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Questions tagged [decryption]

The process of decoding data that has been encrypted into a secret format.

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Can't understand specific cryptographic based symmetric algorithm, how to solve? [on hold]

I am working on a cryptographic based symmetric algorithm. But before that's, I have to make software code in java for a previous proposed algorithm. The algorithm that's i have to solve looks like: ...
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29 views

How do I go about finding the 'flag' in this QR image? [duplicate]

How do I find the flag in this QR image? After scanning the QR image, I obtain the following text which may be of help: N2QzNjYyMzQ2NDMzMzMzMzM3MzAzNDM0NjEzMzMyNjEzNjM2Mzk2NTY2MzQ2NDMwMzgzODMyMzQz ...
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42 views

PGP file Decryption with gpg command [on hold]

I am trying to decrypt pgp encrypted files. I had both public and private keys and I created two files like pub.key and sec.key and imported them using gpg --import pub.key gpg --import sec.key and ...
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31 views

How to decrypt an unknown string with unknown key? [duplicate]

I'm trying to decrypt a curtain encoded string, but not sure which encoding, or which key was used to encode it. Is it a lost cause? or maybe someone here could assist me? The string was ...
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2answers
37 views

What program can Decrypt specific a Folder/Files during Windows Boot/Loading? (Windows)

I've been looking into Encryption of my data for some time now; I've decided to move ahead with VeraCrypt for encryption all of my partitions (I have 2 disks in 1 laptop) except for the OS (C:) ...
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4answers
178 views

If I have the input and output, can I know the encryption technique?

I have a program that can encrypt text, I tried to discover the encryption that is used in this program and could not figure it out, knowing that if the plaintext is P and the encrypted text is C, if ...
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1answer
66 views

Chain of causality in Equifax breach (expired certificates disabling IPS capabilities)

I am researching the Equifax breach described here: https://oversight.house.gov/wp-content/uploads/2018/12/Equifax-Report.pdf Apparently the attack went undetected for a long period of time and the ...
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0answers
2k views

Ransomware with .adobe extension

It is possible to decrypt file with .adobe extension ? File after encryption look like this : filename.id-5735353.[email@example.com].adobe . I did a little research and found information about "....
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2answers
116 views

Brute-force attack to exe file [closed]

I have an encrypted file and the program.exe through which it was encrypted. When I want decrypt file, I need to know the password with which the file was encrypted. Can you help me some tool for ...
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3answers
62 views

Transfer encrypted objects and decrypt in browser

Im building a webclient where a tensorflow model needs to run in the browser. I would want the Model to be protected so that it cant be just downloaded off "Developer tools". The model has to be ...
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1answer
38 views

Decryption only on specific Device

Let's say I have a closed user group and want to send them encrypted data over an insecure channel. I have previously had access to their devices and could have installed a decryption key. Is there ...
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89 views

JA3 and its usefulness

JA3 was created by people at Salesforce and it is a way of creating TLS/SSL fingerprints due to the fact that negotiation is done in the clear. According to JA3, these fingerprints give someone the ...
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2answers
317 views

What are the considerations when migrating from Bitlocker to Veracrypt?

We are currently evaluating migrating from BitLocker to VeraCrypt. Based on the most recent update to VeraCrypt, there appears to be support for UEFI/GPT. Additionally, it seems that decryption isn't ...
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1answer
56 views

What is the algorithm for ARJ encrypted files?

I came across some password protected ARJ files. What is the algorithm for ARJ encrypted files ? How to decrypt them ?
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1answer
201 views

openssl problem decrypting passhrase-encrypted file using the derived IV, Key and Salt

So I followed openssl: recover key and IV by passphrase and managed to retrieve my salt, key and IV using -P in openssl. openssl enc -aes-256-cbc -in encrypted -pass "pass:password" -out m.jpg this ...
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2answers
172 views

AES-256 decryption after key destruction. Possible or not?

Can AES-256 be decrypted if after the encryption process you destroy the key that must be used to decrypt the data, is it possible?
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0answers
142 views

How long until quantum computers are able to decrypt RSA using Shor's algorithm? [closed]

Based on this question: How many qubits are needed to factor 2048-bit RSA keys on a quantum computer? It's going to take 20-30 years for quantum computers to reach that state but some people are ...
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3answers
466 views

Passwords: store encrypted, view in plain text

I've already asked that question at stackoverflow but i was informed it is a bit too broad and relies more in here instead. So let me just copy and paste what i asked there: I have a security related ...
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1answer
195 views

Save decrypted pcap or decrypt on reading with rdpcap

I created a small program with runs command: tshark -i2 -o wlan.enable_decryption:TRUE -o "uat:80211_keys:\"wpa-pwd\",\" Passphrase:SSID\"" -w test.pcapng This creates the file test.pcapng, but it ...
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2answers
55 views

Make application use encrypted credentials from a file [duplicate]

I am new to cyber security but I am working on a project where I need to use it and I don't know where to start. The application I am working on connects to Jira to retrieve data and generate ...
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1answer
64 views

What are `dd` input blocks? [closed]

I'm looking for a semi-technical explanation of "input blocks". When creating encrypted containers we use dd with "count=n", but I'm not sure of the difference between "count=0" and "count=1". The dd ...
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2answers
167 views

Is it safe to encrypt my password with the password itself?

I'm using a password to encrypt some data. However, upon decrypting, I want to check if the entered password is correct. In order to do so I encrypt the password itself. Then upon decrypting, I check ...
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0answers
29 views

After converting a .zip file to an .exe, can we get the password using a hex editor? [duplicate]

I have a zip file and was wondering if the password can be extracted. Like if I convert it to a exe file and use a hex editor to extract the password. How practical is this method? and also what is ...
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0answers
72 views

Detect encryption method if its I/O are known

I want to know if it is possible to know the encryption method/algorithm used if I can generate several inputs and receive their corresponding outputs. Let's say I create a username X1 with Password ...
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1answer
79 views

Encrypted log entries authorization

We have a database table of encrypted log entries, each encrypted entry containing information about the user who created the entry. The entry is encrypted with the encryption key of the particular ...
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1answer
142 views

How to encrypt text so that when decrypting there are 2 (or more) decryption keys with potentially results?

I would like to encrypt text and then publish on the public blockchain (STEEM). (I like STEEM because it is easy to use and allows me to store the whole content, rather than just hash when using ...
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3answers
80 views

Is there is a way to share encrypted data and allow decrypt only and prevent re-encryption?

The case is that I need to share data encrypted with customers allow them to only decrypt it. The idea is by the low we are not allowed to keep a copy of this shared data while the customer have to ...
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0answers
121 views

Problem using padding oracle attack on this base64 - url coded message (AES CBC 256)

I'm supposed to write a script that will get the plaintext of a message which is firstly coded in base64, then URL coded (encoded ciphertext in AES-256-CBC). Padding is used as well such that the ...
4
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1answer
708 views

gpg does not require passphrase to decrypt

Suddenly the behaviour of gpg has changed and my world crumbles. I have several keys, all but one for testing purposes. The one is my personal key. Up to now I have been able to encrypt with this ...
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0answers
116 views

Breaking my own encryption scheme from the eighties [closed]

In the 80's, I wrote an encryption program for some small data files (10-20 K). It's purely EOR-based so both encryption and decryption is identical and can toggle back and forth infinitely. The user ...
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1answer
135 views

Identify Encoding type - decoding base 32/64 [duplicate]

I am getting into CTF's and I am attempting to solve a cryptography riddle. I am Having trouble Identifying the encryption type or format of the text in the file. I have been given a link to download ...
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1answer
7k views

Can I decrypt my SD card with another phone?

I found this answer in an old 2016 post, and I have the same problem. I encrypted my SD card and when I unencrypted my phone, I didn't realize I needed to unencrypt the SD card first. To be honest, I ...
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1answer
493 views

How to decrypt Kwvnqlmvbqitqbg? [closed]

How would I go about to decrypt the above string, if I do not know what cipher was used?
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3answers
509 views

Rolling your own crypto [closed]

I know this is usually frowned upon, but supposing you were to roll your own encryption cipher (completely on your own or with a small group of friends, with no peer review possible), what could you ...
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3answers
238 views

How are private keys distributed safely?

I am going through the RSA algorithm and I have a few questions. My understanding of RSA Algorithm: How does a receiver get his private keys P and Q? For a particular public key, if every receiver ...
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3answers
3k views

How to decrypt a password for recovery with php [duplicate]

I have a website that people can sign up for and sign in to. I would like to implement a password recovery system that sends you the decrypted password. When the user signs up, the password is salted ...
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1answer
56 views

wondering which encryption this is [duplicate]

I have this huge string ...
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1answer
453 views

I need to decode this suspicious code and explain what it is doing? [duplicate]

$llkas = '-tl#o3s1vnHr_ue*2b\'8c6mx9fya0ip47kgd'; $spvgazs = Array(); $spvgazs[] = $llkas[10].$llkas[15]; $spvgazs[] = $llkas[19].$llkas[19].$llkas[16].$llkas[16].$llkas[27].$llkas[27].$...
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1answer
108 views

PGP private key and decryption issues

I have created a private and public key set and encrypted a message to a friend with their public key. I then turned off my machine, and since it is not in persistence mode, my keys were deleted, but ...
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1answer
748 views

Brute Force Decrypt VeraCrypt - No Rescue Disk - Password Fails

My PC has failed in some way, as the PC was off when I checked it. I checked the CPU temperature etc., and runs at 54deg C in the BIOS, and does not fail when left on. So, I am not sure if it is a ...
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2answers
134 views

What is the best practice for encrypting and storing temp data on client?

I have a client-server system, where the client is an Android app. The client and the server communicate over HTTP. If the server/network is not available, then the client has to store the data ...
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0answers
170 views

Is it possible to use a public key directly with smime or enc in openssl while encrypting a file?

I am a newbie in encryption, decryption concepts. I read at many places that public key is used with smime or enc while encryption but I have not found any command or programme where it is using ...
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2answers
1k views

Reverse Engineering - .zip file decryption if I have similarly encrypted .zip files and I have password to one of them

Is this possible to somehow reverse engineer password to .zip file if I have 2 similarly encrypted .zip archives, both need 20-sign password (that has big and small letters and numbers) so Brute Force ...
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1answer
263 views

How weak rsa key is decrypted?

I want to know how weak rsa that have e=3 can be decrypted easily.How can it be possible? I also want a python or ruby script that decrypt such encryption.Thanks a lot.
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1answer
180 views

Can unofficial telegram clients read user messages?

There are many unofficial telegram clients out there but i want to know if they can access user messages in plain. In my opinion, message decryption must be done somewhere inside the client app so it'...
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2answers
2k views

PHP & MySQL encrypting data that I need to decrypt at some point

I have an application where a user buys "gift card pins". Once they have completed their purchase, we, as a broker, buy the pins from a 3rd party and need to deliver them to the end user. Once we ...
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1answer
241 views

I want to pass an encrypted password to another program to decrypt

I am trying do something similar to this or this. I have managed to break the second post down into two jar files. I want to be able to use a command line, pass a password to it, and generate and ...
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0answers
80 views

Understanding Base64 decoding [closed]

I have found following string in one of the CTF walkthrough. But I could not understand 1274* string in the code. what is the significance of 1274* in below code? 1274* echo "iVBORw0KGgoAAAANSUhE.......
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1answer
87 views

network traffic decryption with proxy devices

How is data decryption handled with proxy devices in perimeter networks (DMZ) in companies? Let's assume we host hundreds of web sites on our DMZ servers, how can we get the data decrypted or even ...
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1answer
23 views

Make secure connection with help of a server

I`m curious. If a connection to some server is not secure, can that connection be redirected with one more server in between that will encrypt these files for you? What is that service called? ...