initialization-vector

问题 I'm trying to encrypt(and decrypt after) a file using AES in CBC mode and Crypto++ library Here's what I already did: using namespace CryptoPP; AutoSeededRandomPool rnd; //generating the key and iv SecByteBlock key(AES::MAX_KEYLENGTH); rnd.GenerateBlock(key, key.size()); byte iv[AES::BLOCKSIZE]; rnd.GenerateBlock(iv, AES::BLOCKSIZE); To encrypt a file,I open it in binary mode,and dump the content to a string : std::ifstream fin(file_path, std::ios::binary); if (!fin) { std::cout << "error"; }

问题 I'm trying to implement AES in Java and this is the code I use: byte[] sessionKey = {00000000000000000000000000000000}; byte[] iv = {00000000000000000000000000000000}; byte[] plaintext = "6a84867cd77e12ad07ea1be895c53fa3".getBytes(); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(sessionKey, "AES"), new IvParameterSpec(iv)); byte[] ciphertext = cipher.doFinal(plaintext); cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec

问题 I am about to use the following script to encrypt and decrypt some data. I am using it because my current encryption does not work on our new server. We are currently using mcrypt so I want to change to openssl. In our database we use aes encryption which uses a 128bit key so I know what a key is, but I do not know what an openssl iv is? And why would I need a key and an iv. The code I am about to use is this, which I found on a website because I don't understand encryption very well.

问题 I'm implementing and AES encryption engine for PBE in android, and I've found two ways to implement the creation of the IV and I would like to know which one is better and more secure for getting IvParameterSpec : Method #1: SecureRandom randomSecureRandom = SecureRandom.getInstance("SHA1PRNG"); byte[] iv = new byte[cipher.getBlockSize()]; randomSecureRandom.nextBytes(iv); IvParameterSpec ivParams = new IvParameterSpec(iv); Method #2: AlgorithmParameters params = cipher.getParameters(); byte[

问题 per my question Aes Encryption... missing an important piece, I have now learned that my assumption for creating a reversible encryption on a string was a bit off. I now have public static byte[] EncryptString(string toEncrypt, byte[] encryptionKey) { var toEncryptBytes = Encoding.UTF8.GetBytes(toEncrypt); using (var provider = new AesCryptoServiceProvider()) { provider.Key = encryptionKey; provider.Mode = CipherMode.CBC; provider.Padding = PaddingMode.PKCS7; using (var encryptor = provider

问题 I am looking for a way, to encrypt a password in CryptoJS and then decrypt it in php. I have looked at other posts concerning the same subject, but I need someone to explain all that IV and key stuff. My CryptoJS encryption code: password = document.getElementById("usrp").value; password = CryptoJS.AES.encrypt(password, <?php echo '"'.$_SESSION['adk'].'"'; ?>); 回答1: IV You're using the CBC mode of operation which requires an IV. If you use a static IV for all your ciphertexts then you miss

问题 This question already has answers here : Good AES Initialization Vector practice (8 answers) Closed 3 years ago . I understand the IV should be random and XORed with the plain text to start the encryption. My question is, in addition to the key, do I have to remember the random IV as well for decryption? 回答1: The IV needs to be random, but does not need to be secret. Usual practice is to prepend the IV to the cyphertext before transmitting it. When decrypting, use the first 16 bytes of the

问题 I am trying to use AES GCM encryption mechanism provided by OpenSSL in C++ and using example on this link as reference: https://wiki.openssl.org/index.php/EVP_Authenticated_Encryption_and_Decryption However, following statement gives me error: /* Set IV length if default 12 bytes (96 bits) is not appropriate */ if(1 != EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, 16, NULL)) handleErrors(); The error that I get is: error: ‘EVP_CTRL_GCM_SET_IVLEN’ was not declared in this scope". I do not

问题 I'm trying to decrypt a base64 string which has been encrypted with aes256 in openssl. I was given the session key and IV, which were encrypted with my key. I converted them to hexadecimal so that I can use the following openssl command: openssl enc -d -aes256 -iv iv.hex -K sessionkey.hex -in message.b64 -out message.txt I get the error saying the IV is a non-hex value. I started out with IV and session key in base64, which was encrypted with my key. So I did the following: //convert base64

问题 I get the following error when I try to create a IV initialization vector for TripleDES encryptor. Please see the code example: TripleDESCryptoServiceProvider tripDES = new TripleDESCryptoServiceProvider(); byte[] key = Encoding.ASCII.GetBytes("SomeKey132123ABC"); byte[] v4 = key; byte[] connectionString = Encoding.ASCII.GetBytes("SomeConnectionStringValue"); byte[] encryptedConnectionString = Encoding.ASCII.GetBytes(""); // Read the key and convert it to byte stream tripDES.Key = key;