Questions tagged [md5]

a cryptographic hash function with a 128-bit (16-byte) output, now deprecated

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1answer
57 views

If site provides MD5 to check file, can't the comparison string also not be modified? [duplicate]

I am new to this so please bear with me. I was downloading a VM image and I was told to check the MD5. Naturally, I did but wondered, If a hacker would change the file to be downloaded from the ...
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1answer
58 views

MD5 PPPoE chap crack

My apartment complex uses PPPoE CHAP authentication for internet (Mikrotik router), I want to switch their provided router with my own, however they aren't willing to give me my password. I have ...
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1answer
154 views

How to find just the first character or value of a MD5 hash string

I want to know how to find just the first character or digit in first part of a 64 length string from a MD5 hash. For example, we have a hash: ...
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3answers
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John the Ripper - Can't get cracked MD5 hash to show

I'm trying to crack some MD5 hashes given in OWASP's BWA on their DVWA site. I was able to use John the Ripper and the very first time it worked fine and it showed the reversed hashes using the code: ...
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1answer
202 views

Possible to decode md5 hash of a malicious URL?

Context: I had a virus on my WordPress website server that injected itself into every functions.php file on the server across two different sites. After removing the heavily obfuscated virus code I ...
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2answers
73 views

Hash and data modification

If I have the MD5 and SHA1 hash matches for an encrypted container. Is there no possibility it's been modified? Is it safe to assume the container has never been modified?
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1answer
87 views

Finding original command result from MD5 hash

Basically I hashed the result of the "date" command with md5sum: $date | md5sum The output is indeed in the likes of: e4c94362cd4fd71ec6aca78c7411bdc3 - My question was: is it possible to recover ...
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2answers
174 views

How safe is md5sum in regards to verifying executable files?

is it possible to trick someone into running a malicious executable file instead of a real one provided by a website; assuming they will md5sum the file
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1answer
516 views

Securely displaying hidden integers with MD5

A system I'm studying uses the following mechanism: a 19-digit integer is hashed via the MD5 algorithm and the salt of the integer is shown in plain sight to the user before they take an irreversible ...
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7answers
98k views

Is MD5 considered insecure?

After all these articles circulating online about md5 exploits, I am considering switching to another hash algorithm. As far as I know it's always been the algorithm of choice among numerous DBAs. Is ...
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1answer
303 views

Tools to produce an MD5 collision?

I'd like to learn a bit more about MD5 collisions. So let's assume I have a message m: m = somesecretmessage And I hash that message: z = md5(m) The only know information is z. I do not know m. ...
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1answer
1k views

Can I crack a zip file using Hash Suite on Windows?

I'm trying to crack a password I set on a zip file using Hash Suite but it doesn't seem to work for me (not sure if I'm doing everything correctly). Basically, this is what I've done: Created a ...
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2answers
709 views

How do you manually encrypt text to an md5 hash?

I am aware that you can do something like go to md5online.org or something, but I want to know how to do it manually. For example, you might encrypt it like by taking the length of it and turning the ...
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2answers
433 views

Is it known to what message size are standard hash functions injective?

This simple Python script verifies that all messages of length 1 have different SHA-1 hashes: import hashlib s = set() for i in range(256): s.add(hashlib.sha1(chr(i)).hexdigest()) print len(s) ...
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0answers
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How long will it take to crack a hashed random string

If I generate 128 bit, 512 bit and 1024 bit random strings using either: A native rand() function (C, PHP, Python, etc) OpenSSL random bytes Hardware generated random number And hash the random ...
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If hashing is one way, why can we decrypt MD5 hashes?

I have read some times that hashing is a one way function, that is you can make the hash of a message, but you can't recover the original message from the hash, just check its integrity. However, if ...
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3answers
226 views

Disguising the type of hash used

I've read about why MD5, SHA1, and many other hashing functions are insecure, by a lot, but I'm thinking of doing a different approach. It won't increase security, I'm aware of that, but I believe it ...
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4answers
8k views

Is Postgres password-based authentication secure?

According to Postgres's documentation, Postgres's password authentication method uses MD5 hashing to secure the password: The password-based authentication methods are md5 and password. These ...
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5answers
13k views

Is it secure to use MD5 to verify the integrity of small files (less than 15kb)?

I know that collision for MD5 has been documented since the 90s and that digital certificates based off of MD5 has been demonstrated to be completely compromised back in 2010 but how effective is MD5 ...
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2answers
564 views

Is there any recommended approach for “upgrading” MD5 hashes to something secure? [duplicate]

I'm currently dealing with a couple of user accounts containing MD5 hashed passwords. These accounts got migrated from an old system into our current system which uses PBKDF2 for password hashing. I ...
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0answers
70 views

How secure is this combined sha1/md5 hash [duplicate]

Recently we outsourced some work for a website. While reviewing this code I came across the password hash function. I am in no way a security expert besides some basic knowledge (hence outsourcing ...
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0answers
121 views

Attacking a update mechanism using MD5 and RSA

I am currently working on a software challenge where you have to unlock several functions of a piece of software. The software is written in Java. One of them is the update mechanism of the firmware. ...
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6answers
25k views

Reversible Hash Function?

Is there any reversible hash function? The hash function like SHA and MD5 are not reversible. I would like to know if there exist some reversible hash functions?
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3answers
417 views

How secure is using MD5 for signature

Generally speaking, MD5 is considered as broken for secure usage these days, but I came across a signature design using MD5 many times recently in my company. The detail shows as following: T = text, ...
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1answer
2k views

Advice to help crack MD5crypt hash

I've been given a homework task to crack a particularly difficult password on a Unix system. I have found users and hashes in the etc/shadow file and cracked all but this one: $1$TyPfW4pp$...
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2answers
2k views

How long does it take to compute hashes using the MD5 hash algorithm? [closed]

1) If one iteration of MD5 takes x seconds, is it safe to assume that n iterations of MD5 takes n * x seconds? 2) Will salted and unsalted versions of md5 hash algorithms take approximately the same ...
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4answers
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Using MD5 for file integrity checks?

General Always check the MD5 hashes of the .NET Framework assemblies to prevent the possibility of rootkits in the framework. Altered assemblies are possible and simple to produce. Checking the ...
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3answers
14k views

Why do most hashing functions produce hashes that have characters a-f 0-9?

This is something I never understood about hashing functions. I know that algorithms like whirlpool and blowfish both produce outputs that don't follow this pattern, but why is it that most do? Is ...
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6answers
2k views

How likely is a collision using MD5 compared to SHA256 (for checking file integrity)?

Many sites these days offer MD5 and SHA256 hashes to check the integrity of downloaded files or archives. I wonder how much safer is the use of the SHA256 hashes for integrity checks? Note: Consider ...
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1answer
21k views

Hashcat passwordcracking separator unmatched

I have the task to crack a bunch of passwords like: $1$V5l3qvml$Q.fDn30gGhjcEIZH8utah/ $1$DcuX.dRK$bR4utyGQ4ET4sobpMMtfo0 $1$WbXWIqFu$Qu1fT/MmTIvSUz4xw4mlI0 $1$8Y7TfkZ5$LnuF99mgFbV1wvQ61dMZB1 I was ...
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2answers
6k views

Difference between OS X md5 and gnu md5sum

I have installed the "md5sum" utility on my Mac and there was also a "md5" binary pre-installed in /sbin. My problem and question is this: "Isn't MD5 a standard algorithm?" Because I get different ...
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2answers
2k views

Is it possible to crack Joomla hash password?

I'm a developer and suddenly I fall in a stupid situation like I need to crack a hash Joomla password which is (5aa154999c111bf7f33a1a3cadba5847) and I don't know the salt. is there any way to crack ...
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1answer
1k views

Brute force MD5 with a prefix and suffix up to n characters/words

I have a couple of things I would like to explore with hashcat. I have a MD5 hashed password, which I know for a fact has a prefix and a suffix. The actual password is located in the middle of the ...
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2answers
1k views

Cracking a MD5 hash from numerical input

I am trying to crack one of multiple MD5 hashes that have been created from numerical input. I have a sample of 1000 MD5 hashes that are generated from numerical input. I know that the input is ...
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2answers
4k views

Which hashing algorithm shoud I use for a safe file checksum?

For my work I'll need to provide my customer a specific file which will be the result of the work I have done for them. To protect the integrity of the work I have done and to guarantee it has never ...
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1answer
46 views

Potential security issue with md5 filename

I've been storing files using a filename of the md5 hash of the file. This allows me to not store duplicates of the same file and avoids any filename clashes. Each file has uses a different salt/iv. ...
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3answers
12k views

Why is it necessary to match the checksum of a download with another file provided by the same server? [duplicate]

Possible Duplicate: Does hashing a file from an unsigned website give a false sense of security? On many servers providing files for download, there is a file on which checksums are provided for ...
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2answers
3k views

MD5 Preimage Vulnerability in 2017

I've recently discovered that one of our (strictly internal facing - no external risk unless other systems are completely compromised) platforms is storing passwords by salting and then MD5 hashing ...
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2answers
689 views

The way to determine IV for AES encryption, possible security problems with this approach

I am trying to make a folder encryption with maximum automation (except password input). Inside a bash script I do the following: echo $RANDOM | md5sum | cut -d' ' -f1 > iv and then using it: ...
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1answer
5k views

Received “md5” in access logs

In our Apache server we have received around 200 HTTP GET requests from the same IP and a common string in each request is "md5", e.g. index.php?option=com_s5clanroster&view=s5clanroster&...
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1answer
341 views

Is it possible to tell if a file's message digest is MD5 or SHA-256?

There's some old data encrypted with OpenSSL 1.0.2, but now OpenSSL is at 1.1.0. I understand from OpenSSL FAQ USER3 that an old file can be decrypted with 1.1.0 by using -md md5. But let's say you ...
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2answers
12k views

Truncating the output of SHA256 to 128 bits

Suppose we need/prefer 128 bit hash output, for example to generate a 128 bit encryption key or, in other applications (e.g. file integrity verification), to consume less storage space. I don't know ...
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1answer
332 views

Calculating Entropy using md5sum, sha256sum etc

We can calculate the Entropy S of a string simply like this: S = L * log_2(N) Where L stands for used characters in the string And N for every possible character Example: We want to calculate the ...
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1answer
2k views

How does VTP authentication prevent unauthorized access (Can the password be cracked given captured packets)

I know that when setting up VTP across switches in a network you should set a secret/password to prevent unauthorized requests. My question is I know that this uses an MD5 hash to ensure that ...
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4answers
181k views

Is SHA1 better than MD5 only because it generates a hash of 160 bits?

It is well known that SHA1 is recommended more than MD5 for hashing since MD5 is practically broken as lot of collisions have been found. With the birthday attack, it is possible to get a collision ...
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1answer
1k views

Is it possible to find out the salt of a MD5 hash?

I want to know whether it is possible to find out the salt of a MD5 hash? For instance we've got two MD5 hashes helloworld -> fc5e038d38a57032085441e7fe7010b0 goodbyeworld -> ...
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2answers
2k views

How one can find a string whose MD5 hash has a specific prefix?

I've heard that there is a string that contains only the letters a to z whose MD5 hash begins with the hexadecimal prefix 314159265358 and the rest can be arbitrary. How can one find such a string and ...
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4answers
33k views

Why are MD5 and SHA-1 still used for checksums and certificates if they are called broken?

I was just reading about SSL/TLS stuff, and according to this site (which is rated as A by Qualys SSL Labs), MD5 is totally broken, and SHA-1 is cryptographically weak since 2005. And yet, I noticed ...
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1answer
12k views

John the ripper passwd file format with salt not working

I'm trying test password strength in one of our e-commerce sites. I'm using john the ripper to brute-force a password file. The algorithm used by PHP is: $hash = md5($salt . $pass) No other ...
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1answer
471 views

Path traversal using hash extension attack

I'm trying to write a PoC for path traversal using hash extension attack on a PHP site. My obstacle is in specifying an acceptable string. The vulnerability is in in the URL: http://127.0.0.1/...

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