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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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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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 ...
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1answer
41 views

VPN and authorization [on hold]

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
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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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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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 ...
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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 ...
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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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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 ...
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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 ...
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1answer
37 views

How to encrypt or store data so that only a pool of processes can share it on Windows?

I am writing an application T1 which is using SQLite database to store some sensitive data and i am trying to encrypt it securely. The issue i am facing is that i don't want my symmetric key to be ...
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1answer
32 views

How is an epsilon of 1/1000 non-negligible?

Lately I've been studying cryptography and in the current course I'm taking we're reviewing statistical tests and how they can be used to determine if a pseudo-random generator is secure or not. ...
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59 views

Ensure that a file can only be decrypted after a specific condition is not present

Are there any cryptographic schemes/protocols that would allow me to encrypt a file, make it publicly available, but ensure that it can only be decrypted when a specific condition is not present (I ...
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31 views

Update certificate in Outlook contacts [migrated]

How can I update an encryption security in Outlook contacts? I got an email signed with an updated certificate by someone who is already in my contacts with an expired certificate. If I REPLY to ...
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67 views

Could other people steal my Internet connection if they had my PPPoE data?

Would it be possible for other people to use my PPPoE data to get Internet access or is it somehow restricted to my house? Then what about my neighbors downstairs, could they do it? And what about ...
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23 views

What type of security does Gazzang zNcrypt provide?

We have just planned to implement the same in our organization, and I believe this will encrypt files and data on disk. I have two questions: Does it provide column level encryption in database (if ...
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35 views

Hashed master password and generated encryption key in a password manager program

I'm writing a WPF password manager application to practice programming, so far this is the scheme I intend to use to store master password and individual site password: Master password: Generate a ...
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95 views

Is facebook to facebook (mobile application call ) encrypted?

I understand facebook uses WebRtc to send voice data packet in network if any one end client is on the browser. Use of DTLS packets can be seen in captured (wireshark) file. But in case of mobile app ...
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45 views

Designing a security system for road pricing

It's my first semester with Information Security and I still feel a little lost. Sorry in advance for stupid mistakes I may have made. the examples in round brackets below are my own ideas, wrote ...
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1answer
60 views

SQL Server Asymmetric Encryption Keys

I have used SQL Server database with data to be encrypted and I will use symmetric key for encryption and will encrypt it by asymmetric key now comes the question how to give user permission to ...
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1answer
144 views

Prevent CryptoLocker on Server

A quick question, which may have a not-so-quick answer - Are there any ways to prevent files associated with CryptoLocker, to be propagated to a data server, by means of a back up? We use Cobian as ...
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2answers
284 views

Bitlocker without TPM with both a startup USB and password?

On a Windows 8.1 Pro PC without TPM, how can I use Bitlocker with both a startup USB drive and password? I don't have the option to use both of them, is this possible via command line? Currently, ...
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2answers
54 views

Security devices other than firewall and IDS [closed]

I was just studying about firewalls and IDS/IPS and had a doubt. Are these the only two major security devices that a company invests in? or are there other equipment and security controls?
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31 views

Is it secure to store EC2 User-Data shell scripts (encrypted using S3 SSE) in a private S3 bucket?

I have an EC2 ASG on AWS and I'm interested in storing the shell script that's used to instantiate any given instance in an S3 bucket and have it downloaded and run upon instantiation, but it all ...
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33 views

How do TSC (TKIP sequence counter) calculate into WPA?

I'm reading about 802.11, from IEEE's pdf (IEE pdf), from page 1191, and in particularly I'm reading about TKIP. And to decrypt and to encrypt used a TSC (TKIP Sequence Counter) as you can see in ...
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2answers
134 views

What options exist for authenticated full-disk encryption?

Title says it all really. I'm toying with the idea of storing some disk images in "the cloud", but am concerned about the possibility of an attacker manipulating cipertext to do evil things once it's ...
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2answers
90 views

Determine Security Of A PDF File [closed]

How do I find the exact encryption on a PDF file? I can't seem to get a direct answer on the net. For example how do I tell if a document is PDF 1.1 - 1.3 (Acrobat 2 - 4), PDF 1.4 - 1.6 (Acrobat 5 - ...
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1answer
73 views

Decrypting encrypted traffic with hacking an app [duplicate]

I am thinking how does telegram ensure that messages are secret. I understand they use the public key to encrypt and private key to decrypt. Why is it not possible for an attacker to download the ...
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24 views

Securing decentralised cloud scaling

Approach Require a certain percentage (quorum) of nodes to agree in order for my decentralised multicloud to grow. Benefits Reduced likelihood of growing too quickly (e.g.: 2 new nodes created ...
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1answer
103 views

Are there any alternatives to EFS for transparently encrypting the contents of a folder in Windows?

EFS is not an option for me because I'm using Windows 7 Home Premium. I am looking for folder encryption, not drive encryption.
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1answer
85 views

Safely encrypting data received through HTTPS

I am receiving sensitive data over an HTTPS connection and need to store this on disk, encrypted so no one can tamper with it, but for reading later on. Each user in the system has a password. The ...
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1answer
115 views

What are the best practices to store payment processor dev/API keys?

I am integrating with multiple payment processors which have their set of public/private keys. This would be used in conjuction with per user keys, to bill clients. I was wondering what is the best ...
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26 views

Cryptsetup using TPM? [duplicate]

Does cryptsetup uses TPM? or CPUID to identify the hardware environment in order to prevent it from stealing and crack it on other PC.
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0answers
20 views

Why encrypt client<->server on top of TLS? [duplicate]

I want to implement TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384 between my client and my server. However, someone advices me to add my own encryption&digital signature on top of it (adding a suite of ...
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129 views

“gpg” vs “openssl rsautl” (asymmetric keys) for credentials storage

I'm working in a PHP project and need a better solution to store credentials to a client's database, and I'm thinking about encryption, I put to work both gpg and openssl using asymmetric keys, but ...
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0answers
21 views

Difference between Kerberos and GDOI?

What is the difference between Kerberos and GDOI, I know first is more toward authentication and latter is more toward multicast key management, can I use Kerberose protocol in GDOI for server and ...
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0answers
23 views

KeePassX and Dropbox [duplicate]

I am currently using KeePassX on Linux to allow me to have a different strong password for each website. With this program there comes two major inconveniences: I lose access to everything in the case ...
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0answers
91 views

Brute-forcing a RSA private key password vs. LUKS volume

I need to store various private keys for my clients. Given these options, what would be the least prone to brute force attacks: Encrypt the private keys using a separate RSA key (each user get its ...
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0answers
45 views

Implementation of AEAD_AES_256_GCM and AEAD_AES_128_GCM ciphers in secure RTP

I am in the process of implementing AEAD_AES_256_GCM and AEAD_AES_128_GCM ciphers in secure RTP. There is a mechanism in RFC 5116 to implement the algorithm, but I am not able to find any sample code ...
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0answers
88 views

Implementation of IDEA algorithm in MATLAB

I need to implement IDEA (international-data-encryption-algorithm) in MATLAB. I have thoroughly searched in different pages and forums but couldn't find the implementation details. I also tried to ...
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0answers
28 views

TLS fallback when only one protocol is enabled

Consider I have IE with ONLY TLS 1.2 enabled. TLS 1.0 and 1.1 are disabled. (And SSLv2,v3) I have a server that only supports TLS1.2, with 1.0 and 1.1 disabled as well. Assuming they share a ...
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0answers
20 views

Chrome/Youtube says incorrect certificate for host? [duplicate]

Why my Youtube always ask me: Incorrect certificate for host. The server presented a certificate that doesn't match built-in expectations. These expectations are included for certain, high-security ...
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0answers
24 views

Synchronizing secret codes on two different devices? [duplicate]

I was reading an article about how keyless entry systems for automobiles prevent people from recoding the signal and replaying it to open someone's car. In the article they describe the process as ...
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1answer
127 views

Two-factor encryption model [closed]

Please some on help me to understand this "Are you ready for this? With the two-factor encryption model your data is protected two-fold. First, a unique key is generated, encrypted, and turned into ...
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0answers
35 views

I forgot my ZIP file password. How do I bypass the encryption? Which software would work? [duplicate]

Should I use brute-force attacks? Do they even work? What options do I have? I only remember short fragments of the password and it's definitely more than 7 characters long.
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1answer
55 views

How does a keyfile work?

I was looking at some code on codereview that is far out of my league of understanding and just screwing around, but it raised a question. This program (along with many other encryption programs, i ...
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0answers
71 views

Secure password transfer from stdout to another window

I am currently trying to build a little, secure password manager. As of now, I've implemented the encryption. Each website has its own file and each file has a number of fields (Most commonly username ...
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1answer
176 views

Storing encrypted data for offline use

A user downloads a file from a server. I want to store that file locally on the user's machine so they can view offline. For protection, it should be encrypted while not being viewed. My theory is ...
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2answers
137 views

Why do I have to use multiple Keys for each direction and purpose?

I'm currently writing an examen about 'Lessons Learned in the IT-Security'. I already found some thing, which shouldn't be done. But right now I'm in trouble finding the reasons why not to do so. ...