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Search found 379 results on 16 pages for 'cryptography'.

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• If attacker has original data, and encrypted data, can they determine the passphrase?

  - by Brad Cupit

  If an attacker has several distinct items (for example: e-mail addresses) and knows the encrypted value of each item, can the attacker more easily determine the secret passphrase used to encrypt those items? Meaning, can they determine the passphrase without resorting to brute force? This question may sound strange, so let me provide a use-case: …

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• Any alternatives to signedCMS.decode on windows?

  - by JL

  Unfortunately .net functionality using cryptoAPI does not work reliably enough for the task I have. Is there a direct equivalent way for me to decode a signedCMS on windows, using anything other than signedCMS.decode cryptoAPI functionality or CNG. Thanks

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• What exactly is a "key container"?

  - by saugata

  Is it something specific, with a definite structure, or just an arbitrary data file with some form of encryption to hold keys, and potentially other secret information? Can someone please explain the term or point me to a link.

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• When is it safe to use a broken hash function?

  - by The Rook

  It is trivial to use a secure hash function like SHA256 and continuing to use md5 is reckless behavior. However, there are some complexities to hash function vulnerabilities that I would like to better understand. Collisions have been generated for md4 and md5. According to NIST md5() is not a secure hash function. It only takes 2^39th…

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• How to calculate MD5 Hash of an Array of strings in C++ using Crypto.h library in Linux ?

  - by Dhruv

  Hello friends, I have an array of strings.. I want to calculate the MD5 hash of these strings and want to store them in another array using Crypto.h library in C++ in Linux... So can anyone tell me how to do it? give some exapmle or sample code..

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• How to specifiy key size in the CertCreateSelfSignCertificate function

  - by sako73

  I am using the function CertCreateSelfSignCertificate (http://msdn.microsoft.com/en-us/library/aa376039(VS.85).aspx) to generate a certificate. I need to specify the key size to be 2048. I do not see how to provide this parameter. I would appreciate any help in this matter. Thanks.

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• Crypto++ AES Decrypt how to?

  - by indigoOrange

  There are next to no noob guides to crypto++ out there. Or none that I've found anyway. What I want to do is decrypt an array of uchars I generate with another AES encrypter. Where would I start? I have the library built and linking grand. Do I need to set anything up or do I just call a function on my array (and if so what function) ? I'd…

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• Is EAX crypto mode supported in the .NET framework?

  - by Sean Gough

  Does anyone know if EAX mode is supported or how to use it? Here is an overview: http://en.wikipedia.org/wiki/EAX_mode

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• Is there a standard way to run a x509 key server?

  - by chotchki

  Does anyone know of a project / product that has standardized how to access/download x509/SSL certificates over HTTP? I have seen RFC 4387 but haven't found anyone who implements it. Basically, I am trying to setup a key server for an internal application. So short of implementing my own, does anyone have any suggestions?

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• Suggest a best algorithm to encrypt XML file in C#.NET ?

  - by karthik

  I have to encrypt XML file and send in network to place in a private server. My other application will decrypt and import to SQL the file by giving the actual Public key. Could you please suggest me best way for this. File: XML Type Possible size: Up to 250 MB Technology: C#.NET 2008

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• Anyone know about Jasypt (Java encryption library)?

  - by Spines

  From googling I found Jasypt, I'm wondering is it reliable? Anyone know about it?

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• How can I create an authentication cookie, but w/o asp.net formsauthentication?

  - by Blankman

  Do we know the algorithm that asp.net uses to create the authentication cookie (when using forms authentication?) Can we basically create our own copy implementation? if so, how? What does it use to generate the encrypted cookie value, I know it uses whatever you pass into the SetAuthCookie call (which is usually the userID/username).

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• Does LuaCrypto run on Windows?

  - by fpinheiro

  I need to run LuaCrypto on win platform. Does anyone know how to do it?

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• Bouncy Castle provider don't work in Linux Ubuntu

  - by Tom Brito

  I've successful installed Bouncy Castle in a Windows environment, but the same steps isn't working for Linux Ubuntu (V9.04). Does anyone know any difference from installing Bouncy Castle in Windows and Linux? Or any bug with Bouncy Castle in Linux Ubuntu 9.04?

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• Length of Encrypted String

  - by Agnel Kurian

  I need to create a database column which will store a string encrypted using Triple DES. How do I determine the length of the encrypted string column? (Answers for algorithms other than Triple DES are also welcome.)

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• Why can't we just use a hash of passphrase as the encryption key (and IV) with symmetric encryption algorithms?

  - by TX_

  Inspired by my previous question, now I have a very interesting idea: Do you really ever need to use Rfc2898DeriveBytes or similar classes to "securely derive" the encryption key and initialization vector from the passphrase string, or will just a simple hash of that string work equally well as a key/IV, when encrypting the data with…

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• Why RSA Decryption process takes longer time than the Encryption process?

  - by Tara Singh

  I have some idea that it is due to some complex calculation, but i want to know about what exactly happens which takes long time than the corresponding encryption process. Any link to webpage or paper would be of great help. Thanks Thanks for the answers, One more Doubt, What about the Signing and verification? Will this time…

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• Hashing and salting values

  - by Avanst

  I am developing a small web app that internally authenticates users. Once the user is authenticated my web app then passes some information such as userID and Person's name to a third party web application. The third party developer is suggesting that we hash and salt the values. Forgive my ignorance, but what exactly does…

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• Best practice for secure socket connection.

  - by LnDCobra

  What is the best practice for a secure socket connection (without SSL). I will be moving sensitive data (logins/passwords/accounts) across TCP Socket connection, and wondering if there is a good/fast way of Encrypting/Decrypting and avoiding malicious injection.

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• Why is using a Non-Random IV with CBC Mode a vulnerability?

  - by The Rook

  I understand the purpose of an IV. Specifically in CBC mode this insures that the first block of of 2 messages encrypted with the same key will never be identical. But why is it a vulnerability if the IV's are sequential? According to CWE-329 NON-Random IV's allow for the possibility of a dictionary attack. I know that in…

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• License key pattern detection?

  - by Ricket

  This is not a real situation; please ignore legal issues that you might think apply, because they don't. Let's say I have a set of 200 known valid license keys for a hypothetical piece of software's licensing algorithm, and a license key consists of 5 sets of 5 alphanumeric case-insensitive (all uppercase) characters.…

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• What is the best nuclear missile crypto system?

  - by The Rook

  You are on a submarine and there is an encrypted message that you want to read. Two people must use their keys at the same time in order to obtain the plain text. What is best cryptographic primitive to use? Are the following two implementations suitable? plain_text=decrypt(Key1 XOR key2,ciper_text,IV) …

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• What is this (C/C++) program doing?

  - by guitar-

  It's calling these API functions (advapi32.dll) with these parameters: CryptCreateHash ( 3275488, 32771, 0, 0, 1243424 ); CryptHashData ( 3203040, 'UY30930037661', 13, 0 ); CryptCreateHash ( 3276304, 32771, 0, 0, 46463812 ); CryptHashData ( 3203296, '-585164138661', 10, 0 ); CryptCreateHash ( 3276304,…

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• For AES CBC encryption, whats the importance of the IV?

  - by Spines

  What is the security threat of always using all zeroes for the IV? If it allows the encrypted text to be deciphered, how could an attacker do that?

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• node.js: encrypting data that needs to be decrypted?

  - by fancy

  We are using bcrypt for passwords and data that never needs to be decrypted. What should do to protect other user information that does. For this example lets say that we didn't want a users real name to be in plain text in case someone was to obtain the db. This is somewhat sensitive data but also…

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