Questions tagged [brute-force-attack]

A brute-force attack is attempting to find a secret value by trying all possible values until the correct one is found.

15 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
3
votes
0answers
144 views

Brute force attack multiple stream cipher

Assume that a scheme used to secure a specific system $Π=(Gen,Enc,Dec)$ which is thought have indistinguishable multiple encryption in the presence of an eavesdropper. For any adversary $A$ that can ...
2
votes
0answers
156 views

Cryptographic key Length

How long should a block cipher key length should be? what key length from below numbers can be treated as safe, keeping in view the current/ future brute force capabilities. 64 bit 80 bit 96 bit 120 ...
2
votes
0answers
819 views

How long does it take to brute force Blowfish-448?

I am conducting an investigation on the efficiency of AES and Blowfish with regards to memory when encrypting data of varying sizes. I open my essay with an introduction as to what encryption is and ...
2
votes
0answers
449 views

Number of pairs needed to attack Double DES?

I'm having trouble understanding why,in order to do a brute force attack on a double DES (2 keys), one needs to have at least 2 pairs of known plain text? Same with 3DES (3 keys) one needs to have 3 ...
2
votes
1answer
823 views

Is it safer to use timestamp in REST authentication?

I am working on a personal project to build a REST authentication system which authenticate clients via three parameters: ...
1
vote
0answers
192 views

Triple DES: Does knowing the plaintext limit my keyspace for brute force?

My goal is to try and decrypt a single 8 byte block of a Triple DES encrypted data block and in doing so discovering the 8 byte keys that were used. This is mostly an academic exercise but could ...
1
vote
0answers
634 views

Average time for a brute force attack given 200 try per second

This is from an exam question. What is the average time to success at a brute force attack on a 56-bits key algorithm, if you're able to make 200 tries per seconds? Let's suppose we got a crypted ...
1
vote
0answers
244 views

Resynchronizing brute-force attack against stream ciphers

There is a stream cipher without any known cryptographic weaknesses. The attacker knows parts of the key so she can reduce the key-space to a size that can be practically brute-forced. However the ...
0
votes
0answers
9 views

How to crack my laptop password?

Suddenly I forget my Laptop password, I tried a lot but my laptop is not accepting. I just go through the internet, so that how can I crack the laptop password. I came to know, maybe "Brute-Force ...
0
votes
0answers
26 views

How many repetition in Ciphertext-Only-Attack?

Given the following algorithm, how many times do I need to repeat step 2&3 to complete the attack? Please note that block size and key are 128 bits. Step1: Prepare set S of size 2^k which contains ...
0
votes
1answer
135 views

Time taken for Brute Force Attack on DES

An attacker is equipped with a computer that performs 10 trillion (1013) DES decryptions per second, what is the average time required, in hours, for a brute force attacker to break DES? Key size is ...
0
votes
1answer
75 views

What is the current security level of an algorithm?

I was reading a paper of some years ago about a cryptography and a phrase got my attention. We want to ensure a security level of at least $2^{80}$ I know that $2^{80}$ was used as rule of thumb ...
0
votes
0answers
67 views

Argon2id benchmarks

Recently I've decided to publish a simple app that I am using for maintaining and storing sensible encrypted data on the cloud. https://www.microsoft.com/store/apps/9NSGBQSJ2HD6 The hashing is done ...
0
votes
0answers
99 views

How to bruteforce password from HMAC-SHA256 hash (if you have the key)?

Short of creating one's own script / program, is there an existing, readily available way of iterating through a list of potential passwords to find which one corresponds to a hash (HMAC-SHA256), ...
0
votes
0answers
536 views

Brute Force AES Calculations

I have an encryption service in which the user decides the length and the type of key, so I would like to build a tool that educates the user on the brute force times for the key they created if using ...