Questions tagged [cryptanalysis]

Cryptanalysis is the process of analyzing a cryptographic system or algorithm in order to figure out flaws in its inner functioning.

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Determining the hash algorithm used [closed]

I have some test data: Test 1 Text: pass1234 Salt: 33b9d87b83c097ce3ea6e6f84a298f839aafc6d7aa23d909a43ac94bdee35ddf Hash: 61477724c136fb285918114792685a4d Test 2 Text: test1234 Salt: ...
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Identifying a toner chip and it's communication protocol to re-program it

I need help identifying a chip and how to reset it from a new brother toner cartridge TN227 and TN223. This comes from the new Brother HL-L3230CDW laser printer. There is currently no information on ...
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Do any of these details contradict the idea that theory that this file is encrypted with Blowfish?

I have a file which has been encrypted with some unknown algorithm. Doing research on the file format, I stumbled across a website that claimed (without explaining why) that these files were encrypted ...
4
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1answer
2k views

Having keys and binary, how do I reverse/decrypt a stream encryption?

I would like to ask if you have any idea or approach to reverse engineer a decryption algorithm to find the opposite encryption function. I do have all required keys and fields and of course the ...
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0answers
185 views

Overwatch Sombra ARG community asking for Cryto/Steg help [closed]

We are looking for some crypto / security expertise in solving some difficult puzzles in a ARG campaign for a Blizzard game called Overwatch. The challenges introduced and solved by the community ...
3
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1answer
846 views

Where to find a full analysis of the encryption scheme of CTB-Locker?

CTB-Locker is a currently active ransomware that encrypts files to lock users out. Here are a few links about this malware: A new generation of ransomware: Elliptic curve cryptography + Tor + ...
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1answer
191 views

Reversing Checksum of serial protocol

I'm trying to reverse engineer a serial protocol of a compressor, but i've no luck calculation the checksum. e.g. here are some messages including the 16-bit checksum at the end of the message. ff ...
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1answer
186 views

Time reverse engineering a “random” algorithm

I was just wondering if there are estimations possible for an algorithm using a fixed number of random binary or arithmetic operation on an input of how many (input, output) pairs are necessary to be ...
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2answers
8k views

Steps for determining the hash algorithm used

I have 5 test users and they have the same password. I am testing an application which stores the password in the database in an encrypted format. I want learn which hash algorithm has been used on ...
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3answers
39k views

What is the most efficient way to detect and to break xor encryption?

I know that modern cryptographic algorithms are as close as they can to fully random data (ciphertext indistinguishability) and that trying to detect it is quite useless. But, what can we do on weak-...