3faacd15ae3b1db6fb blahtext.txt

Everything about the uses of MD5 sums on Internet

Today, we will talk about the widely used encryption algorithm, MD5 and its most common uses on Internet. MD5 stands for Message Digest version 5. This algorithms take any file or text and convert it to 32 character hexadecimal value like this: 891f79816b4d19042faab26d670f4f77 . This 32-character value is very specific and will produce a completely different digest even if single byte of data or…

Apache Server Hardening: Part Two

After you’ve patched and hardened your OS, you’ll need to accomplish a couple quick tasks prior to obtaining, compiling and installing the Apache software. A critical part of installing Apache is to provide a user account and group that will run the web server. It is important that the user and group you select to be unique and unprivileged to reduce exposure to attack.

It is important not to run…

ファイルが同一かは md5sum, sha1sum コマンドなどで得られるチェックサムが同一かどうかで調べることができる。

$ touch test $ md5sum test d41d8cd98f00b204e9800998ecf8427e test $ sha1sum test da39a3ee5e6b4b0d3255bfef95601890afd80709 test

コピーしたファイルは同一なのでチェックサムも同じになる。

Setelah mendownload file .iso (atau mungkin file apapun) pastikan untuk mengecek bahwa file yang kita download sudah sempurna/tidak corrupt. Biasanya file-file tersebut menyertakan kode MD5SUM-nya di link downloadnya. contoh:

Untuk mengecek MD5SUM di Ubuntu/Linux cukup melalui terminal. Caranya, masuk ke folder yang berisi file .iso tersebut kemudian ketik

md5sum nama_file.iso

Setelah menunggu beberapa saat akan muncul kode hasil cek md5sum. contoh: