Questions tagged [decryption]

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

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144 views

AES-556 encryption/decryption algorithm [on hold]

A ransomware called STOP(DJVU) encrypted my files with AES-556 and used the .kvag extension. After a lot of searching, I tried to use STOPDecrypter many times but it is restricted to a group of ...
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7 views

No secret key error [migrated]

Im using Control-m to facilitate a transfer from a vendor. I use Kleopatra to generate a key pair and then give the public key to the vendor to encrypt and send us files. Every time I test ...
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38 views

How to save the IV if using AES GCM for big files [migrated]

i am trying to use AES GCM for decrypting files (small and large files) on Android. I have tried to do it like this tutorial https://proandroiddev.com/security-best-practices-symmetric-encryption-with-...
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45 views

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
70 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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17 views

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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21 views

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
108 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
115 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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131 views

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
224 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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42 views

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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1answer
85 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
174 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
148 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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92 views

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
115 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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86 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
68 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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2answers
259 views

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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47 views

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
120 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
153 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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420 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
220 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
339 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
155 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
444 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 ...
3
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1answer
243 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
265 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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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
69 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
353 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
106 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 ...
2
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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
567 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
81 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
51 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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0answers
216 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
1k 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
116 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
1k 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
246 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
298 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
1k 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
609 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
76 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
69 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 ...