encryption

问题 I am trying to write RSA encryption and decryption classes in Java for a server where the client will be passing strings back and forth. I have the following code for the classes: public class RSAEncryption { public static final String KEYGENALGORITHM = "RSA"; public static final String ALGORITHM = "RSA/ECB/PKCS1Padding"; public static KeyPairContainer generateKey() { KeyPairGenerator keyGen; KeyPair key; try { keyGen = KeyPairGenerator.getInstance(KEYGENALGORITHM); keyGen.initialize(1024);

问题 Dears, I need help to understand why decryptString doesn't work and throw "java.security.InvalidKeyException: Need RSA private or public key". When call encrypt method, i use public key by the private key/certificate. Thanks for any help! public class KeysHandler { /*** * Generate and store in AndroidKeyStore a security KeyPair keys. * @param alias - Alias to create the key. * @return KeyPair object with: private and public key. */ public static KeyPair generateKeyPair(String alias) { KeyPair

问题 Dears, I need help to understand why decryptString doesn't work and throw "java.security.InvalidKeyException: Need RSA private or public key". When call encrypt method, i use public key by the private key/certificate. Thanks for any help! public class KeysHandler { /*** * Generate and store in AndroidKeyStore a security KeyPair keys. * @param alias - Alias to create the key. * @return KeyPair object with: private and public key. */ public static KeyPair generateKeyPair(String alias) { KeyPair

问题 I am trying to use encrypt data using RSA. So far everything is fine. I can generate Private-Public keys, I can encrypt and Decrypt string successfully. Now i want stored Public key in SharedPreference. I can store it as string. I can retrieve it as string. I need to convert it to Key, to pass to cipher. Conversion from String to original format is not happening. This is what i tried KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA"); //generate key using RSA KeyPair

问题 I try to decrypt file using following command: gpg --output file.txt --decrypt file.pgp File is decrypted successfully but i get an error: "gpg: Can't check signature: public key not found" Any idea, why I get this error? 回答1: You get that error because you don't have the public key of the person who signed the message. gpg should have given you a message containing the ID of the key that was used to sign it. Obtain the public key from the person who encrypted the file and import it into your

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 2 years ago . We are doing a school project where we need to explain code line by line. We need to explain the following 3 lines: // TODO: This is where the magic of XOR is happening. Are you able to explain what is going on? for (int i = 0; i < rawString.length(); i++) { thisIsEncrypted.append((char) (rawString

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 2 years ago . We are doing a school project where we need to explain code line by line. We need to explain the following 3 lines: // TODO: This is where the magic of XOR is happening. Are you able to explain what is going on? for (int i = 0; i < rawString.length(); i++) { thisIsEncrypted.append((char) (rawString

问题 I am using AES to encrypt files. The problem first came when i tried to encrypt a large file. So i did some reading online and figured that i need to use a buffer and only encrypt bytes of data at a time. I divided my plaintext into chunks of 8192 bytes of data and then applied the encryption operation on each of these chunks but I am still getting the out of memory error. public static File encrypt(File f, byte[] key) throws Exception { System.out.println("Starting Encryption"); byte[]

问题 I am using AES to encrypt files. The problem first came when i tried to encrypt a large file. So i did some reading online and figured that i need to use a buffer and only encrypt bytes of data at a time. I divided my plaintext into chunks of 8192 bytes of data and then applied the encryption operation on each of these chunks but I am still getting the out of memory error. public static File encrypt(File f, byte[] key) throws Exception { System.out.println("Starting Encryption"); byte[]

问题 I tried to use php mcrypt TripleDES for encryption for docx format files. When i tried to decrypt the file, i am getting the error as follows. The Office Open XML file file_name cannot be opened because there are problems with the contents. Here is the below code function Encrypt($source,$key,$iv) { $cipher = mcrypt_module_open(MCRYPT_3DES, '', 'cbc', ''); mcrypt_generic_init($cipher, $key, $iv); $result = mcrypt_generic($cipher, $source); mcrypt_generic_deinit($cipher); return $result; }