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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Is it insecure to provide a hash of an AES password?

I have made some software that encrypts and decrypts files using AES. I was wondering if it is safe to write a hash of the password to the file so that the program can check if a password is correct. ...
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5answers
342 views

How do malicious software encrypt victims' files?

Encrypting a file to me is take the contents of the file and dealings with it as a very long string, feed it into the hashing or encryption function to get an other long encrypted sting (or a hashing ...
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0answers
21 views

Reformatting drive from a GUID partition to an MBR partition [migrated]

I understand that Truecrypt is not compatible with an GUID partition but that is the limit of my knowledge. I am currently using a system that has a GUID partition but doesn't have bitlocker ...
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1answer
63 views

Why am I getting the message that Security Stack Exchange is only partially encrypted? [on hold]

I realize that this is an information website but it does concern me a bit that I'm getting the message that this website does not supply ownership information. Does this mean that my posts can be ...
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3answers
61 views

Best method for securing text based messages [on hold]

If I wanted to use a device for the sole purpose of sending and receiving text based messages, could it be done so that the messages from A to B are as secure as possible, the information is easily ...
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2answers
133 views

Is storing encrypted data in a database futile?

The way I see it: there are two ways to encrypt data for a web app. 1) Store a single encryption key on the server, and use it to encrypt / decrypt data at runtime. The obvious issue here is that if ...
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0answers
11 views

Requirements Placed on a User of a FIPS 140-2 Validated System

Per customer requirements, I am working with a FIPS 140-2 validated network switch that is actually running in FIPS mode. This guarantees that any cryptographic operations the device performs will be ...
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2answers
74 views

Could a compromised root CA impersonate any SSL certificate?

My question is about MITM attacks against https and how those would appear to the end user. Suppose a trusted root CA were compromised / coerced into producing fraudulent SSL certificates. What would ...
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2answers
53 views

Methods to keep an autonomous log with high integrity

I'm writing a .NET desktop application that is used to send orders to a server via a REST API. To avoid leaking of our authentication token I have made it so that, when used for the first time, the ...
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2answers
98 views

Is it feasible/possible to have encrypted data that looks unencrypted/innocuous?

i.e., could I send "Let's rob the store at 9 tonight" so that it is impossible to see what I'm saying, but it doesn't look like gibberish and obviously encrypted?
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1answer
36 views

Identify encryption algorithm for .enc files

I need to identify the encryption algorithm used to encrypt some files. I have the key, but I can't decrypt it using OpenSSL, because I don't know what algorithm was used to encrypt it. Is there any ...
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15 views

Sharing Derived Unique Key Per Transaction (DUKPT) Base Derivation Key (BDK) with a partner

Assumptions: We have devices out in the field injected with keys derived from our one and only BDK. The devices encrypt data using the injected derived key. All our devices connect to our server ...
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26 views

Understanding Key Serial Numbers (KSN) in Derived Unique Key Per Transaction (DUKPT)

I have a number of questions regarding Key Serial Numbers (KSNs) in DUKPT: KSNs are 8 - 10 bytes long. Older implementation are 8 bytes whereas newer ones are 10 bytes. Do I risk being incompatible ...
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1answer
44 views

Is it true that breaking into the https padlock settings on a web page is easy to do? [on hold]

I found some posts on this forum that explained that https settings are possible to crack. see here. Why is it possible to sniff an HTTPS / SSL request? And here is another post that mentions ...
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3answers
95 views

Securely storing bank account details in database

I am developing a service that will involve the direct debit of customers' accounts on a routine (weekly, monthly, etc.) basis, and so I'll need to store their information (BSB/routing number and ...
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1answer
31 views

Decrypting SSL traffic for Security Onion at or before the interface

I have Security Onion installed and doing full packet capture on my home network. I also have a firewall (pfSense) which does my routing. I have Security Onion sitting just behind my firewall and ...
1
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1answer
32 views

Secure connection between two clients with shared secret

I am creating a system where there are multiple clients, each of which has a secure connection to a central server which could pass out shared secrets to each of them. I could be wrong, but I am ...
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0answers
33 views

Can't encrypt email [on hold]

My friend has a problem described here: https://gpgtools.tenderapp.com/discussions/problems/18790-cannot-encrypt-an-email But the solution provided by this link did not work. What else can he try? ...
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1answer
53 views

Cloud-based IM protocols / services saving messages encrypted on server which is decryptable only by user? [on hold]

I am looking for a cloud-based (i.e. not end-to-end) secure IM protocol or service. The first one comes to my mind is telegram. Here is a quote from telegram's privacy policy: Cloud Chats ...
0
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1answer
43 views

VPN and authorization [closed]

I wonder, if one should implement two factor authorization and encryption in a client-server solution, how is it done? Of course there can be many ways but some examples would be great. I imagine the ...
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1answer
23 views

Is it possible to assign different UIDs to subkeys for the purpose of having multiple identities?

Many people advocate generating new primary keys for each identity they wish to have. For example, creating one primary key and associated subkeys for workplace use, and a completely different ...
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1answer
43 views

How to securely derive a second password specific to an user

I'm giving each of my users an unique Blocktrail wallet that is protected by two API keys (which the server knows) and one passphrase (unique to each wallet). I want the wallet's passphrase to be ...
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1answer
26 views

Machine readable, user non-readable - XML file

I need some advice as I have been unable to find anything useful via the web - (Google search). I have used the application EventGhost so as to create a custom shell, that I run using the Windows 7 ...
2
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1answer
40 views

Can you use ssh for secure inter app communication on the same device?

I use ssh to get an encrypted connection between servers and local machines all the time. It's fast, it's secure, and there's a way to do it in nearly every system programming language that I've used ...
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0answers
21 views

Create Incremental/complete backups from a disk encrypted using TrueCrypt? [migrated]

I have a tricky question about whole disk encryption and its backups particularly TrueCrypt for which I have never found a great answer What method do you recommend/use for create automatic backups ...
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1answer
21 views

Evaluating encryption/promised anonymity of message service [closed]

This is a question that in my opinion should be able to be generally answered, and not just discussed. I therefore hope some discussion will lead up to a straight answer. Scenario: A website X ...
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1answer
80 views

Check HMAC after completing decryption or before?

I have written a piece of software that symmetrically encrypts big files (multi-megabyte). Plaintext is encrypted, after the encryption the HMAC is calculated and written into the header of the file. ...
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1answer
71 views

How to determine if mail was encrypted during transport using the header information?

First things first: I know about the difference between end-to-end-encryption and transport encryption. Back to topic: I already read some things about how mail server handle transport encryption, ...
2
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0answers
27 views

Security implications of providing an encryption/decryption oracle

I need to provide a service that acts as a symetric encryption/decryption blackbox : the box get a secret key k users send datas d, and get ciphertext c = Encrypt(d,k) users send ciphertext c, and ...
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0answers
18 views

SSLException: Unsupported record version Unknown-84.84 [migrated]

I'm facing a weird issue on our server that happens intermittently not quite often (once a month) and can't figure it out. I've searched for this and found this thread which is pretty similar to my ...
0
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1answer
26 views

Getting multiple key matches on plaintext/ciphertext pairs in double DES

I'm trying to implement a Meet-in-the-Middle attack and just to test it out I've done some hardcoding of values, which is simply this block of simple code: byte[] key1 = new byte[] { 0x20, 0x00, ...
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2answers
150 views

Is there a way to securely store unsalted passwords?

So, obviously I'm not talking about username/password pairs here, I plan to store passwords with two salts and three hashes, but what occurred to me is that if I had a table where I kept pairs: ...
2
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2answers
202 views

My Virgin Media account password is visible in plaintext to call center staff. What do I do?

Whilst on the phone to support staff (about billing) to Virgin Media, perhaps the largest ISP and telecoms company in the UK, I was asked to confirm my password over the phone. I asked the advisor ...
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0answers
32 views

Is there a solution for On-the-fly-encryption with active directory rules & policies?

I am looking at having our servers' sql databases for a few program and documents to be always encrypted on the HDD, but available to AD users. So one or multiple users with the right AD privileges ...
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0answers
32 views

How to mount a truecrypt container with noatime? [migrated]

I'm using the TrueCrypt GUI on Ubuntu and I don't think there's an option for specifying mount options in the interface. I want to use noatime, because it reduces writes to the disc. I have seen the ...
2
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1answer
64 views

How to send an encrypted mail only knowing the PGP fingerprint?

How does one send an encrypted email with PGP, when he only has the recipient's fingerprint? I am already sending emails using PGP, but I've just pulled a contact's PGP fingerprint who I need to ...
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2answers
146 views

Is it safe to auto-fill credit card numbers using Chrome?

Is it safe to auto fill credit card numbers using Chrome? Does it safely store the credit card information? As far as my understanding goes, it just shows asterisk values but on click it reveals the ...
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0answers
46 views

Truecrypt system encryption in legacy mode and UEFI [migrated]

I just recently got my first UEFI board and installed Windows 7 in legacy mode. This new system is encrypted with Truecrypt's system encryption feature but UEFI kind of startles me anyway. First of ...
2
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0answers
63 views

Is it possible to do Public Private Key Encryption on a chip (hardware)?

Does a chip exist which will take input data and output encrypted data in a public private key scheme, where the public key is on the chip and the private key is located remotely? The ultimate goal ...
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2answers
41 views

AES algorithm encryption time

What is the time taken by an AES Encryption algorithm, with a key of 128 bits, operating on a normal computer (say with Intel i7) and what will be the impact be on the time if I wish to use a 256 bit ...
2
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1answer
72 views

UEFI and security implications for encryption

After my old PC kicked the bucket I now own my first UEFI board and I am already having trust issues. I utilized Truecrypt's system encryption for years now and really got used to it. My new board has ...
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0answers
20 views

2DES vs. two-key triple encryption, with no decryption step [migrated]

So studying double encryption (double DES) and understanding why it is subject to a Meet-in-the-middle attack, I tried to see if the same attack could be applied to a triple encryption with only two ...
1
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1answer
33 views

CryptoAPI to CommonCrypto with RC4

I have cryptographic code used in the Windows platform, which uses the Crypto API functions and need to convert this to using Common Crypto on OS X. Essentially the original code is this, with error ...
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0answers
34 views

Theoretical VPN and Tor Encryption Chain

Okay, so I've been looking around at the benefits of using tor to access you vpn and vice versa. Here's what I've come up with: VPN -> Tor Pros: Hides Tor usages from isp Hides your activities ...
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votes
1answer
59 views

what is the best security application to check if someone has copied my files with a usb and how to stop that [closed]

I need an encryption application that will detect who has accessed my files from my laptop via a usb and also to help me block memory sticks to access my files and laptop without my permission.
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0answers
46 views

Encrypted Drive. Forgot password. Remember parts of it. Less than 15 characters [duplicate]

So I forgot my password to an encrypted drive (encrypted via Truecrypt 7.1a) and I remember parts of it. I know that there's "12345" in it and the entire password starts with J. how do I restore it ...
0
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1answer
89 views

Is it secure to not expire keys in symmetric encryption?

Note that this question describe hypothetical case, that is never meant to be used in real world. Server communicates with clients with message structure: client_id, initialization_vector, encrypted ...
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1answer
77 views

Is this process a secure way for users to login? If so, is there a name for it already?

I thought of this process specifically to stop "man in the middle" attacks and replay attacks: User types their username into the client application. Client application sends the username to the ...
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0answers
41 views

Is there an encryption scheme that allows an auditor to view some, not all data?

I want to create an online chat room allows for privacy, freedom of speech, and for law enforcement to protect citizens from violent behavior. I think the best approach is to use Shamir secret ...
2
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1answer
32 views

Saving Authentication Tokens to Third-Party Websites

So Flickr allows you to authenticate users to your app via app_key and secret and returns an authentication token. I want to securely save that authentication token in my database, but also be able to ...