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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Where can we learn more about recursive encryption schemes?

I've been wondering about recursed encryption. The idea I'm trying to convey here is an encryption scheme where a message is encypted, then somehow encrypted again, and again, etc. The encryption ...
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1answer
898 views

Is Data Object on openPGP smartcard v2 encrypted?

currently I thinking about on-the-fly disk encryption using Truecrypt/dmcrypt LUKS with key stored on smartcard. I would like to use openPGP v2 smart card, respectively GPF Cryptostick which is based ...
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1answer
77 views

“If encryption has not been implemented, a comparable alternative has been implemented” [closed]

What constitutes as a comparable alternative to encryption? I know that password keepers and other services are not comparable and are not considered encryption. If the context is authorized access ...
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1answer
113 views

Can this text be figured out?

It seems that as long as a computer is connected to the network, any encryption used by that computer makes it insecure, because the computer can be compromised. I wonder if in this scenario is it ...
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1answer
84 views

I need to transfer user's private key (RSA) to my App. Is file sharing a good solution?

I've asked a similar question here earlier iOS: Is it ok to store a RSA private key (use to decrypt text) in your application document directory? However, the person recommend me to use keychain ...
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1answer
73 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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1answer
79 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
45 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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1answer
100 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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2answers
61 views

encryption protection against lost password

Here is a plan I am thinking about. I haven't seen this proposed, so I thought I would ask about it. Threat we are guarding against: A lost or stolen laptop leading to exposure of sensitive ...
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1answer
46 views

Is it possible to make a different encryption for a phone communication?

I wanted to know if maybe it's possible to make a phone communication more secure than the current A5/1 (used for GSM). Or maybe create a special tunnel between two phones. I mean like an ssh ...
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1answer
102 views

Is SQL Server 2016's Deterministic Encryption any good?

I'm seeing that MS just released a new version of SQL Server which supports deterministically encrypting a column, so that you can still query it: ...
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1answer
316 views

Decrypting .P7M File with Key (.pem) using OpenSSL

My knownledge about security is limited so I need some help here. The Question I want to Decrypt a .P7M file using its private key (.pem). I would prefer to use OpenSSL for this. Tried so far ...
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2answers
138 views

Can I VPN a phone's connection to my home network, and then apply my home firewall to my phones network connections?

I have a decent firewall/router at home, and I was wondering whether it would be possible to use my home firewall for the connections that my phone makes, even when I'm not at home. It would mean ...
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1answer
42 views

SQL Server Format-Preserving encryption

I have old system with database that has table with column of type char(20) and the customer decided to encrypt that column for some business needs however for some system integration needs the ...
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2answers
2k 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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1answer
55 views

Distinguishing between tokens and actual PANs for tokens based on reversible cryptographic functions

I’m researching a possibility of implementing KEK and DEK servers compliant with PCI-DSS requirements. PCI Tokenization Guidelines states: “The tokenization solution should include a mechanism for ...
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1answer
93 views

Risk of temporarily unencrypted data during transmission between systems

I have encountered a situation where sensitive data files are saved unencrypted to server file directories temporarily for 1 to 30 minutes before being sent to a destination application. The data ...
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1answer
116 views

How to pick an encryption algorithm (cipher) and mode for PHP's mcrypt, for encrypting passwords?

There are numerous algorithms listed in the PHP documentation: http://php.net/manual/en/mcrypt.ciphers.php How strong is each one and what criteria to use when picking one? Also the ...
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1answer
68 views

What is the “segment size” when using Cipher FeedBack (CFB) chaining mode?

When using CFB chaining mode with AES, I see instructions that the "plaintext length (in bytes) must be a multiple of segment_size/8" (also mentioned here). What does that mean?
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1answer
75 views

Using randomly generated numbers to authenticate with a Relay server

I'm developing a public VoIP relay server, that will help bypass internet firewalls by allowing two clients to connect with it and then it will relay data between the two. Both clients will connect ...
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2answers
161 views

Storing unencrypted, confidential data in client memory

I am currently working on a service which lets users store client-side encrypted data and access it anywhere. The client connects through a browser and the webapp is written in JavaScript. To easier ...
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2answers
84 views

Is End to End security possible without physical contact?

I noticed that a lot of messaging start to provide "End2End" security, but I wonder how this can be possible without a key exchange between the the two clients. To my understanding to provide real ...
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1answer
61 views

Feasibility of creating an in-memory web app (that runs from a CD-rom on a web server) for sharing self-destructing messages

This question is about a hypothetical in-memory web application that is used for exchanging encrypted messages that passively self-destruct in X amount of minutes. Here the messages would be stored ...
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1answer
109 views

Security tradeoffs while designing a mobile Web Service API

I'm not a security expert but I want to ask about tradeoffs in a web service API I'm designing for mobile apps. It is an API which tracks users' locations so yes, the data is reasonably sensitive. ...
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1answer
45 views

How are various softwares' files/information kept safe from me, the user [closed]

I started making a simple user authentication program just for fun, and I realised I don't know how to keep safe the files that will store all the usernames and passwords. This got me thinking. What ...
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1answer
98 views

Default Encryption - A Panacea or Placebo

I wrote this on LinkedIn - Discrete Discretion My first question is: Is it accurate to say that default encryption is a placebo? Will default encryption only make end-users think they are secure ...
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1answer
69 views

Proprietary cards [closed]

I was recently reading about automotive fare collection systems and came across loyalty card systems. In these systems, if I understood correctly, each passenger has a card in which a value, not ...
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1answer
218 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
88 views

Looking for a way to encrypt/decrypt data using a generated key that works in Windows and Linux

I am looking for a way to encrypt/decrypt data on windows and linux platforms. The data gets encrypted in windows and the same data needs to be decrypted on linux/windows and vice versa. I understand ...
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1answer
141 views

How to secure sensitive data in application with message queue

Currently we are creating one small service, where we are using some sensitive data from users(not worth zillions but to me it is like password). The idea is that application itself only inserts this ...
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2answers
94 views

Type of SSL connection used when visiting google services

I have 2 computers running chrome: a) Win 8 , latest chrome b) Win 7 , latest chrome ~ 1.5 yr old high spec laptop Both display the Certificate Authority as: Google Internet Authority G2 computer ...
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1answer
136 views

How to store passwords to a remote web site?

Say I want to build a public API to access a website that doesn't have one. The website is protected by a standard username/password scheme and the API implementation will use scraping to get the data ...
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1answer
484 views

How encryption/decryption of RSA private key by passphrase works?

I would like to know how exactly the encryption of private key by passphrase works. I am a software developer with no background in cryptography and I know only some basics. When I open the private ...
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1answer
311 views

Can you get someone's IP if you have their Skype number?

I was reading about capturing packets during skype sessions to get the other person's IP address... sounds like you can do this mainly while in a live skype chat / call between skype to skype, but Is ...
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3answers
189 views

Hardware encryption for Flash Drives

Could someone tell me the difference between Hardware encryption and Software encryption? (With regards to flash drives, if it makes any difference). From what I understand, software encryption is ...
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2answers
240 views

Lock And Unlock Files Using USB Key

I am looking for a way to make a set of files only able to be read when a USB key is plugged into the system. For example, if I have FILE A on my C drive and I try to open it, it will say something ...
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4answers
199 views

Basic question about why it's useful to have VPN encrypt traffic

There may be a basic flaw in my understanding of how the internet works so sorry if this is a simple question. What type of attack does VPN protect against? For example if a local area network (let's ...
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1answer
316 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
222 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
109 views

Storing CardHolder Data using RC2 encryption

I would like to know if storing credit cardholder data using RC2 encryption requires to be compliant with PCI DSS. Currently the 16 digit PAN number and expiry date is stored in the database. The PAN ...
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1answer
38 views

Mechanisms to prevent error propagation in wireless networks with respect to the avalanche effect [closed]

I was wondering what mechanisms exists that could be used to prevent error propagation in wireless networks and especially with respect to the avalanche effect. I know ARQ and FEC can be used, but ...
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1answer
83 views

Indexing encrypted data for efficient searching

I have implemented encryption for certain columns in a database. In some cases it may be necessary to search by these columns, either for exact matches or for substrings. At the moment, there is less ...
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2answers
190 views

Key Management/storage system

In my firm we have a couple of thousand hardware devices, installed externally, that all send back data to a central server. They send back data about every hour. Each of these hardware devices ...
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1answer
66 views

Bridge mode question [closed]

İ have an outdoor in my shop and distributing my network to customers using mac filtering opition.. one of my neighboor got a weak signal....so, he bought a wirelss repeater to recieve a better ...
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2answers
181 views

Trust level of whole disk encryption software

For example, if we take this software into account: Symantec Endpoint Encryption Sophos Safeguard Encryption How can we trust suppliers of whole disk encryption software in the lights of the ...
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1answer
168 views

Why is not safe to use the same public key in RSA?

In the RSA context, why is not safe to use the same n (public key)for different people?
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1answer
489 views

Wifi Educational Hacking - Aircrack-ng wpa vs wpa-psk

I have a question about the max amount of dictionaries need to crack a wpa2 or wpa2-psk password I am using aircrack-ng on ubuntu Is there any possible way to calculate the maximum amount of ...
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1answer
122 views

Understanding Digital Signature

I have just learned Digital Signature and am trying to ensure that I have got my understanding of Digital Signature on the correct track. Assume Alice wants to send a message (M) to Bob where the ...
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2answers
352 views

Can we hide a constant hashed key used for AES encryption of a password?

Are there any methods in java to hide a constant hashed key which is embedded in a class? FYI, the key is used to AES encrypt a password used to authenticate a Web Service which would only take a ...