Questions tagged [decryption]

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

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3
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1answer
99 views

Same network steal data?

Say my home network has a wifi-password and my friends are connected to it (since I gave them my wifi-password). Is it possible for me to read their data transfer? If yes, then it would also be ...
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1answer
99 views

Prevent server MITM attack

I want to create a secure messaging application such that you don't have to trust the server. Register with username and password. -> Generate a pair of PGP keys (RSA). -> Encrypt the private ...
8
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3answers
1k views

What makes a symmetric encryption algorithm cryptographically secure?

I'm trying to learn a bit more about symmetric encryption and found out that basically every symmetric encryption and decryption is (somehow) in the end based on a simple XOR-Byte-Toggle with using a ...
0
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0answers
44 views

About password ciphertext [duplicate]

I need to decrypt a password. I have the ciphertext for this however, I have many plain text and encrypted equivalents. This device can only be given passwords with a maximum of 8 characters from the ...
0
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0answers
65 views

Step-by-step file encryption/decryption using user-supplied password

Let's say I want to build a dropbox clone. When users upload files they need to be encrypted. Later on, when the user needs to access their files, the application should be able to decrypt them using ...
11
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1answer
2k views

If a WAF is compromised, can the adversary view all the traffic in clear text provided WAF uses SSL cert to decrypt it?

I understand Web Application Layer Firewall (WAF) uses an SSL cert to decrypt and inspect the traffic before passing to the backend server. If an attacker could gain admin access to both the WAF ...
4
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2answers
613 views

Web-based secret manager using CryptoJS

I'm building an application, part of which will allow businesses to store secrets. I'm looking at using CryptoJS (https://www.npmjs.com/package/crypto-js). This would encrypt everything on the client ...
-1
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2answers
249 views

What does it take to brute force 42 hex characters [closed]

What does it take to brute force something like this 00f54a5851e9372b87810a8e60cdd2e7cfd80b6e31 I can brute force anything else like iambad, blackapple1, etc But how can I brute force something like ...
0
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1answer
159 views

Intercepting responses using mitmproxy in Python. Problem in decryption

I have set up MitmProxy with a Python script to intercept network responses from one domain, used by a Desktop App. However, when I start up the App, I get the following series of transactions { &...
0
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0answers
13 views

I have input text and 2 output of encryption short and long key. How to find algo being used [duplicate]

I know it's hard to find but I am still trying to find it. I have one input and two outputs as "short" and "long" keys. I want to find which algo or encryption is being used. The ...
0
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0answers
41 views

How is Firefox Lockwise able to decrypt saved logins without primary password? [duplicate]

I was wondering how Firefox Lockwise is able to securely encrypt and decrypt saved logins across devices without using a primary password? As far as I understand, regardless of whether an encryption ...
0
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0answers
64 views

Listening to other network traffic on a known WiFi network using libpcap

I want to use libpcap to listen to the network traffic on another server on my home WiFi network. In this scenario i already know the password and ssid. I have already changed my network adaptor to be ...
0
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0answers
248 views

I can't decrypt chrome passwords offline with sha masterkey

I'm trying to decrypt a Chrome 80+ Login Data file offline using the SHA1 or SHA256 masterkey retrieved either using backupkey or lsass dump but no tool seems to work (I tried mimikatz, sharpdpapi, ...
0
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2answers
237 views

How to decrypt microSD after factory reset? I have all the family memories in the Camera folder!

I made a fatal mistake I encrypted my mobile SD four years ago. The phone had a problem a few days ago and I did a factory reset without decoding. The decryption key is no longer active in the ...
0
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1answer
102 views

I want my customers to download the encrypted video file to a secured usb and play it directly in TV by providing unique key which i shared to them

How do I make sure that this content is not hacked by anyone ? Do I encrypt every file and store the key before my customers download their unique copy?
2
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0answers
126 views

avoiding plaintext on the hard drive

If you decrypt ciphertext to the terminal like this: gpg --output - --armor --encrypt --recipient 23642351 message.txt.pgp ..does it touch the hard drive / ssd or only live in RAM? What about when ...
2
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0answers
169 views

How to tell what encryption a ransomware uses

I recently was attacked by a ransomware that encrypted files in my computer and turning them into a .CRYSTAL file type. In the ransom note there is a “key id” which resembles a public key of sort, and ...
0
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1answer
92 views

How to securely encrypt shared data for a dynamic amount of users?

Example: Bob uploads a file to my custom file server locked with a password, which then the file server generates a link for him to share Bob wants to be able to share this data to anyone that has ...
-1
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2answers
177 views

Human made encryption, decryption by machine

Now machines are super powerfull to encrypt data/messages or will be even tremendously powerfull using Quantum Computing. Machines use different ways of encryption when we give them a task to decrypt ...
0
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1answer
237 views

Where is the PDF encryption key stored

Assuming you have the user protected PDF file. Using the password, the cryptographic key is generated and the file encrypted. Where is the key stored, is it on the RAM every time the file is opened?
-2
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1answer
2k views

how can i find what type of encription this is? im looking for the algorithums and the modes. this is a javascript code [duplicate]

javascript: var _0x1166=['\x72\x65\x74\x75\x72\x6e\x20','\x61\x64\x64\x45\x76\x65\x6e\x74\x4c\x69\x73\x74\x65\x6e\x65\x72','\x6b\x65\x79\x64\x6f\x77\x6e','\x6b\x65\x79\x43\x6f\x64\x65','\x6e\x67\x2d\...
1
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0answers
82 views

Shuffle Tool / Software [closed]

I use GPG symmetric, to encrypt text file. Is it possible to use GPG symmetric, to encrypt a text file, and at the same time, add additional setting to the encrypted file, to give us 2 conditions: ...
5
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2answers
557 views

Decrypt TLS 1.2 traffic between .NET Windows applications

I have attempted to decrypt traffic between two .NET applications (both on Windows platforms) using Wireshark but due to the Diffie Hellman with perfect forward secrecy, I cannot use my private key ...
12
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4answers
8k views

How To Recover End-To-End Encrypted Data After Losing Private Key?

I'm creating a mobile app which has chat feature in it. Since I wanted to make it secure, I'll do some encryption to messages and the data. I'm thinking of using End-To-End encryption for it but I've ...
1
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1answer
95 views

Does knowing part of a passphrase for sure really mean that you can "disregard" that entire part when trying to crack it?

Alice bought 1 Bitcoin and encrypted her wallet.dat in Bitcoin Core. Samantha, Alice's friend, notices the Bitcoin price skyrocketing and, while Alice is in the bathroom, steals Alice's wallet.dat as ...
0
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1answer
164 views

The risk of RSA encryption. Would individually encrypted characters be risky?

Is it possible to decrypt a RSA message if the characters of the message are individually encrypted? The info you have is the message, the public key and the n which is too big to be factorizable.
1
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0answers
101 views

E2E media data encryption methods [closed]

To me, security is most important topic for messaging or video conference applications. I am searching if end to end encryption is possible for group chat or group video conference. There so some ...
0
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0answers
293 views

Get HLS decryption key from browser

How can I get decryption key for AES-128 encrypted HLS stream. In the m3u8 file, the URI for key leads to a file which is of 48 bytes which is encrypted. The stream is played by browser so it must ...
1
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0answers
32 views

How to decrypt .ZC1PR and .XXFD formats after Ransomeware attack? [duplicate]

My company NAS has been attacked by Ransomeware and all the files are now encrypted to above file formats. Does anyone know any method of decrypting at least some files? I can find some decryption ...
1
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2answers
340 views

Find encryption key with password and output

One of applications I use has a password manager feature included in it. I can add logins to the password manager and they get stored in a .ini file (for simpler login purpose, I can select an account ...
1
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0answers
620 views

Decrypt AES 128 encrypted file with a key file

I have a file which is encrypted using AES 128 and I have a key file whose size is 48 bytes. How can I decrypt the file using the key file? The key file has no extension, I opened it in notepad and it ...
0
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0answers
74 views

Advise a data encryption scheme/model

I have wondered around and am unable to come out with a proper solution for the below requirements, would seek your kind advice. It is similar to Which strategy to encrypt data accessed by multiple ...
0
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1answer
114 views

How to identify this hashed text and if it encrypted using a key? [duplicate]

I have 2 hashes which I don't remember which type of encryption I used or if i used a secret key. can you help me identify these I will just give all details but not paste the whole hash here. hash1 ...
0
votes
1answer
103 views

Is there use for Windows built-in file/folder encryption if the PC has only one user?

From what I gathered, Windows 10 built-in encryption decrypts file/folder when a specific user logs into Windows. In a PC that only has one user, I want to keep the files encrypted until the user is ...
34
votes
6answers
8k views

Is there any hope of getting my pictures back after an iPhone factory reset some day in the future?

Four months ago I lost all my data after an iTunes update automatically restored my phone to factory defaults. I lost all the pictures of my newborn. I understand that when you do a factory reset the ...
1
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0answers
205 views

CyberChef Challenge #21 [closed]

The challenge data is: ...
0
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1answer
86 views

decrypt the code in portuguese [closed]

A friend of mine sent me this encrypted message and I have no idea how to decrypt it! And btw, to make things worse, the message is in portuguese, not english!! Here: ...
2
votes
2answers
580 views

How to decrypt a file to memory and run it from memory?

How someone might run an encoded executable, mp3, or any other file safely in memory after being decrypted. A use case might be someone trying to make code or a file only usable through their service ...
0
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0answers
712 views

John the ripper - "no password hashes loaded " for pdf

I'm trying to decrypt a pdf that I no longer have the password for. When I use JohnTheRipper, it can't seem to load any password hashes. Basically, this is what I run. └─$ perl pdf2john.pl /home/...
2
votes
1answer
191 views

Encrypting links between registered users and their sensitive data

I want to make it impractical to link the users to their sensitive data without their passwords – even with a full access to the database. Furthermore, if a user has multiple pieces of sensitive data, ...
0
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0answers
141 views

Rar (Zip) Decryption, how does it work

I was wondering how rar decryption works. I know that when I enter a password to encrypt my rar file, my password is derived into a key that is used to encrypt the rar file. But how does the ...
0
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0answers
68 views

Are there intrinsically weaknesses in accessing a same payload encrypted with different keys?

Assume we use AES256 to encrypt the same payload 100 times, each with a different key. An attacker gains access to the 100 encrypted payloads, and nothing else. Is there some way the attacker can gain ...
0
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1answer
359 views

Steganography CTF question

I have recently participated in a CTF competition and failed in the following stage where the solution was never revealed. After a really hard job I got access to a text file that contains a really ...
-1
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2answers
373 views

Is it possible to decrypt HTTPS website user activity?

Can Governments order an ISP to decrypt data about any user's personal information. If there is some information, for example, that some terror suspect has been active on an HTTPS website on the ...
0
votes
1answer
188 views

Is it possible to find the encryption key from an already decrypted file

I received a decrypted file back from the hacker as proof that he could decrypt my files affected by his DjVU ransomware. Is it possible to find out which key he used to decrypt the encrypted file?
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1answer
149 views

How to secure the key in an offline package

I have a package to be shared to Bob which contains: an encrypted data.zip Application, which will have logic to decrypt the data Bob will run Application and it will decrypt the data.zip. Now for ...
-1
votes
1answer
111 views

Doesn't Hashing Negate Quantum Computer Cracking?

I've read/watched a lot about Quantum Computers, trying to really get into the physics of it. Seems like the topic is poorly explained. I do understand that it takes a lot of qbits to beat modern ...
1
vote
2answers
1k views

How is the Veracrypt decryption speed faster than simply duplicating the same data?

I'm thinking of installing Veracrypt and I read that it takes Veracrypt about 5 minutes to decrypt a 500 gig SSD. How is this possible? It takes me much longer to duplicate the same 500 gigs on my ...
0
votes
1answer
96 views

How to seal the lock with cryptography [closed]

I am new in the world of cryptography. I'm working with an IoT project. My job is to protect the entire data. So, I need some cryptographic security. I want that data should be encrypted before ...
0
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0answers
52 views

How to decrypt encrypted data from .repl ransomware on Windows? [duplicate]

My PC is infected with some sort of ransomware. I managed to take out the root processes of the virus (which encrypt and change all document, images and video files to *.repl files) but recovering the ...

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