Tagged Questions
0
votes
1answer
51 views
length extension attack on an MD5 hash of a text file of about 10K Bytes?
How much computing time on a typical desktop computer would it take to find a new length and new data to extend a text file of about 10K Bytes with a given MD5 hash?
3
votes
1answer
175 views
Using an MD5 hash as a password
Suppose Alice is using a password prompt that only accepts up to 32 characters for any particular password.
Memorization of long strings of random characters is not one of Alice's strengths, so she ...
6
votes
1answer
195 views
Can I find two specific words with the same md5 hash?
I want to find two strings containing special words like "yes" or "no", mixed with random characters, for which the MD5 hash is equal.
An example of what I'm looking for:
...
0
votes
0answers
68 views
MD5 > Would multiple hashings increase security? [closed]
A Simple question,
if i run a string trough the standard md5 encryption function multiple times, does it increase security the more i do it? does it protect against rainbow tables? etc.
2
votes
1answer
111 views
A question regarding relevance of vulnerability of MD5 when linking multiple records together
I have been studying a Supreme Court case "IMS Health vs Sorrel".
In this case a Friend of Court brief filled by "Electronic Privacy Information Center" states that use of MD5 hash function to link ...
0
votes
2answers
168 views
Finding partial pre-image of MD5 hash
I have the following requirement for hashing using MD5.
H(A,B,C,X);
Where values A,B & C are given. However X is not given.
I would like to find out what value of X would give a hash beginning ...
4
votes
2answers
192 views
Do MD5's weaknesses affect Oplop?
Oplop is an algorithm that generates account-specific passwords from a master password and user-chosen nickname (typically username@domain). From the website:
Concatenate the master password with ...
4
votes
1answer
405 views
Is a second preimage attack on MD5 feasible?
What's the practical status of MD5 w.r.t. second-preimage?
Integrity of a piece of data is protected by an MD5 hash, itself assumed genuine. The data (and thus the hash) is known to the adversary. ...
0
votes
3answers
212 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 ...
4
votes
2answers
594 views
128 bit hash with least chance of collision
I'm building a storage system for JSON documents where they are looked up on a 128 bit key. These JSON documents have a timestamp within them, but apart from that are user-entered data. These JSON ...
1
vote
3answers
304 views
reverse of md5sum
This might be out of ignorance, I apologize, but how complex of a problem might it be to generate a file of size N whose md5sum is X?
For example,
...
1
vote
1answer
263 views
HASH Algorithm for 8 bits MCU
I need to implement the HASH algorithm (MD5 & SHA-1) on an 8 bit MCU. I hear it can only be implemented on 32bit and sometimes 16bits MCU. Is that possible? I will appreciate link where possible. ...
4
votes
2answers
216 views
Cost of attacking Mobile OTP with a fake server
You want to obtain a 74-bit secret $K$. There is an oracle that will provide you with the following value for several values of $T$:
...
0
votes
2answers
347 views
Can md5 be used for encrypting data?
I know that md5 shouldn't be used for password hashing because of collisions and possibility of making dictionary attacks e.g. using rainbow tables. But what about ...
8
votes
5answers
3k views
Are there two known strings which have the same MD5 hash value?
Is there an example of two known strings which have the same hash (MD5) value, i.e. an MD5 collision?
9
votes
3answers
573 views
Why does the padding in MD5 contain the message length?
I understand the need for padding in MD5. But why do we append the message length to the padding?
I heard it strengthens the hash but how?
Please provide an example if possible and how it applies to ...
3
votes
1answer
163 views
Is the last step of an iterated cryptographic hash still as resistant to preimage attacks as the original hash?
Considering a cryptographic hash, such as MD5 or SHA2, denoted by the function $H(m)$ where $m$ is an arbitrary binary string, there is a lot of material available that deals with potential weakness ...
5
votes
4answers
290 views
Does MD5 generate 128 independent bits?
I heard that there are 128 stochastically independent bits in an MD5 output. Is that true?
If so, are there any citations or proofs for that?
7
votes
1answer
390 views
Change in probability of collision when removing digits from MD5 hexadecimal hash values
I am aware that MD5 has a known collision vulnerability and should not be relied upon when uniqueness is required, but in the environment I am working on I only have access to MD5 hash function. ...
