Encryption is the process of transforming plaintext using a cipher to make it unreadable to anyone except those possessing the key.

learn more… | top users | synonyms

1
vote
2answers
650 views

Can fully homomorphic encryption be practical?

Fully homomorphic encryption has been implemented by Craig Gentry using ideal lattices. Can it be applied to data stored on a private cloud setup in practice? I've seen references here and on other ...
13
votes
1answer
1k views

When authenticating ciphertexts, what should be HMACed?

Some have argued for using AES-256-CTR with HMAC-SHA-256 for authenticated encryption over AEAD-specific modes like EAX and GCM. However, when doing, this, what should be HMAC'd? And how? ...
5
votes
2answers
940 views

What is the purpose of the entropy parameter for DPAPI.Protect?

So in Windows, when you make a call to the Data Protection API, you can specify some bytes as "entropy". To me, this sounds like salt. In PBKDF2, the salt is can, and in fact needs to be stored as ...
13
votes
6answers
5k views

Why encrypt data in memory?

I saw that KeePass not only encrypts its password-database-file, it also can encrypt the passwords it holds in memory. This is just an example. I thinking of a new project dealing with sensitve / ...
3
votes
1answer
230 views

CMC (RFC 5272) compatible CA server

I need a CA server or any tool that supports Certificate Management over CMS (CMC) format, described in RFC 5272 (RFC 2797). I need a possibility to generate different Full PKI requests and responses ...
0
votes
1answer
316 views

How key_derivation and key_verification functions are implemented of a 7-zip archive's encryption mechanism?

I am curious about how password recovery works for password protected files. And I want to know the exact flow of the 7-zip encryption mechanism :) !! 7-zip uses the AES-256 encryption algorithm in ...
3
votes
1answer
370 views

DPAPI offline attack by cracking windows password?

I'm thinking of using DPAPI to protect configuration file information in my program. After doing some reading on it, it looks like it uses the user's Windows password as part of the encryption ...
10
votes
3answers
6k views

How secure is Intel SSD Encryption?

Are there any known flaws in the full disk encryption on Intel 520 series SSD drives? Specifically, it seems these drives generate an internal AES key automatically, even when no password is set. But ...
21
votes
8answers
3k views

Software that encrypts the data before deleting it

I am searching for a software that would encrypt data and then delete it (as opposed to just deleting or wiping). With that, even if the file is recovered, you still have to break the encryption to ...
5
votes
5answers
1k views

What's the State of the Art of Homomorphic Encryption?

I get the impression from some internet resources I have skimmed that homomorphic encryption is yet computationally very inefficient. However, an Infineon press release from 2010 says that the CPUs of ...
2
votes
3answers
357 views

Without SSL, what vantage point does one need to MITM non-SSL'd HTTP?

OK, so there are two things here: being able to read the content of the requests and responses, and then being able to modify them. The former may depend on the latter, I'm not sure. But basically, ...
2
votes
1answer
2k views

Should WPA2-AES be presumed insecure? (What is the “Hole196” vulnerability?)

I saw it mentioned in an answer here about firesheep, but I've never heard of it -- Should WPA2 be presumed insecure?
19
votes
3answers
3k views

In PGP, why not just encrypt message with recipient's public key? Why the meta-encryption?

It's described very well by this diagram. It seems like the process used is convoluted and more round-about than it needs to be. Why is an intermediate random key generated for the payload's ...
20
votes
3answers
11k views

Encryption and compression of Data

If we want both encryption and compression during transmission then what will be the most preferable order. Encrypt then compress Compress then encrypt
6
votes
2answers
4k views

Storing password in Java application

What is best secure way to store passwords in Java web application? I am not talking about password to the DB, so it must be stored in de-cryptable way. It’s cloud environment and I need to protect ...
6
votes
2answers
2k views

How do I know if my encryption algorithm is strong enough?

I am using ruby and have the following encryption algorithm: @@secret_key = Digest::SHA256.hexdigest(key) encrypted = Encryptor.encrypt("encrypt this", key: @@secret_key) encoded = ...
3
votes
2answers
554 views

Security concerns about my webapp

I read though OWASP very carefully, but I am not sure about some parts of my website. I am using jbcrypt on my website. It stores the salt in the hash itself something like this hash+salt. I read ...
4
votes
1answer
1k views

truecrypt second encryption of the master and XTS key with a back door password

this table was published by (Ubuntu Privacy Remix Team ), in an analysis document, anyway i was quite skeptical. On file based containers as well as on completely encrypted partitions or drives ...
15
votes
2answers
3k views

Does AES-192 provide better encryption than AES-256?

this wikipedia article describing AES says: Related-key attacks can break AES-192 and AES-256 with complexities 2^176 and 2^99.5, respectively. Does this mean that AES-256 is actually a weaker ...
3
votes
2answers
246 views

Unecrypted connection to server - safe?

I am using heroku and cloudflare. I am going to release my website but I don't want do it without SSL. Now I always need an heroku addon to add my SSL certificates which costs $20/month. Cloudflare ...
2
votes
2answers
6k views

How to set up a user-friendly NAS encryption?

We recently installed one NAS drive (Buffalo LinkStation Pro Duo, LS-WVL, running the most recent Firmware version 1.6 to be precise) in our (small) company network. Currently, there is no encryption ...
13
votes
6answers
18k views

Where does SSL encryption take place?

I checked the data transmission of an HTTPS website (gmail.com) using Firebug. But I can't see any encryption to my submitted data (username and password). Where does SSL encryption take place?
17
votes
8answers
6k views

Is TrueCrypt safe enough to store clear-text-passwords?

The reason: I want to be able to use a portable USB drive to access my passwords on any machine and OS. TrueCrypt seems to be the only program that has sufficient support on all major platforms. So I ...
7
votes
1answer
1k views

OpenSSL fails NIST AES-128-ECB test vectors?

I'm having trouble getting OpenSSL's ciphertext to match the NIST test vectors. Example : in "ecb_e_m.txt" from http://csrc.nist.gov/archive/aes/rijndael/rijndael-vals.zip, the first test is (in hex) ...
3
votes
2answers
27k views

Remove Password Protection from XLS Document

Similar to what is listed here, http://datapigtechnologies.com/blog/index.php/hack-into-a-protected-excel-2007-or-2010-workbook/, is there a way to remove the password from an XLS (Excel 2003) ...
2
votes
2answers
209 views

What number of bits does a browser use to generate a key?

The question comes from the accepted answer in this thread: My understanding of how HTTPS works (gmail for example) The Gmail server sends your client a certificate. The certificate includes the ...
34
votes
3answers
75k views

Understanding 2048 bit SSL and 256 bit encryption

On DigiCert's page, they advertise a 2048 bit SSL with a 256 bit encryption: http://www.digicert.com/256-bit-ssl-certificates.htm What exactly is the difference here and why are two encryption bits ...
2
votes
1answer
731 views

Encryption key token

How to securely store an encryption key in USB drive? Here is my idea. I would like to write a program (let's say PC) and it will store data to a database encrypted at the record level or field level, ...
4
votes
2answers
684 views

Can you encrypt a password using that password itself? [duplicate]

Possible Duplicate: How to securely hash passwords? https security - should password be hashed server-side or client-side? I need to make a request to a web server, the only information I ...
4
votes
3answers
334 views

Secure File Encryption/Decryption Capabilities

As a preface to my question, let me state that I'm a relative newbie in the field of security. I work for a back-office financial software provider that is responsible for processing, generating, ...
11
votes
5answers
920 views

what would be a good way for a doctor to send xrays encrypted to another doctor?

As a dentist, I often want to send medical information including digital xrays to another doctor. What would be a good/easy way to do this encrypted? Our organization currently requires that all ...
2
votes
3answers
1k views

Is SSL Tamper Detectable?

I know how SSL provides security against people reading your messages - by encryting the message with a SYMMETRIC KEY, which was exchanged during SSL Handshake with the help of ASYMMETRIC KEYS. But I ...
1
vote
5answers
2k views

making an iPhone/Android app which sends a user password to my server, how to secure?

I'm making an iPhone/Android app for my website, users already have an account on the website and the app will allow them to login. I don't have SSL on my website, but it's just a reviews website and ...
1
vote
2answers
2k views

Avast says I don't need to use encrypted connections for my e-mail accounts

I am using Outlook 2010 and Avast anti-virus 7. Whenever I add an account to Outlook if I choose to use SSL for incoming or outgoing connections Avast alerts me I shouldn't use it because Avast can't ...
0
votes
2answers
750 views

Keeping the password secret over regular http

I would like to at first be clear that this is for poor site owners who can't afford the SSL option but require logins to their site, potentially from a public kiosk, and need a secure method of ...
7
votes
3answers
2k views

Encrypt WiFi connection per connected user

One of the questions that comes on quite often is about WiFi encryption. Now imagine that you have multiple users connecting to one AP. With a simple WPA2 protection setup they can still sniff each ...
6
votes
1answer
530 views

Should password hashes be encrypted or HMACed?

Assume I am hashing user passwords with PBKDF2, bcrypt, scrypt, or some other secure key derivation function. Are there: tangible security benefits, precedents, and respected research for ...
6
votes
1answer
260 views

Could a consumer-friendly PGP-like file encryption application theoretically be secure?

In a situation where there are desktop and mobile clients, and a central public key repository to and from which the desktop and mobile clients automatically upload and download public keys as needed, ...
3
votes
1answer
149 views

How to ensure web application remains secured after intrusion of server

My application employs asymmetric encryption / decryption, the process of how this work is detailed below: Encryption - Server A Data is encrypted using the public key of server B Data is signed ...
2
votes
1answer
11k views

Why it does not matter whether you type HEX or ASCII as WEP WiFi password?

I know that I can pass password in HEX as a keyphrase to WiFi network using WEP encryption as well as ASCII. But somehow you cannot get the ASCII when you only know HEX value. Can anyone explain the ...
11
votes
5answers
3k views

Confusion: Why isn't a passhrase encrypted SSH key two factor auth?

I'm trying to figure out the best practices for accessing my devbox from a public terminal. Most sources I've found recommend protecting the box with some kind of two factor authentication, such as ...
4
votes
2answers
6k views

Is it safe to store password in PHP session?

I need to do some encryptions in the private zone of my website and I want to bcrypt the user's password. Is it safe to store the password in the session when user does the login, so that I can use ...
4
votes
2answers
561 views

Shibboleth user attribute encryption

How does Shibboleth guarantee that 3rd parties do not get access to user attributes contained in SAML 2.0 assertion exchanged between IdP and SP? Is it correct that all user attributes are encrypted ...
6
votes
3answers
5k views

Secure way to transfer public/secret key to second computer

I created a public/secret key using Seahorse (GNOME managing tool for encryption keys). I haven't had issues encrypting and decrypting files from the computer the keys are located in but I'd like to ...
7
votes
4answers
3k views

Password Vault - Enterprise

I want to be clear from the get-go that I am NOT looking for a user password management solution. My organization already uses AD for that. What I am looking for is a password vault. Up until now, ...
1
vote
1answer
231 views

Is proper documentation on .xef files available anywhere?

WinACE encrypts files (using one of its 8 methods) into a file with the extension .xef. I'd want to see some documentation on this file format but I couldn't find anything... I'm particularly ...
7
votes
3answers
495 views

How secure is HTTPS with weak ciphersuites?

Today I came across the website https://mtgox.com/, which claimed to be secure because of the Verisign certificate. I checked the certificate out of curiosity (it's the first thing they claim, let's ...
5
votes
3answers
519 views

How to store chat conversations on my website?

I am making a site where members are able to have one-to-one chats, and I'm not sure how should I process conversation texts. Should I store the text in a .txt file or directly in a database? I also ...
4
votes
1answer
183 views

How does my antivirus determine which CTL is used?

I have imported a trusted root certificate into the Windows local machine list. This works fine with my signed certificates, unless my AV (Bitdefender Antivirus Plus 2012) is set to "scan SSL", in ...
84
votes
11answers
21k views

Is there any technical security reason not to buy the cheapest SSL certificate you can find?

While shopping for a basic SSL cert for my blog, I found that many of the more well-known Certificate Authorities have an entry-level certificate (with less stringent validation of the purchaser's ...