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

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-7
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2answers
100 views

What is is the best way to create virus signature database? [on hold]

We are thinking to develop a new Antivirus program. The main concern is to create a virus signature database. I want to ask what is the best possible way to add viruses signature in our database to ...
1
vote
0answers
28 views

Transmitted sensitive user data

At the moment, I have set up mitmproxy and can record all HTTP/HTTPS communications between the client and server. For research purposes I am looking to find a way to detect potential leakage of ...
-1
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2answers
97 views

Decrypting a very simple key [closed]

I'm doing a basic cryptography course and a question is asking to to decipher: ...
3
votes
2answers
91 views

Are there any known MD5 hash collisions of messages of different length?

All the examples of MD5 hash collisions I've come across comprise two different messages (inputs) of the same length. The first and second messages have different values for a number of bits and the ...
5
votes
2answers
1k views

Code signing with MD5 on Windows 8

I discovered that a signed installer package that is reported as correctly signed on Windows 7 and earlier, is reported as "corrupt" in IE10 on Windows 8. Further investigation showed that the ...
23
votes
4answers
4k 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 ...
4
votes
1answer
691 views

Cracking DES(Unix)/MD5 ARP

This is a basic example of an Unix Pass Encryption. I have a little Hash of MD5 ARP: user50:$apr1$w7YNTrjQ$0/71H7ze5o9/jCnKLt0mj0 user60:$apr1$AIw2h09/$Ti0TRlU9mDpCGm5zg.ZDP. I need to find the ...
4
votes
1answer
68 views

X.509 Certificate Signature Collision Vulnerability

Customer complained that during security scan performed on our application the following was raised: 172.22.0.19 - xxxxx - IETF X.509 Certificate Signature Collision Vulnerability - ...
33
votes
4answers
3k views

Does every hash value have an inverse value?

There are many different hash functions, md5, sha, and others. They take a value V and produce a H via transformation Function(V) = H, where Function is md5, sha, etc. My question is: Does every hash ...
0
votes
1answer
40 views

Md5 vs Md4 recognition

Is there a way to actually find out whether a hash is MD5 or MD4? For instance: 10c7ccc7a4f0aff03c915c485565b9da is an MD5 hash be08c2de91787c51e7aee5dd16ca4f76 is an MD4 hash I know that there ...
2
votes
1answer
89 views

Flaw in HTTP Digest Authentication

I am working through my textbook and I came across this question: Below is the message format for a browser response to access a password-protected web page using HTTP digest authentication. GET URI ...
0
votes
1answer
112 views

How can I detect if hashes are salted? [duplicate]

Is it possible to detect hash function of a hash if I don't have access to PHP code? I know that if a hash is some kind of MD5, but I don't know if there is salt etc.
3
votes
2answers
1k views

What does GUID have, that a Whirlpool, MD5 or SHA-2 hash don't?

I'm trying to understand the use of GUID and what has always left me wondering is what's so special about them that I should consider using them instead of rolling my own type of unique ID. In other ...
2
votes
3answers
8k views

Why does MD5 hash starts from $1$ and SHA-512 from $6$? Isn't it weakness in itself? [duplicate]

I have moved this question from stackoverflow to this place. I know it may be a question about 'opinion' but I am not looking for a private opinion but a source of the final decision to keep it this ...
10
votes
3answers
2k 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 ...
0
votes
2answers
14k views

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 ...
28
votes
7answers
24k 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 ...
2
votes
1answer
85 views

Is MD5 ok to use if salted?

This post: http://www.gaiaonline.com/journal/?mode=view&post_id=19734573&u=8357925 Said that salted MD5 is ok but regular MD5 would not be ok. I am a bit confused about this and would ...
-2
votes
1answer
100 views

How MD5 and salt algorithms come into play if the attacker uses curl?

When the user logs into any site, they supply a username ('user01') and password ('password123') into a form then submit. The user has no idea what their hashed password value is that is stored in the ...
1
vote
2answers
73 views

Do you need to check the entire md5 hash value

Is there any likelyhood that two different versions of the same file will produce the same characters at the start of the hash and at the end of the hash (say, the first/last five characters) - is it ...
4
votes
1answer
154 views

Why is Windows password security designed this way? [duplicate]

Let's start with the LM hash. The LanMan hash had MONUMENTAL security flaws, like the password being case insensitive (converted to upper), which reduced the keyspace for a brute force attack. On top ...
5
votes
2answers
566 views

Why not slightly modify an existing hashfunction to create your own? [duplicate]

I read this interesting question on why improvising your own Hash function out of existing hash functions is bad. However this is specifically focusing on 'mixing' existing hashfunctions. What if for ...
-3
votes
1answer
73 views

Hash regex for malware recognition [closed]

I'm looking to store two types of hashes for recognizing blacklisted code. These are the FireEye "import hash" (or imphash) and the ssdeep "fuzzy hash". Is there a regex (or formal documentation) I ...
3
votes
1answer
474 views

Can I know somehow if my password hash is known?

Is there a secure way to know if my password's hash is publicly known on the internet? First I tried to search for it in Hashes.org (http://hashes.org/search.php), but then I suspected, that if it ...
4
votes
3answers
114 views

Can a file have the same MD5SUM but different SHA-1 results from different tools?

I have one file. SHA-1 and MD5 have been generated long time back. I do not know which tool has been earlier. Recently I generated SHA-1 & MD5 for the same JAR. Surprisingly I found that MD5 is ...
2
votes
0answers
45 views

Is the 64-bits length of the original string padded as well in the MD5 hashfunction?

So, for example I have a string which binary value is exactly 512 - 64 bits long, so the binary conversion of the string does not have to be padded. So that means I have a string of 56 chars. The ...
24
votes
1answer
2k views

How can the content of a file refer to its own MD5?

So I just saw this picture on Imgur: http://imgur.com/gxRCrCM The intriguing thing about it is that the picture refers to an old Daft Punk song named "Face 2 Face". The image's MD5 is ...
2
votes
3answers
227 views

Hashing passwords in OpenLDAP

I've seen a few posts on the internet saying most people store user passwords in OpenLDAP using one of OpenLDAP's many, built-in hashing functions. But OpenLDAP itself recommends handing off password ...
1
vote
1answer
66 views

Are multiple applications of a salted Linux MD5 hash easier to break than one? [duplicate]

I hashed the same password a lot of times (approximatively 1000 times) using the salted Linux MD5 format. I want to know if it's easier to recover the clear password or not. Is there something that ...
4
votes
2answers
871 views

What's the purpose of $LoginKey from the Ashley Madison leak?

According to this site Ashley Madison was keeping an insecure hash stored in their database using MD5, in addition to the far more secure bcrypt hash. This group used the MD5 hashes to quickly crack ...
2
votes
2answers
227 views

MD5 brute force on a faulty hash?

MD5 for passwords is considered insecure due to the ability to brute force and pick up the result. But what if I change some characters of an MD5 hash and I keep a record of that change so that ...
0
votes
1answer
150 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 -> ...
3
votes
1answer
148 views

What's the weakness of keyed-MD5 for message authentication?

I've seen public web API's using keyed-MD5 to generate message authentication code rather than adopting the HMAC algorithm. People wouldn't just invent HMAC for fun, so it must have some advantages ...
1
vote
2answers
93 views

Verifying Client with Server

I'm currently designing a basic Java program that uses sockets to communicate from a server to multiple clients. I want the clients to be unmodified, however, to prevent against users trying to use ...
0
votes
0answers
107 views

Would it take long to brute force a md5 hash like this?

1be8917510-36.51929856278002 10bce1af27-99.18403192423284 103fa11cc6-87.21158325206488 Few examples above and as you can see the pattern is: 1xxxxxxxxx-{a percentage (0-100) to 14 decimal places} ...
1
vote
1answer
124 views

Brute force a password with a lot of hash (of the same password)

I have a list of approximatively 1000 entities, defined using the following code : list[i] = md5_salt_unix_hash(random_salt, password) Where the random_salt is generated in each iteration and the ...
-1
votes
2answers
2k views

SHA256 to text or MD5

I want to decrypt a sha256 to text. Is there a way other than bruteforcing to decrypt sha256? Like if I convert that SHA256 to MD5 and then try decrypting?I know its hard and the possible way for ...
1
vote
2answers
556 views

injected code decode

Recently I saw a domain of mine was hacked and the hacker have injected his code in some encryption format as below. <?php $l___l_='base'.(32*2).'_de'.'code';$l___l_=$l___l_(str_replace("\n", '', ...
-1
votes
1answer
100 views

Disastrous aftereffects of a hashing attack

I am writing about hashing functions for my thesis. I want to know whether there were disastrous aftereffects of a successful hashing attack in history and what kind of hashing attack was used. ...
1
vote
2answers
127 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) ...
5
votes
2answers
927 views

openssl enc uses md5 to hash the password and the salt

Wikipedia states that md5's collision resistance is 2^18 (https://en.wikipedia.org/wiki/MD5). I just found out that openssl enc uses md5 to hash the password and the salt. Let's assume that I want ...
2
votes
2answers
121 views

Does recursive hashing weaken properties of a cryptographic hash algorithm?

Specific example of mine concerns the probability of collision, where I have two plain texts A and B that I want to hash using MD5. Given the cryptographic hash function H and the following: A' = ...
1
vote
1answer
702 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 ...
0
votes
2answers
2k views

Tool for generating MD4 collisions

There are a lot of research papers available online that discuss vulnerabilities of MD4 algorithm, but I couldn't find any implementation of these. Uptill now I have used tools like John the Ripper ...
9
votes
1answer
828 views

Checksums do not match when I download file over http

Just for the test I did the following: Downloaded a page from wikipedia via wget on remote server and named the file test.dat. Then I executed md5sum. I download the file via http and check it back ...
15
votes
7answers
4k views

Why does some popular software still use md5?

Nowadays no one dares to defend md5 for any use, and of course they should not! However, much popular software still uses md5 in applications such as password hashing (although it's not simple/plain ...
3
votes
1answer
244 views

Indicators of Compromise

Just to get an understanding of how indicators of compromise works. Take For example, in this article, the SMB tool. There is a MD5 hash for it. So is my firewalls or IDS supposed to be able to detect ...
-1
votes
2answers
1k views

Can NSA generate all hashes for rainbow table to break md5?

I was wondering about md5 encryption. It is good, and I agree that it is unbreakable. But this is why we have rainbow tables. What if bunch of people gather together and start brute forcing and ...
2
votes
1answer
2k views

John the Ripper - Calculating brute force time to crack password

I'm using incremental mode (brute force) mode in John the Ripper to crack Linux MD5 passwords. I'm trying to calculate the time it will take to run through all combinations of 12 passwords (with 12 ...
0
votes
1answer
245 views

Please help clarify password hashing - salted, multiple iterations of MD5 vs bcrypt/sha2, etc [duplicate]

I was reading an article about the Ars Technica hack here and had a couple of questions. The commenter said: "PHPass uses salted and iterated MD5 to hash passwords" My question is that if I were ...