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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using crt for encrypting files/texts [duplicate]

I work with GPGTools under Mac where, after creating a public/private key pair for myself, I usually get .asc from other users, import it and then I'm good to go. Now, I got an actual certificate from ...
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128 views

What web browsers support ECC vs DSA vs RSA for SSL/TLS?

We are updating our wildcard certificate and see that we have the option to use both RSA or DSA with Symantec (for free), while Digicert offers 3 options for wildcards ECC, DSA and RSA. Is there a ...
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1answer
216 views

Decrypting SHA-256 with known plain text

If i have a SHA-256 hash and I know what could be the crypted string is it possible to decode it faster? Lets say I know the string is formed like this : %d-%d-%d-%s %d being numbers from 1-25 %s ...
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73 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
40 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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3answers
268 views

Completely encrypting virtual machine (for free) [closed]

I know in VMware workstation there's the option to encrypt a virtual machine. Is there a free way to do this without VMware workstation? I'm aiming for the fullest encryption and encapsulation ...
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3answers
89 views

encryption vs access control comparison

I have a very basic and simple question about two security concepts. Both encryption and access control are used for privacy and to prevent unauthorized users from accessing some object (eg. files, ...
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98 views

Was TRESOR integrated in the Linux kernel?

If a computer is switched off, the data can stay in RAM memory for a while; decaying over about 5 minutes. This can be made longer by cooling the chips: ...
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152 views

Can symmetric key cryptography provide identification?

I understand that PKI uses digital certificates to link a public key to an entity, but is there anything similar for symmetric cryptography. If, theoretically, PKI didn't exist, how do you know you ...
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3answers
447 views

Any reason not to encrypt a 32 byte value by XORing it with a PBKDF2 hash?

Ordinarily I'd use PBKDF2 to generate a key which i'd use with AES. But seeing as the hash is going to be as long as the data I need to encrypt is there any disadvantage to just XOR'ing it? My ...
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3answers
59 views

GnuPG symmetric encryption yields different output

I have a use case where I want to commit symmetrically encrypted source code using GnuPG (think of Coursera assignments for backup and collaboration). I encrypt/decrypt all sources in a batch with a ...
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1answer
95 views

Moving /tmp to an encrypted tmpfs

BLUF: I'm using an SSD on my system, so my primary reason to use tmpfs to increase the life of my drive by moving high read/write files to volatile memory. But from a security point of view, I'd also ...
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14answers
9k views

Ensure that a file can only be decrypted after a specific date

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 after specific date? I assume it would be ...
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1answer
100 views

IoT Devices and 39 Month TLS Certificate Life

I develop IoT (Internet of Things) devices on small embedded systems, where it is very difficult to update the local certificate once they have been deployed. It really needs to be avoid if it can. ...
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1answer
24 views

Encrypted Traffic Test in Mobile

how to check the SSL/TLS encryption of my mobile application.is there any way to check and watch encrypted traffic in my cell i m using android phone..is there any procedure to check the encryption ...
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6answers
2k views

Encrypting With Passwords - Encryption of Key vs. Data

Many password-based encryption utilities (e.g.: KeePass, TrueCrypt) do something along the lines of... Encrypt data with super-strong random-generated key, "data key". Encrypt data key with another ...
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3answers
2k views

Is it truly possible to store passwords securely, but be able to see the password?

Every place I looked, people recommended that storing passwords via encryption is like storing passwords in plain text. But every place I've looked, everyone recommends using a password manager like ...
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1answer
100 views

Analyzing a TLS connection?

Suppose I want a secure TLS communication between me and myschool.edu. Which of the following should I trust to preserve confidentiality, integrity, and authenticity. Here are the options and my ...
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1answer
214 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
59 views

Are there any problems associated with using the same encryption key for multiple systems?

I have multiple computers, tablets, etc. If I have a very secure key, is there any problem with using it to encrypt all of my systems? I can remember 1 or 2 secure keys without writing them down. But ...
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2answers
849 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
49 views

Internal access to security sensitive data in a company

I'm building a software that requires a lot of security for the data. The user data in essence is very sensitive. So we are building a lot of encryption, 2 step authentication, app call tokenization ...
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2answers
62 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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1answer
52 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
83 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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2answers
527 views

What are the differences between TPM and HSM?

TPM (Trusted Platform Module) and HSM (Hardware Security Module) are considered as cryptoprocessor, but what are the differences exactly? Does one of them have more advantages than another?
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Possible to use Cellular encryption data to validate Geolocation?

I need offline-verifiable, time stamped, GPS signals or its equivalent. Since cellular protocols include time stamps, encryption keys and other data, perhaps it's possible to re-use this ...
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1answer
100 views

How to make sure that the cryptographic hardware accelerator is being used in am335x?

I want to use the AES hardware accelerator in am335x. I was able to generate the cryptodev.ko and cryptosoft.ko drivers. From my application program I am making use of openssl apis in CBC mode, and I ...
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2answers
65 views

Can a website detect which method you are using to connect (LL2P, SSTP and PPTP)

When you connect to a website using a VPN with the same IP however using a different type of connection each time (LL2P, SSTP and PPTP) can the website detect the difference between these connection. ...
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1answer
109 views

Where to store hashes, salts, keys in Desktop Applications

I am trying to figure out where or how i should store application secrets and keys inside a desktop application. For example a facebook app key or dropbox key and secret. So I've read that i should ...
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0answers
61 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 ...
8
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1answer
756 views

How long does the system encryption key stay in RAM

The thread title says it, i would like to know how long a system encryption key will stay in RAM or CPU and will be therefore be extractable using boot attacks. I read somewhere that encryption in ...
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2answers
104 views

Crypt-analysis methods for breaking or finding weakness in an encryption algorithm? [closed]

How cryptanalysts work on an algorithm related to diffusion/confusion factors in order to find a weaknesses in an algorithm, for example how cryptanalysts could find weakness on DES? is there methods ...
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3answers
142 views

Can I initially hash passwords with SHA instead of hashing them with bcrypt to decouple requests from slow crypto functions?

I'm using bcrypt for some web service requests that hash multiple passwords. The problem is that these web service requests can take minutes to complete due to bcrypt. Not very user friendly. My ...
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5answers
167 views

Does publishing the md5sum of a private key compromise the private key in any meaningful way?

If I have a 4096 DSA private key used for signing binaries, and I want to ensure that a partner has an identical server using the same private key, can I send the md5sum of the private keys over an ...
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1answer
86 views

How is the username and password captured on this mobile device?

I have a Motorola phone, and I am concerned about my privacy after reading this article : http://www.beneaththewaves.net/Projects/Motorola_Is_Listening.html The poster says: For both of these ...
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2answers
66 views

Consequences of putting a serial number into an AES key

I have an embedded device with a secure memory of only 128 bits. I have to store the serial number (16 bits) and the AES key (128 bits) into this space. What are the consequences of putting the 16 ...
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41 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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1answer
59 views

Can a mobile phone be induced to fall back to 2G comms?

http://techcrunch.com/2015/02/25/gemalto-2/ So, a bunch of SIM card keys were most likely stolen, but Gemalto claims that this would only affect 2G networks. Supposing all that is true, it's still ...
2
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3answers
120 views

Maintaining data security in motion with SSL

I am hosting with a HIPAA compliant hosting company, as we are required to do because of the industry I am in. We have a BAA executed with them, and their responsibility terminates at the application ...
5
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2answers
204 views

Files encryption for flash drive privacy/security

Looking to encrypt files on flash drive (for backup) just in case it gets stolen or lost. Don't want to install any extra software like TrueCrypt but instead just use what's already on most computers. ...
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1answer
43 views

Search Engine security for searches associated with the same searcher [closed]

A number of years ago AOL leaked potentially identifiable information, because all of the searches leaked were associated with the same 'user', and as such they could be put together to identify the ...
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2answers
98 views

Is it a secure encoder and hasher?

I want to ask if my code secure or not. if this is not secure please tell me the reason. This code is mixed of Rjindael-256, base64_encode and SHA-512. function xencoder($input,$key) { $salt = ...
5
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2answers
116 views

PKI/Why does Microsoft require my cert before encrypting an email?

Microsoft doesn't allow sending public-key encrypted messages using Outlook 2003-2012 on Windows 7-8x environments without first creating your own Digital ID or private key for signing. Per ...
7
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1answer
235 views

Linux Plausibly Deniable File System

Is there any way to encrypt a linux filesystem in such a way to maintain plausible deniability? E.g. "Hidden OS support," the way Truecrypt and Veracrypt work, they only support Windows OS due to low ...
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2answers
140 views

How can an attacker identify the encryption method with only ciphertext?

Assume that attacker only could obtain ciphertext, but knows that method is symmetric. Is there a way to find which algorithm was used for the encrytion? And in general, if attacker knows the ...
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1answer
61 views

Encoding Same Message with Different IV (AES/CBC)

Let's say I encrypt a message using AES/CBC twice, with the same key but two different IVs. Is this safe? Or can the resulting ciphertexts be used against each other to obtain information about the ...
6
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1answer
564 views

can multiple encryption of data with multiple keys increase the security?

I mean: does encrypting data multiple times have an effect on diffusion and confusion? Does it increase security, or does it have no effect? Is it useless? Does it make it harder to break the secret, ...
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3answers
108 views

Prevent MITM between custom phone app and local server

We're building a Wifi enabled device. The device will be installed locally on each client's office and people in the the small office will connect to this Wifi enabled device, They will send/receive ...
5
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1answer
220 views

Showing bank routing/account numbers, and storing them safely

EDIT: This is for the UK/Europe region. I've been scratching my head reading other posts similar to this one about safely storing bank routing and account numbers. I know that routing numbers can be ...