encryption

问题 I don't know if a similar question was asked before, but I didn't find what i need. I have a table in Postgres database that contains a lot of rows and I need to encrypt one column of this table (and its relative data). In other questions found was mentioned pgcrypto to encrypt columns, but in every example a brand new table is created and pgcrypto is used for INSERT statement and SELECT. Is possible to encrypt column and its preexisting data? I hope everything is clear 回答1: With pgcrypto

问题 Is there an implementation of CTR (counter) mode of operation in the Java / C# Bouncy Castle lightweight API? 回答1: Yes, you can use org.bouncycastle.crypto.modes.SICBlockCipher . The documentation of that class reads: Implements the Segmented Integer Counter (SIC) mode on top of a simple block cipher. This mode is also known as CTR mode. Note that the SICBlockCipher class does not seem to implement buffering of large key streams. It does also not provide functionality to encryption / decrypt

问题 Is there an implementation of CTR (counter) mode of operation in the Java / C# Bouncy Castle lightweight API? 回答1: Yes, you can use org.bouncycastle.crypto.modes.SICBlockCipher . The documentation of that class reads: Implements the Segmented Integer Counter (SIC) mode on top of a simple block cipher. This mode is also known as CTR mode. Note that the SICBlockCipher class does not seem to implement buffering of large key streams. It does also not provide functionality to encryption / decrypt

问题 I get this exception when I use Dart's encrypt package to decrypt something using AES CTR mode: E/flutter (19095): Invalid argument(s): Input data length must be a multiple of cipher's block size E/flutter (19095): #0 PaddedBlockCipherImpl.process (package:pointycastle/padded_block_cipher/padded_block_cipher_impl.dart:55:9) E/flutter (19095): #1 AES.decrypt (package:encrypt/src/algorithms/aes.dart:38:20) Here is my code: final encrypter = encrypt.Encrypter(encrypt.AES(key, mode: encrypt

问题 I get this exception when I use Dart's encrypt package to decrypt something using AES CTR mode: E/flutter (19095): Invalid argument(s): Input data length must be a multiple of cipher's block size E/flutter (19095): #0 PaddedBlockCipherImpl.process (package:pointycastle/padded_block_cipher/padded_block_cipher_impl.dart:55:9) E/flutter (19095): #1 AES.decrypt (package:encrypt/src/algorithms/aes.dart:38:20) Here is my code: final encrypter = encrypt.Encrypter(encrypt.AES(key, mode: encrypt

问题 I have the following method that creates an Encrypted Private Key using Bouncy Castle for C#: public string GetPrivateKey(AsymmetricCipherKeyPair keyPair, string password) { var generator = new Pkcs8Generator(keyPair.Private, Pkcs8Generator.PbeSha1_3DES); generator.IterationCount = 4; generator.Password = password.ToCharArray(); var pem = generator.Generate(); TextWriter textWriter = new StringWriter(); PemWriter pemWriter = new PemWriter(textWriter); pemWriter.WriteObject(pem); pemWriter

问题 I have the following method that creates an Encrypted Private Key using Bouncy Castle for C#: public string GetPrivateKey(AsymmetricCipherKeyPair keyPair, string password) { var generator = new Pkcs8Generator(keyPair.Private, Pkcs8Generator.PbeSha1_3DES); generator.IterationCount = 4; generator.Password = password.ToCharArray(); var pem = generator.Generate(); TextWriter textWriter = new StringWriter(); PemWriter pemWriter = new PemWriter(textWriter); pemWriter.WriteObject(pem); pemWriter

问题 Note: This (lengthy) question is a follow-up to my previous post. I would like to achieve the encryption of data locally (local RStudio) and decrypt the encrypted data remotely (application hosted on shinyapps.io) . The first part of the code intrinsically encrypts a data-frame using a key . The second part of the code is a shiny application that decrypts the data-frame using the same key and thereby using this data-frame for authentication purposes within the application. The code works just

问题 I have some Key and Initial Vector, which I'm using for encryption purposes in my .NET app. Let's say they are: Key = 0x0102030405060708090A0B0C0D0E IV = 0xA1A2A3A4A5A6A7A8A9AAABACADAE In some cases I would like to perform encryption on the SQL Server (not in the app), but decrypt the data in the app. I thought that I'll might be able to create a temporary symmetric key in the DB and perform encryption: CREATE SYMMETRIC KEY #TempKey WITH ALGORITHM = AES_128 , IDENTITY_VALUE = ??? , KEY_SOURCE

问题 I have some Key and Initial Vector, which I'm using for encryption purposes in my .NET app. Let's say they are: Key = 0x0102030405060708090A0B0C0D0E IV = 0xA1A2A3A4A5A6A7A8A9AAABACADAE In some cases I would like to perform encryption on the SQL Server (not in the app), but decrypt the data in the app. I thought that I'll might be able to create a temporary symmetric key in the DB and perform encryption: CREATE SYMMETRIC KEY #TempKey WITH ALGORITHM = AES_128 , IDENTITY_VALUE = ??? , KEY_SOURCE