MD5 is a hash function that is no longer considered secure from a cryptographic point of view. Therefore, it should only be used for backward compatibility.

learn more… | top users | synonyms

0
votes
3answers
293 views

Should I use md5 for my new application?

MD5 is a very fast hash and its output is short and easy to store. Should I use it for my non-security-sensitive application? I don't think so, but I can't seem to convince anyone else that this is ...
0
votes
1answer
141 views

1024 RSA Hash Signature attack. Forge a valid signature

I have an RSA signature of 1024 bit where i know the following: Public modulus N Public exponent (0x03) Cypher message Summary: An MD5 hash is calculated from a collection of byte and is used as ...
0
votes
1answer
236 views

Thoughts on secure hashing and the “mds” algorithm

Almost a decade ago Raymond Chen blogged [1] about the "hash reset attack" cautioning developers to record the content length in addition to the message digest. Recently I came up with a variation on ...
0
votes
1answer
237 views

Computing the padding of MD5

So I'm reading this question to learn more about length extension attack, and I want to make sure I understand the basics of padding. It says in the post that given the hash and the length of the ...
0
votes
1answer
55 views

Is it safe to use MD5 in a proof of work system?

Here is the POW system: you are given a string and you need to compute a suffix so that first few bits of the MD5 value are all 0. I know MD5 is collision vulnerable, but is it safe to use MD5 here, ...
0
votes
1answer
139 views

MD5 update functions

In the hashlib module in python is a function called m.update() where m is a ...
0
votes
1answer
485 views

What is the relation between hash chaining and chosen prefix attack

I read that hash chaining can be used to prevent hash collisions, while the chosen prefix attack allows hash collisions for algorithms like MD5. How are they related? Does hash chaining prevent the ...
0
votes
1answer
45 views

How to encode a message to MD5?

I have faced a problem to understand MD5 algorithm.My question is weather the original input message is converted to binary value in MD5 before using the input message as parameter in four Feistel ...
0
votes
1answer
97 views

Does MD5 hash have quasi commutative property? [duplicate]

I am implementing a one-way accumulator using MD5 hash, wondering wheather it has quasi commutative property or not.
0
votes
0answers
19 views

If one has hash = hash(salt + password) and one knows N pair of hash and salt is it easier to attack the password?

For example: $hash = md5($salt + $password) I know N pairs $hash $salt 60d0c34a37a71b279edaae4ffdcba86d 1 1d79c99d01f51f8e8b4c6505e8f6728e 2 ... Is it possible ...
0
votes
0answers
18 views

Filling in MD5 input variables

I have a majority of an input string(as well as the total length) and the output for an MD5 hash. Is there a way to calculate the remaining input bytes that I am missing?
0
votes
0answers
36 views

To understand Feistel permutations in md5

Recently I am trying to understand the md5 algorithm.In this algorithm 4 Feistel permutations FF,GG,HH and KK are used.I have faced a problem to understand the FF. The FF is defined as ...
0
votes
0answers
33 views

Can knowing part of what was used to generate an md5 hash make it vulnerable? [duplicate]

Say I am able to ask a black box MD5 generator to generate 1,000,000 hashes given input $STRING$ Where $STRING$ is an arbitrary ...
0
votes
0answers
68 views

MD5 SSL Collision Attack

I want to create fake certificate for test purposes. I have read about the http://marc-stevens.nl/p/hashclash/index.php project but I am unable to understand the two files that I have to put as input ...
0
votes
0answers
148 views

What can cause similar MD5 hashes

I have a set of MD5 hashes with huge similarities in the second half of the hash, (made up) examples: ...
-1
votes
1answer
148 views

Should I remove these use cases of MD5/SHA1 from my program?

I have a web app (a register and login system) written already but i am now improving it. One of its design goals was high security. I have some use cases of md5 and sha1 in it and now i am in doubt ...