aes | 易学教程

bytes in 'str = new String(bytes, “UTF8”) ' and 'bytes = str.getBytes(“UTF8”)' not the same value

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问题 I can see they are different than the bytes I created the string with! I have used "AES/CBC/PKCS5Padding" to get the string. public static void main(String[] args) { try { int randomNumber = CNStationQueueUtil.randInt(0, 99999); String key = "AES_KEY_TAKENUMB"; byte[] bytes = EncryptHelper.encrypt(key, String.format("%%%d%%%d", 1001, randomNumber)); String str = new String(bytes, "UTF8"); System.out.println("str = " + str); System.out.println(); byte[] utf8Bytes = str.getBytes("UTF8");

How to communicate AES initialization Vector to client for hybrid cryptosystem

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问题 I need to implemented security for client-server communication. I have implemented the following hybrid cryptosystem To encrypt a message addressed to Alice in a hybrid cryptosystem, Bob does the following: Obtains Alice's public key. Generates a fresh symmetric key for the data encapsulation scheme. Encrypts the message under the data encapsulation scheme, using the symmetric key just generated. Encrypt the symmetric key under the key encapsulation scheme, using Alice's public key. Send both

Cocoa encryption plain text?

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I'm working on an encryption application that for now encrypts text-only files. I need some help in the connections and how to go about the actual encryption. I received this snippet of code to encrypt a file, but I am a bit confused. What I need to do is have a button (encrypt) that takes this text file and encrypts it. Am I supposed to extract the contents of the file first, then encrypt it? How so? The program must know what file has been selected so it encrypts it, and I'm a complete noob right now, and I need some help. Step by step instructions would be greatly appreciated. This was the

What is the difference between Aes and AesManaged

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问题 I found two class in C# related to AES , and example code of them MSDN provides are similar, what is the difference between these two classes? Aes Class https://msdn.microsoft.com/en-us/library/system.security.cryptography.aes(v=vs.110).aspx AesManaged Class https://msdn.microsoft.com/en-us/library/system.security.cryptography.aesmanaged(v=vs.110).aspx 回答1: System.Security.Cryptography.Aes is an abstract class, representing merely the concept of AES-ness. AesManaged , AesCryptoServiceProvider

AES decrypt fails with “Padding is invalid and cannot be removed”

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I am making cross-platform application with server being written in Java, so I ended up with C# for Windows. I finally got through all obstacles like different endianities for BigIntegers in these two languages (Java: big endian, C#: little), so I successfuly made key-exchange as well. Now this is where problem comes, in Java I use AES/CBC/PKCS5Padding for encryption, but in C# there was no PKCS5 available, but as I read in other posts to this topic here on SO, PKCS7 is told to be same as PKCS5 or that Java really uses PKCS7 instead of PKCS5. I don't know what's correct. So this is the code:

Java/Kotlin Encrypt AES key with private and public key

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问题 so I lately saw a video from computerphile where they said that when using encryption you should be using AES keys and encrypt this key with public and private key. This means: I have a public key from someone else, and my own private key. The reason behind encrypting it with your own private key is, that this verifies that the message has to be comming from me, because no one else has my private key, so encryption with my public key can only work on messages comming from me. Problem is that

OSX AES Encryption is not working

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问题 In my application, i need to encrypt the file before sending it over the network and on the other end, it will get decrypt, This is my code, -(void)doEncryptTest:(NSString *)pFileName{ // read the NSData; NSStringEncoding encoding =NSUTF8StringEncoding; NSString *pFileContent = @"xaaaaaaxxaaaaaax"; NSString *pKey = @"01234567012345670123456701234567"; NSData *pData = [pFileContent dataUsingEncoding:encoding]; NSData *pEncryptedData = [pData AES256EncryptWithKey:pKey]; NSData *decrypted=

Why are these square symbols appended after decrypting with bouncy castle?

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问题 I have created a simple java method that encrypts and decrypts text using the bouncy castle library. Encryption works as expected but when I decrypt something I get these extra square symbols at the end: I think this might be something to do with padding but I've followed the example featured on bouncy castle's website, so I really can't understand why I would be getting this sort of output. Here is the code I am using: [Main] public static void main(String[] argv) { String ciphertext =

OpenSSL AES 128 CBC \0 crash enrypted char*

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问题 I have problem with OpenSSL AES ( I use aes.h ) : get binary file (.pdf , .jpg ) or some .xml , .txt about 5000 chars , then i enrypt base64. When I try enrypt AES i get bad size ( Random 400 , 200 , 50 ) , my AESKey is random 128bits from chars : [abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 ,.-@#&*oeOE¯_ ] I think that problem is '\0' enrypted char but i don't know can I extort entry (string can save char array with \0 element but unsigned char* and char* is aborted ) this

AES Encryption Not Working Properly in UWP

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问题 We have an C++ application where it encrypts password using AES algorithm through openssl API's ( EVP_EncryptInit_ex, EVP_EncryptUpdate, EVP_EncryptFinal_ex ). Now I try to develop UWP application through which I want to do same authentication as the above legacy app does. But when I'm using API's from "Windows.Security.Cryptography" my authentication fails as the encrypted data output is different from the legacy app, so decryption fails and there by authentication. Legacy app uses one Key