cryptography

问题 When I compile my application , I get following compile error. Unable to find manifest signing certificate in the certificate store. Then I find the resolution for the above error and then try to import certificate, I am getting following error. An internal error occurred. the private key that you are importing might require a cryptographic service provider that is not installed on your system. I also check the folder option of MachineKeys in C:\Documents and Settings\All Users\Application

问题 I have an encrypted file that I am trying to decode as part of an experiment. After working hard and long, I have been able to extract the private exponent from the public key since the modulus was small: openssl rsa -pubin -inform PEM -text -noout < public_key.pem Public-Key: (64 bit) Modulus: 16513720463601767803 (0xe52c8544a915157b) Exponent: 65537 Now, I have: Factors: 3917781347 x 4215069449 Private exponent: 9440767265896423601 Now, to derive the plaintext, I need to raise each 64-bit

问题 I have an encrypted file that I am trying to decode as part of an experiment. After working hard and long, I have been able to extract the private exponent from the public key since the modulus was small: openssl rsa -pubin -inform PEM -text -noout < public_key.pem Public-Key: (64 bit) Modulus: 16513720463601767803 (0xe52c8544a915157b) Exponent: 65537 Now, I have: Factors: 3917781347 x 4215069449 Private exponent: 9440767265896423601 Now, to derive the plaintext, I need to raise each 64-bit

问题 I am trying to make an encryption using CryptoJS. The encryption seems to work fine, but when I decrypt the password, I do not get the initial plain text password. Here is my JavaScript code: <script type="text/javascript"> var password = ""; function noSsl() { $(document).ready(function() { $("#dialog").dialog({ show: 'fade', hide: 'fade' }); }); } function savePassword() { password = document.getElementById("ap").value; alert("Initial password: " + password); enPassword = CryptoJS.AES

问题 I want to encrypt some strings based on SHA1 algorithm in both C#.Net and Oracle 10g. My algorithm in C#.Net: string salt = "123"; System.Security.Cryptography.SHA1 sha = System.Security.Cryptography.SHA1.Create(); byte[] preHash = System.Text.Encoding.UTF32.GetBytes(salt); byte[] hash = sha.ComputeHash(preHash); string password = System.Convert.ToBase64String(hash); password = password.Substring(0, 8); // password value is: "7yP7/lkJ" In Oracle: Create Or Replace Function Sha1(P_Value

问题 I have a working test of a hardware device that uses RSA encryption, in Python using M2Crypto. Now I need to test a similar device that uses 3DES encryption. But I can't figure out how to use M2Crypto to do triple DES encryption. I know it should be possible from this chart. But unfortunately the documentation of M2Crypto I've found is sketchy. (The homepage at http://chandlerproject.org/ seems to be gone, along with Chandler.) I've searched for 3DES and "OpenSSL API" and found some hard to

问题 SignedCms is not supported in Windows 8 Metro. Is there an equivalent/replacement for it in WinRT? Sample of the code i need to convert to Metro below: message.Data = new SignedCms(new ContentInfo(Encoding.ASCII.GetBytes(toDigest)), true); message.Data.Decode(part.BinaryContent); 回答1: Found what i was looking for here: http://dotnetspeak.com/index.php/2011/11/encrypting-and-decrypting-data-in-winrt-2/ 来源： https://stackoverflow.com/questions/14272579/windows-8-metro-cryptography-using

问题 I'm trying to make a program that encrypts files (.jpg and .avi) using the crypto++ libraries. My aim is to make a program that successfully encrypts video files using AES-256. I did text examples of AES encryption from here and they ran successfully (meaning that the library is setup correctly). However, the following simple code produces the exception HashVerificationFilter: message hash or MAC not valid Code: AutoSeededRandomPool prng; SecByteBlock key(AES::DEFAULT_KEYLENGTH); prng

问题 Is there an implementation (Java/C++/Ruby) of a Blowfish algorithm that supports 48-bit data blocks? I have an encryption problem where the input and output channels are exactly 48-bits. All implementations on the net are for 64-bit blocks. 回答1: That's because Blowfish has a set block size of 64-bits. You could pad two random bytes to the end of your data. require 'rubygems' require 'crypt/blowfish' blowfish = Crypt::Blowfish.new("A key up to 56 bytes long") plain="123456" encryptedBlock =

问题 I need to know the cost of succeeding with a Preimage attack ("In cryptography, a preimage attack on a cryptographic hash is an attempt to find a message that has a specific hash value.", Wikipedia). The message I want to hash consists of six digits (the date of birth), then four random digits. This is a social security number. Is there also a possibility to hash something using a specific password. This would introduce another layer of security as one would have to know the password in order