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Questions tagged [gpu]

Graphics Processing Units are a special chips designed to handle video processing in computers or handheld devices which involves complex maths calculations

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1answer
124 views

How do Field Programmable Gate Arrays (FPGAs) compare to Graphics Processing Units (GPUs); for cracking hashes?

As a general rule, GPUs are more effective than CPUs when it comes to performing acutely repetitive tasks, like iterating over lists and generating permutations of a set (i.e. exhausting dictionaries &...
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0answers
39 views

Video card - pci express security

I recently bought a second hand Nvidia video card which runs in SLI mode with my default video card. Can it be infected with a malicious program added by the previous owner, steal data from the ...
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1answer
167 views

Modern Linux GPU driver security

How secure are modern Linux GPU drivers? The threat model is an attacker who can execute arbitrary code in the context of an unprivileged user process, which is heavily locked down by seccomp-bpf, ...
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4answers
14k views

Spectre/meltdown on a GPU

Are GPUs vulnerable to spectre/meltdown attacks, since they have most of what makes CPUs attackable? Is there any information in the VRAM, that would cause trouble if it was stolen?
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1answer
220 views

AWS Elastic GPU Compute vs WPA2 [closed]

Looking at cracking a WPA/WPA2 handshake predetermined at 8 Characters long only. This means that there are: 208,827,064,576 possible combinations. Looking at toms hardware page and Rockfish Sec ...
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1answer
194 views

What should be the ideal course of action for a compromised GPU?

What should be the ideal course of action for a GPU that is suspected compromised, for example by a virtual machine using passthrough? Are there any ways to detect such an infection? If the computer'...
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1answer
634 views

GPU passthrough security

How secure is the host operating system from the guest virtual machine's OS when using GPU passthrough (using the methods described here)? If the guest is compromised, can it permanently infect the ...
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3answers
6k views

Does aircrack-ng use GPU/CUDA capabilities?

As stated, does aircrack-ng when brute forcing a WPA2 handshake capture use GPU/CUDA resources such as a program like Hashcat does?
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2answers
14k views

Password cracking speeds according to Hashcat

from the site: http://www.netmux.com/blog/how-to-build-a-password-cracking-rig - they used 4 GPUs: Hashtype: Keepass 1 (AES/Twofish) and Keepass 2 (AES) Speed.Dev.#*.....: 416.5 kH/s Hashtype: ...
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1answer
222 views

Could the unused Mali GPU in the Libre Tea Computer Card be a security risk?

The Libre Tea Computer Card is a single-board computer that comes without any proprietary software (at least that’s the goal, it’s currently in crowdfunding): […] all firmware and kernel sources ...
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1answer
196 views

Is it possible to use parallelism when computing a key derivation function for a single password/key?

Suppose I have an AES-256 encrypted file, and I want to derive the key using PBKDF2 and a given salt with a large number of rounds (say 1 million), but I'm limited by user tolerance for UI lag when ...
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7answers
23k views

How are GPUs used in brute force attacks?

I have read that GPUs can be used in brute force attacks? But how can this be done and is there a need for any other hardware devices (hard disks for instance)? Note: I'm more interested in web ...
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0answers
737 views

how many sha1 hashes per time on current hardware [closed]

How many sha1 hashes per second can current hardware (say a 500$ gpu) compute, when the input is 256 byte long? (or any other length). The question behind is how long (or how costly) is it to mount a ...
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2answers
343 views

Does password-hashing “busy-work” need to be cryptographically secure

All modern password hashing schemes are deliberately designed to include a huge amount of "busy-work", to limit the speed with which an attacker would be able to conduct password hashing attempts. ...
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5answers
56k views

How long would it take to bruteforce an AES-128 protected pdf knowing the key is 20 letter long and that the charset is A-Z,0-9?

The question says everything, knowing that a pdf is protected using standard Adobe password encryption that comes with Acrobat Pro (which as far as i know is AES 128) how much would it take to ...
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1answer
386 views

ASIC/FPGA hardwares to compute Scrypt hashes [closed]

this company claim Scrypt mining by ASIC (on crypto currencies who use scrypt hashing as proof of work) scrypt is made to keep ASIC/FPGA attackers away, is that claim expired?
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1answer
6k views

Brute force password cracking with a GPU

How are GPU's provisioned for password cracking? Do all, if not most cracking programs have special GPU aware software or do they just function at the basic driver or API level of the device? Can it ...
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4answers
8k views

SHA-512 unix passwords. How secure are those hashes, really?

I came across this very alarming sounding thread which indicates a GPU with about half the compute capacity of the GPU currently powering the monitor I type this on is capable of 11.5k c/s. I'm not ...
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3answers
537 views

Are there implementations of password hashing algorithms for major frameworks that utilizes specialized hardware like GPUs/FPGAs?

It is common knowledge that password cracking attempts can greatly benefit from specialized hardware such as large clusters of GPUs or FPGAs. Are there any implementations of the commonly recommended ...
2
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1answer
2k views

Brute-Force GPU Password Crackers

Brute-force password cracker programs which claim GPU support include John the Ripper, ighashgpu, oclHashcat, and others. oclHashcat appears one of the more popular, but I am not sure which AMD/ATI ...
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2answers
2k views

Is OpenGL a security problem?

Today, almost all desktop and most mobile operating systems and devices support some version of OpenGL. I'm wondering about the security implications of that: In many cases, the GPU has complete and ...