The Advanced Encryption Standard (AES) is a symmetric-key encryption standard adopted by the U.S. government. The standard comprises three block ciphers, AES-128, AES-192 and AES-256, adopted from a larger collection originally published as Rijndael.

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Android - recover encrypted images

I have nearly 0 understanding of encryption, I just want to recover my old photos. In my old Android phone I used a certain photo-video locking app to encrypt my images. Images were stored on SD ...
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27 views

Hiding symmetric key inside encrypted data

My server generates an AES encrypted file which when downloaded acts as an input for an application. So, should I hardcode the symmetric key inside the application or should I randomly generate the ...
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35 views

VeraCrypt secure in public?

I have made a Veracrypt Containment that uses AES to encrypt everything inside. But my question is: can I securely put the containment file in public (everybody can access it) without anybody able to ...
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1answer
46 views

AES or Serpent-Twofish-AES [closed]

I want to encrypt my private stuff like credit cards, money, RSA private keys (and so on) but I don't know if I should use AES-256 only or in combo like Serpent-Twofish-AES (I am using Veracrypt). ...
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0answers
26 views

Is there any reason to use AesManaged over DPAPI in this scenario?

I have a situation where my web application is going to be deployed on multiple web servers, and I'll be wanting to store some securely encrypted data on the DB servers (each web server has a DB ...
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45 views

How Secure is my Application?

I have created a little application in .NET that serves as a loader for my other applications. Essentially, when opened, this app will get a list of available applications, and when an option is ...
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15 views

Are there “standard” formats for storing GCM output?

The openssl enc -aes-256-gcm command is broken, because it can't decrypt its own output, otherwise I would look to that as a format. In order to decrypt a file, code needs to be able to separate the ...
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3answers
45 views

Is it possible to wrap and export RSA private key in FIPS 140-2 Level 3 compliant hardware?

I would like to do the following on FIPS 140-3 Level 3 certified cryptographic token using PKCS#11: Generate RSA key pair on token Import AES key from multiple components Wrap and export RSA private ...
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33 views

Encyption Key Storage and floating point encryption

I am working on a web application where I need to encrypt some fields based on user configuration and display the decrypted information. The field values can be text or integers or floats. We are ...
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1answer
45 views

Simple open-source file encryption tool

I want to securely encrypt files, with an open algorithm. So, i've constructed the simple openSSL shell command. How secure is it? function aes-enc() { openssl enc -aes-256-cbc -e -in $1 -out ...
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84 views

rainbow table for AES 256 CBC knowing IV, cipher text and plain text

I'm in a situation where I know that I have to decrypt a file encrypted using AES 256 CBC and I've the following details: I know the first 16 bytes block in plain text I know the IV (static 128 bit ...
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22 views

How is Tresorit client-side encryption key stored and managed?

I am using Tresorit on Mac OS X and iPhone. When I am using it there is always applied client-side encryption before posting the file to cloud. The key used for encryption is AES-256 and CFB mode of ...
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1answer
83 views

Creating a private key with OpenSSL and encrypting it with AES GCM

My goal was to create a private key and to encrypt it with a strong cipher. That key would be used as a root certificate for an internal Certification Authority. However, eventhough openssl supports ...
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15 views

Can AES IGE be parallelized? [migrated]

As far as I know in AES IGE each block depends on the previous one. In that case can it be parallelized. Is there some way to do it??
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1answer
63 views

How strong is the performance impact of signing when using RSA_AES_256_ECDH

To encrypt web communication, I use SSL with a RSA key with a length of 2048 bit, AES key's with a length of 256 bit and the ECDH-algorithm for the negotiation of the AES key's (or to exchange the ...
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0answers
20 views

CCM instead of key wrap

Is there any instance of NIST or other encryption standards using AES-CCM to encrypt/authenticate key data? I would like to use CCM over a keywrap function, but cannot find any precedent for this in ...
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1answer
37 views

Change the preferred algorythm from AES to Camellia in an existing PGP key [duplicate]

I already created a PGP key-pair in Thunderbird Enigmail on Ubuntu. Now I would like to change the key, so it uses preferably Camellia-256 for encryption. How can I change the preferred algorithm ...
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3answers
210 views

Calculate time taken to break AES key

A 256 bit AES key is required to be broken using the brute force method on a 2GHz computer. How long would it take to break the key in the best case and in the worst case situations? Assume that 1000 ...
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1answer
77 views

is encrypted body http secure

I'm working on an embedded project that needs to communicate with a server. Both the server and the device have an AES key pre-installed. I have a network device that provides http services but not ...
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1answer
38 views

Sanity check security scheme, is it secure? Is there cruft?

This article: Life in a post-database world: using crypto to avoid DB writes Prompted me to write this url-crypt Node.js module to convert a Secret into secure urlsafe base64 strings. Think of an ...
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2answers
138 views

AES encryption on embedded device: Can this be secure?

I plan to create an encryption program for an embedded device with the following characteristics: CPU is Intel 80186 compatible @ ~20 MHz 128 KB RAM, of which I have ~20 KB at my disposal for ...
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1answer
73 views

Is it possible to prevent an attacker from capturing my WI-FI handshake on WPA-2 AES?

For quite a while I've been experimentally hacking wireless routers by capturing handshakes and Decrypting them using oclHashcat on my computer. even the most complicated passwords won't take longer ...
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2answers
160 views

What is the point of AES key wrap (with JSON Web Encryption)?

I'm looking at JSON Web Encryption (JWE) and am left a bit confused about why you would use AES key wrapping. The document even talks about using matching key algorithm strengths: Algorithms of ...
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34 views

What is the benefit of adding data encrypting key then store it (encrypted) along with data

To protect user's sensitive data, I am considering the following 2 approaches: Create 1 data encrypting key (DEK) for each user, use it to encrypt (using AES CBC mode with a random IV for each ...
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1answer
75 views

AES 256 bit key to plaintext conversion? [closed]

I'm a little rusty on cryptography, but I have successfully acquired a 256 bit key that is used for encryption and I want to know if it is possible to reverse it into its corresponding plain text ...
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1answer
45 views

Undelete-secure AES software and software for carrying out “full undeletion” free-partition-space zeroing/reformatting on Windows?

It is fairly well known that on Windows, when you delete a file (or folder which may contain any number of files and subfolders possibly containing other files and subfolders and so on), Windows just ...
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1answer
52 views

SSL over self-implemantation of RSA?

I currently write a client application which communicates with a PHP server. The application itself requires valid user credentials and get all of his information by doing POST requests to the PHP ...
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1answer
99 views

Using AES in CTR for TCP/IP based network connections - need to encrypt the IVs?

For AES based encryption on TCP/IP connections, I am guessing I have to do the following: Have the 2 parties share a common key, assuming I am doing AES-128 then a sequence of 16 bytes. Ideally the ...
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1answer
40 views

Extract a key from an AES black-box?

I'm trying to figure out how a given executable works. I know it's using AES-128 to encrypt and decrypt, but the specifics of the code are unknown. I can get the executable to encrypt and decrypt any ...
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1answer
69 views

Encrypting files securely using user supplied password

I'm currently trying to build a (sort of) secure, desktop based RTF text editor written for node-webkit using node.js. Based on some answers that I read here, such as How can I securely convert a ...
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2answers
120 views

Encrypting USB traffic: Is RSA necessary for AES session key exchange when using pre-installed secret keys?

I need a solution to encrypt USB communication between device A and device B. I was thinking about configuring each device with a secret RSA-2048 key, which would be used to exchange an AES-256 ...
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1answer
71 views

Is it safe to combine AES with TLS?

Given that two clients want to sync data through a server, is it safe to use AES to encrypt the data and TLS to communicate with the server? Assumptions: Server has never access to unencrypted data ...
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31 views

AES and message properties

An active attacker changes the ciphertext which was made using the AES cipher algorithm. Which message properties are preserved even though that change was made. Choose one of the below: 1) Integrity ...
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74 views

HMAC + AES to guarantee secrecy and integrity?

As an exercise, I am writing some code that accepts a list of possibly secret properties (e.g. user ID, password, IP address), adds a timestamp, encrypts it, and signs it. Here's a high-level ...
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2answers
181 views

Are credit card number look ups more secure with a hash function than with a deterministic encryption algorithm?

I understand PCI DSS 3.0 allows hashes of cardnumbers to be stored separately from encrypted values, but I'm startled at the efficiency of tools like hashcat in discovering card numbers from hashed ...
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0answers
51 views

Cryptographic Testing

Given an algorithm (say, AES), how to create/generate test vectors? I have tried using the NIST test vectors for AES and found it to be working fine with a package of "chilkat". Suppose, for a ...
3
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1answer
55 views

What encryption and signature systems (don't?) allow for plausible deniability of the OP's key being used?

I need to prevent Mallory from blindly matching encryption and signing keys to messages Hypothetical scenario: A user creates a public key An encrypted or signed payload exists. With only public ...
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2answers
313 views

How easy is it to crack gpg with private key, but without password

I was wondering if an adversary have your private gpg key but not the password/phrase, how easy/difficult would it be to crack a encrypted file compared to a encryption that only use password and not ...
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3answers
1k views

Does the entire AES encrypted dataset have to be present to be 'cracked'?

I am implementing an AES 256 algorithm on credit cards and I am wondering if I would be strengthening or weakening the encrypted dataset if I split the dataset and persisted it in two locations. I ...
2
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2answers
128 views

A secure way to encrypt a connection between 2 clients securing against both passive and active adversaries

Recently I got interested in encryption and the methods behind them. So for a fun / school project I am building a program in python to encrypt data between two clients (chat and files). I'm just ...
3
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1answer
69 views

Do I have to use an IV when using GPG with AES 256?

Do I have to use an IV when using GPG with AES 256? Or does GPG handle that for me? I've noticed that I get different results each time I run the encryption, i.e. gpg --symmetric --cipher-algo ...
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85 views

Why do we need salt and RFC in generating AES encrypted message

I'm not very familiar with encryption and new to this, I'm just learning it right now by code review of one of the class we have in an application to encrypt a password using AES. Would anyone explain ...
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2answers
272 views

Understanding Java Security Providers

I'm hoping to use the below issue we came across recently to better understand Java's security providers, ciphers and encryption in general. We got the following error during an SSL Handshake (using ...
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1answer
186 views

How come PBEWITHSHA256AND128BITAES-CBC-BC violates the 128bit key limit?

In my Java application (which use StandardPBEStringEncryptor by jasypt), when i use the PBEWITHSHA256AND128BITAES-CBC-BC algorithm instead of something weaker such as PBEWithMD5AndDES, i get an ...
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1answer
117 views

Is there an AES 256 LUKS encryption option in Fedora? [closed]

I have certain information on my drive that I don't want anyone (not even me ;) ) to gain access to. I read recently that Fedora only offers EAS 256 LUKS encryption. This just isn't secure enough ...
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2answers
85 views

Storing AES password for verification

I was wondering if such practice would be safe: I have a table that stores encrypted notes Every note has a data field and a password field When a password is entered, i want to select all notes, ...
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1answer
196 views

Real time application of AES and DES [closed]

I am writing a paper on reducing the power consumption of security protocols. I am having trouble identifying sources that describe real-time usage of DES and AES, and how often they are used. I plan ...
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1answer
590 views

AES 128bit decryption using a key longer than 16 bytes

I got a little problem regarding AES decryption. I have to decrypt some text that has been encrypted using 128bit AES / ECB with PHP mcrypt. The thing is, the key that is being used to encrypt/decrypt ...
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1answer
185 views

Keyboards using 2.4GHz with AES

I got a Microsoft Sculpt keyboard, as it seems to be a small improvement over the much loved Ergo 4000. (What I'd give to have an Ergo 4000 with CheryMX Blues...) On various sites, they have this one ...
3
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1answer
109 views

Encryption and HMAC with the same password

I need to send authenticated ciphered messages by using a single password. Reusing the same (derived) key for the block cipher and the HMAC is not a good practice, I know. My initial idea is to ...