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Questions tagged [decryption]

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

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Disable Encrypted Protocols Through Firewall

In my company, we have two internal domains with a firewall between them. When requesting firewall rules for an application with components on domain A and domain B, I was told that encrypted ...
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How to determine what cipher I encrypted a file with?

Years ago I had a bunch of bitcoin in a wallet that I encrypted. This was back when bitcoin was like $0.20 or $0.30 each. At one point I couple hundred of them but didn't know what to do with them. I ...
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Anyone know what method of encryption was used for this text and what tool to use to decode it? [duplicate]

The text is jA0EBwMC9X3xh+z164u30k8BmODUUiKZhYIBiqDoukxwe02XNiDEP0GVSDMLTNo5 EE4lWYV/NKcniek8RvtCS2JKR/i00gwUts1zeAK3p4SkbUFxM0tDqQ00AReIrXBe =0loc
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2answers
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Required a simple guide for secure messaging application

For my personal research, I have to create a messaging app, but security is only important part of application, security from MITM (man in the middle attack), at device end, and at server level. (note:...
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Need some help with decryption

I've used x64dbg to work out decryption in a particular program. I've found where it changes the encrypted material into readable text but can't work out the best way to use this information to ...
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How is data Encrypted and Decrypted from a database with PHP Sodium

I'm a PHP web developer who has been trying to learn and understand how to encrypt and secure the data stored on a database with PHP Sodium. In terms of security knowledge I am very new to the area ...
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1answer
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Authentication followed by storage decryption on login?

I got a typical login setup: Username/password that is passed to server, hashed/salted with PBKDF2, then compared to hashed/salted entry in login database. After that, JWT token is generated and ...
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Cracking a ZIP-File password [duplicate]

This might be a stupid question, but I do not have a lot of knowledge about this kind of profession. I have a password-protected .zip file, and I want to know how to crack it. I have tried "zip2john" ...
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Cracking zip password [duplicate]

I am trying to decode a zip file password decoded form of: %3C%7C%3D3r%28Strong%29 I have tried to convert in to MD5 hash and use john the ripper to crack the password. Can someone explain how to do ...
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1answer
437 views

How to decrypt Chrome saved password from “Login Data” file

Is there a way to decrypt passwords from Chrome Login Data file? My goal is learning about the backend process of this decryption, so I don't want to use any pre-built applications.
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How TLS symmetric encryption works?

After the secret symmetric key is exchanged, how does it look like? What length (in a production use) is it and what can influence it? How the key is used to encrypt / decrypt a piece of data? I ...
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1answer
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WEP QOS_DATA vs DATA decryption - difference?

I recently played a bit with my hardware pocket size IV WEP sniffer. It's a 5v tool that i use in my lab when bored: https://www.youtube.com/watch?v=jJyRaWrnbJg In my tests i figured out one of my ...
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1answer
179 views

Purpose of Decrypting & Scanning HTTPS traffic

Navigating to the below URL link from the Mozilla Firefox and entering some website link and clicking on View, displays certificate Viewer chrome://pippki/content/exceptionDialog.xul After enabling ...
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2answers
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what should be done to use sodium in a secure way?

Now, I've done some research by googling about the subject and reading the manual and read other topics about this at stackoverflow. But still I have a question about the security and secrecy behind ...
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1answer
101 views

What can a hacker do if I publish my email id and password but have 2FA on all of my accounts?

I have 2FA on ALL of my accounts. But my password was leaked in 7 breaches. Unfortunately I have used the same password for most of the accounts. Is it possible for him/her to bypass the 2FA?
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Common Encryption types with keys stored in Base64

I am a noob :) I am attempting to recover a password from a piece of software. The software has a XML file contains three fields that appear important to this process: Password Value, EncryptionKey ...
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I found this easter egg, any ideas what kind of encryption it is? [duplicate]

I am looking to have the cryptography identified of this encrypted message aHR0cHM6Ly9nb28uZ2wvZXY5SDN1 Any ideas what crypto was used here? Thank you
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Can I know the RSA encryption algorithm using the key-pair and encrypted data? [duplicate]

I generated ssl certificate and its key shared it to a third party. They claim that they use my ssl to encrypt data using RSA PKCS1. But I am not able to decrypt it using RSA:ENCRYPTION_PKCS1, I ...
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1answer
673 views

Decrypt file using Key and Initialization Vector in Linux

I am Salesforce developer but new to the Security World as well as Linux. We encrypted a file with Key and initialization Vector in Salesforce(only symmetric encryption is possible in Salesforce). No ...
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How to know what type of encryption/encode has used? [duplicate]

is there any way to find the type of encryption/encoding is being used? For example, i'm implementing gmail API application while fetching the storing credentials those are stored in encrypted mode ...
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GnuPG verify signature *after/while* decrypting does not fail when it should

I'm encrypting and signing data with the PHP function gnupg_encryptsign() (docs) which has the strange behaviour of signing first and encrypting afterwards. I'm aware of this thread saying this is ...
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1answer
386 views

Extracting openssl pre-master secret from apache2

I would like to be able to decrypt my server's https traffic for debugging and analysis. My server is a debian 9 Apache2 server running mod_wsgi and django. I have seen this post: Extract pre-master ...
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1answer
54 views

How come keys can stay secure through factorization of primes

Sooo I under n=pq where p and q are both large primes so it making factorizing them inefficient to the point of impossible but there must a a list of prime sets (heard people call them trap doors I ...
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1answer
183 views

Deciphering ciphertext with an unknown key and algorithm [closed]

How can I get started on understanding how to decipher this ciphertext when I don't know the algorithm or key used? TDcbY xqCa NeAA OsWMirK FNFOm bYRUYAkxl,  tqwl  axZU  XTaLrBSFv OI G vWjBZyqhz.  ...
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Decryption of TLS/SSL Traffic With the debug file of fiddler on wireshark

I wanna decrypt some packets on Wireshark, when I search the Internet, some people were said to use SSLKEYLOGFILE environment, I do the stuff, but it looks like that chorme doesn`t update that file ...
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1answer
310 views

How do I decrypt a .dmg image if I know details about the password?

I encrypted a folder and forgot to save the password. I remember how long I made the password (40 characters) I know the last two characters (40) I don't know the first 38 characters but I do know ...
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How to decrypt wifi traffic in realtime and write it to file with Tshark?

I have Wireshark setup to decrypt and display packets in realtime. But I need to have them written to file in realtime also. Someone suggested Tshark, but I can only get it to write to file and not ...
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97 views

For encrypted chat app, how can I store sent messages so that they are encrypted but still can be viewed by the sender?

Actual implimentaton will be in android but this is more about general security than actual implimentaton details. I'm making an end-to-end encrypted chat app and I know that in order to send ...
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1answer
304 views

How to decrypt Diffie-Hellman encryption in WebRTC?

I have installed a WebRTC server application, which is designed for Contact Center solutions: communicates with internal PCs in pure RTP (agents), and with external PCs (customers) using encrypted ...
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2answers
180 views

How did Google “decode” my Gsuite password? [closed]

Google has recently admitted they were storing "G Suite" users' passwords un-hashed on their systems. But if a hashed password was transmitted to Google when I logged in to my account then how did ...
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Why does OpenSSL fail to decrypt when the key is too large?

I have the following groovy script: cmd1 = "echo ${really_long_key}" ssl_cmd = "openssl aes-256-cbc -md md5 -nosalt -a -pass pass:${encryptPassword} dec" def process = cmd1.execute() | ssl_cmd....
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1answer
120 views

Android leaking app analysis

In my thesis I'm trying to analyze leaking private data on Android apps. I noticed that the vast majority of data is encrypted. How can I analyze this data without decrypting it?
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130 views

TPM 2.0 Bus Encryption / Decryption?

It seems that in TPM 2.0 a call to TPM2_StartAuthSession() is able to start a decrypt/encrypt session. However, the caller forwards all the key generation material to the TPM in plaintext, and then ...
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1answer
95 views

encrypting file and user have public key to decrypt in barcode [closed]

I want code very secure system and I need some answers and help. Is this secure if encrypting file and it is possible decrypt with barcode/QRCode where is decryption key to view it. I've thinking of ...
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Intentionally slow decryption

We need to store the user ID of authors of messages in a database. It should be possible to find an author of a problematic message i.e. on police request in minutes, but it should be very hard to ...
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Decrypting EFS files

I'm learning digital forensics and have been given a Windows Vista image with a bunch of files encrypted using EFS. The image has been sufficiently mangled that it'll never boot, but I have managed to ...
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1answer
154 views

Microsoft Bitlocker Decryption interrupted. Cannot decrypt again

I've locked on of my USB drive with BitLocker. When I was decrypting(removing BitLocker), my PC went off due to power cut in the halfway of decryption. Now, when I'm trying again to decrypt using ...
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1answer
218 views

Cross platform OpenSSL aes encryption

I encrypted a file by using the following command from a stackoverflow answer: openssl enc -in file_name -aes-256-cbc -pass stdin -out file_name.aes; I can decrypt this file by running: openssl enc ...
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635 views

How to crack encrypted Android SQLite DB? [closed]

I am testing an android app which has DB encrypted (AES-256), I extracted it from system files /data/data//databases, I have following doubts, How do we ensure that DB is encrypted properly and it is ...
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1answer
376 views

Decrypting AES-128-CBC leads to first block being correct, the rest corrupt

I'm currently investigating a piece of software which encrypts it's files with AES-128-CBC. From disassembly it is truly known that the algorithm used is correct (log messages plus calls to the ...
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3answers
370 views

Losing the Initialization Vector in Cipher Block Chaining

I have written a message and encrypted it using cipher block chaining. What will happen if the receiver loses the Initialization Vector, or doesn't receive at all?
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1answer
223 views

I need to compute a string whose SHA256 hash matches a given prefix. How should I approach it? [duplicate]

Is there any (more efficient) way for computing any string with a given prefix in it's SHA 256 hash? And how probable am I to stumble on such a string if I brute force?
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1answer
68 views

Need to decode, don't have key [closed]

So my friend gave me this monster of a code but I dont know WHAT it is and they said it can be solved as is ... I've been working on it for a week and its making me mad. Got any ideas? ...
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2answers
759 views

Best way to know the algorithm used for a password encryption

I have the following password captured using sqlmap- $2a$08$9eaKUtKdFV8fuOAx0sfr4emrG1aHzGeNsn/rVdW243nw6Ktt.Uc0O Now, I don't know how to decrypt this password because I don't know which ...
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1answer
309 views

What happens to PKI once quantum computers can break encryption?

They say that public key infrastructure or PKI uses very complex encryption. What if that encryption breaks one day when quantum computers complete? What if they decrypt all private messages and data? ...
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1answer
338 views

Java Code for Pass Encryption/Decryption [closed]

I want to save an encrypted password (the encryption may be produced manually or using java code, and the encryption technique type does not matter), then the java code will read the encrypted pass ...
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0answers
32 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
82 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
636 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
137 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 ...