Questions tagged [encryption]

Encryption is the process of transforming plaintext using a cipher to make it unreadable to anyone except those possessing the key.

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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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128 views

Which scheme provides the shortest public key, while being secure? [closed]

I was wondering about whether there exists a scheme that would have the following properties: Be asymmetric (Encrypt with public key, decrypt with private key) Be secure by today's standards (as hard ...
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I was sent this, but don't know the encryption method! [closed]

So, this guy at my university facebook group sent this: ...
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2answers
128 views

How safe are encrypted file systems and how does their updates work? [closed]

Not so long ago the media widely discussed the deciphering of the encrypted iPhone of a terrorist in the United States. Apple said it was impossible to decrypt. Edit: The iPhone was encrypted, and ...
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How to crack a docx file password [closed]

so I have a docx file protected by a password to be unlocked. I forgot the password but I was able to get the encryption information by renaming it to .zip then extracting this information: @ <...
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How long does it take to brute force a 7 character long password taken from 16 character set

A database file is encrypted with 256bits AES and the key is the first 7 characters (from the character set 0-9, a - f, all small letter) of MD5 hash . This implies 2^28 bits (268,435,456) possible ...
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1answer
108 views

Tool for reading application data before it's encrypted [closed]

For a test, I have a simple client-server Python socket-based application with a self-signed certificate. The code is copied from here. Although I don't see the traffic as TLS in Wireshark (why?), ...
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2answers
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Is there a reason to salt instead of enxrypting data? [duplicate]

Is it more secure to: a) Take a password, salt it, then hash it. b) Take a password, hash it, then encrypt it(Using a symmetric algorithm with a large key)
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679 views

What is suspected to be on the famous encrypted iPhone? [closed]

Quite a big deal is being made about Apple's refusal to decrypt an iPhone used in a terrorist attack. What is suspected to be on the device? If the crime has already been committed and the dead buried,...
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2answers
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Public Key Cryptosystem uncertainty

Can a party send plaintext (unencrypted i.e not ciphertext) to another party? Does all communication need to be encrypted as ciphertext?
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942 views

How to find an encryption algorithm between two hexadecimal numbers? [closed]

I have several numbers that are generated by a server. They are 16 digits long and are hexadecimal. I have no idea whether or not any salting or hashing techniques were used. Can I find the encryption ...
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How to store a hexadecimal string representation in C++ for use in cryptography

Homework question The full question is the following: Suppose you are told that the one time pad encryption of the message "attack at dawn" is 09e1c5f70a65ac519458e7e53f36 (the plaintext letters are ...
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How to decrypt javascript code extracted from PDF

I analyzed PDF, and extract javascript code. But javascript code is encrypted. I can't decrypt it. Please advise me. javascript code \040\040\040\040\146\165\156\143\164\151\157\156\043\164\151\...
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1answer
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US Export Laws (Encryption Cloud Service) [closed]

Okay - so I have been extensively looking into US export/import laws relating to encryption software (5D992), however I have a few questions about the laws and their applicability. So, the laws ...
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Hi My Project topic is “Implment client server communication using cryptography tool” can u suggest me a ready made tool for this?

I am a student studying basic Network information security. My project topic is " Implement client-server communication using cryptography tool". My teacher told me that there are ready-made ...
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1answer
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Is GPG symmetric (decryption) vulnerable?

Suppose a file (say, a text file source.txt) was encrypted into danger.gpg using GPG symmetric encryption on a compromised device. Since the device is compromised, danger.gpg could have been created ...
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541 views

Is it possible for the government to recover data from a encrypted ssd (veracrypt) that was wiped

Just as the title states I'm wondering if its possible for the government to recover data from a encrypted ssd that was wiped? Thanks in advance!
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Does a private key file created with a passphrase need to be decrypted before use

Let's say that I have created a private key file with some passphrase in ssh-keygen. Now someone sends me a message encrypted with my public key. To decrypt the message I need a private key. Do I ...
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1answer
286 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
65 views

Encrypt the same data with AES using strong but different passwords

I'm going to send the same piece of data encrypted with AES using strong but different passwords several time through the Internet. Is it secure or I should change something in data each time?
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2answers
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is there any solution for wannacry? [duplicate]

"wanna cry" encrypt our data within a minute. So how can they do it that much faster speed on network?? Is my file encrypted by "wanna cry" then any way to decrypt my file without sending bitcoins to ...
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1answer
463 views

How to encrypt a file? [closed]

I created my own encrypt / decrypt script and I can encrypt any kind of strings. I just need to know how can I use my script to encrypt a file like an image or a text file? My script is working in ...
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1answer
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Decrypting keys at the software application level [closed]

Does anyone know what the most common method of decrypting data is? I.e., if something is hashed and not decrypted at the firewall, how is it usually decrypted within a system? Is it integrated into ...
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1answer
391 views

SSL Server-side certificate on client computer? [closed]

There is a server with WCF client, which periodically initiates communications over internet with many WCF services installed on our clients computers. WCF services and WCF clients are hosted in ...
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1answer
218 views

Public key encryption for initial challenge-repsonse

I understand public key encryption, public key authentication, how digital signatures work and challenge-response authentication, but what confuses me is when they are all combined, and the question ...
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1answer
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How would I encrypt something like this; [closed]

I want to encrypt some very important passwords in a text document or something like it. What would I use to ensure maximum security.
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1answer
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using asymmetric encryption to encrypt private key [duplicate]

Just a small question: I know it is common for one to use asymmetric encryption in order to encrypt his private key, when using symmetric encryption. Is there a name for this process/method of ...
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What are the risks if a weak ciphers are accepted by a technology that uses SSL

The TLSSLed tool found that the host that I use has SSL connection that accepts 8 different TLSv1 and SSLv3 ciphers that are weak by their length (40 bits). How can an attacker exploit this fact?
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Asymmetric encryption algorithms [closed]

What are the best asymmetric encryption algorithms out there? I am trying to use RSA in my project howoever I have read that it is not quite secure as other asymmetric encryption algorithms.
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Development of asymmetric encryption algorithm? [closed]

I am planning to develop (make some minor changes) to asymmetric encryption (i.e. RSA). Any suggestions please?
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2answers
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Is HJXDDUDAYIZQRFGSJJ a valid one-time pad encryption of WESTERNENGINEERING? [closed]

How we can check this is valid or not? As I know in one time pad, we have key to make cipher text from plain-text. WESTERNENGINEERING HJXDDUDAYIZQRFGSJJ
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2answers
137 views

What is the absolute secure way to transport/deliver information over the internet?

If I were to deliver data across the internet(From my LAN out into the nation's WAN) What would be the absolute secure way to do it? Would it be to use a digital signature with a symmetric key?
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How to tell what encryption is being used [closed]

How do you tell encryption algorithm used by reading its output? Here is the one I am trying to figure out Åbd$ý H5ù//°t¬Û)LbÒö©ÂO�…9#x<2L#š÷EaK§èìk¼ïö«��bu]÷ÌL~ž“s�O3¬ø2œ&@é(bÜ„À𶂢‘ÙÙÿ{@...
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if i send a mail on protonmail and close account straight away is it trackable [closed]

I sent an email via protonmail. I then closed my account. Can you trace my email from this?
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1answer
292 views

Why can't hashes be reversed? [closed]

Imagine a theoretical universe where reverse hashing is possible. What if I take a 5000 bit message and hash it. So now I get a hashed string of say 256 bits. If I can get back to the 5000 bit message(...
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2answers
403 views

NTAG216 lock bytes security [closed]

I want to ask about the "lock bytes" implemented on the NTAG216 by NXP. What exactly are these and how do they work? Are they a standard or is it some proprietary technology by NXP? Are there any ...
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2answers
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how to identify plain text from cipher [closed]

I am trying to find what encryption algorithm has been used in this code original text: 11011698 encrypted text/cipher: uIC4hZFECIAYMi%20FWxamjQ== original text:11008569 encrypted text/cipher: ...
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1answer
95 views

How Secret is splitted in Shamir Algorithm [closed]

I have been reading about the Shamir Secret Sharing algorithm. While researching I am still not sure how a secret is split. So let's suppose we follow example given here. The secret is 1234 and we ...
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2answers
153 views

Is it more secure to delete emails from the server once a client has downloaded them?

From this email provider We strongly adivse people to download their email whenever possible, so as to lessen the amount of personal private data present at any time on the servers. Does this mean ...
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1answer
932 views

What is the algorithm of bcrypt? [closed]

In many places I heard that people recommend to use the bcrypt algorithm to save passwords into database while creating web applications.I want to know what is the algorithm used to bcrypt a password ...
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1answer
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Which encryption technique should be used for users name and passwords in my notebook [duplicate]

i writing all my passwords and users names on my notebook emails,amazons,facebook. and i have really Nosy little's brothers that will probably look at my notebook when i am not around, which ...
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1answer
137 views

How The Sony Hack Was Traced, and So Quickly? [closed]

What are the steps that are required to locate a source that have routed their traffic through multiple zombie hosts, spanning multiple networks/carrier/nations?
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1answer
95 views

Algorithms to store and send data

I would like to store data, and send it by mail. What is the best way to encrypt it, and being able to decrypt it? My guess would be RSA, but is there a better way? (Considering that the other person ...
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2answers
117 views

Facing hard encryption [closed]

I have a little problem with encryption. I have this cipher text "AA969CF9657F77C597C8EAFF1594D59374E4977F" and i know that correspond to "http://jogos.meo.pt/". I have another samples, but i can´t ...
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1answer
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How do I unencrypt emails from a pst file without a digital certificate? [closed]

I saved a pst file on a CD. It contains a lot of email that was sent to me using a digital signature. I am now in a lawsuit and need to print out those emails but no longer have access to my digital ...
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1answer
441 views

OTR encrypted chatroom or IM [closed]

I need a secure, encrypted environment for conducting text based interviews online. It's for academic research purposes where data protection is paramount so there cant be any data stored on 3rd ...
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1answer
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Digital Certificates, exhaustive set of their uses and references [closed]

I am a newbie of sorts as far as particulars of security is concerned.can somebody list all the possible uses of a digital certificate? it is used in SSL, signing and what else? Also is there a good ...
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Are all MD5 hash codes for different files of the same length? [closed]

My question is about if all MD5 hash codes for different files have the same length?
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3answers
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Strong file encryption for sensitive data [closed]

My first question: Our new app will work with files that contains sensitive data (e.g. finances). These files will be stored on the client first than synchronized to our server. I need a method for .....
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1answer
686 views

How secure is CryptoCat [closed]

Is CryptoCat secure? It is hard for me to determine if a program is secure or not. Let's compare them both to the programs called Wire Ricochet WhatsApp and all the other services which provide e2e ...