转换纯文本以执行Elgamal加密 [英] Convert plaintext to perform elgamal encryption

问题描述

我正在用Java编写程序来测试Elgamal加密的变体，但是我的问题不是encryption/decryption链本身，而是如何对给定的输入执行操作:一个文本文件.我有一个带有一些单词的文本文件(例如，内容可以是:"Hello world, this is a test")，我需要像这样对它们执行数字运算:

Hi i'm writing a program in java to test a variant of the elgamal encryption, however my problem is not the encryption/decryption chain itself, but how to perform the operations on the input given: a text file. I have a text file with some words in it (for example the content can be: "Hello world, this is a test") and i need to perform numeric operations on them like this:

密文=(消息* y)mod p

ciphertext= (message * y) mod p

，其中y和p是两个biginteger.我尝试了此转换链:(一次读取一个字符串):

where y and p are two biginteger. I tried this conversion chain: (reading one string at time):

字符串->十六进制->十进制

String->Hexadecimal->Decimal

然后执行加密操作，然后执行相反的操作:

Then perform the encrypt operation, and then the inverse:

十进制->十六进制->字符串

Decimal->Hexadecimal->String

但这并不是一直都有效(我目前正在对此问题进行调查).已修复.

我的问题是，有更好的方法吗?我正在阅读有关byte array的内容，但不确定如何使用它们.

My question is, there is a better way to do this? I was reading about the byte array's but i'm not sure how to use them.

[如果需要，我可以发布加密/解密链的示例]

[i can post an example of the encryption/decryption chain if needed]

推荐答案

BigInteger具有

BigInteger has a constructor taking a byte array as argument.

使用(例如)UTF-8编码，任何字符串都可以无损地转换为字节数组:

Any String can be converted to a byte array, without loss, using (for example), UTF-8 encoding:

byte[] bytes = string.getBytes(StandardCharsets.UTF_8); 

将两者组合在一起，您就可以轻松地将String转换为BigDecimal.

Combine both, and you have an easy way to transform a String into a BigDecimal.

对于相反的操作，请使用

For the reverse operation, use BigInteger.toByteArray(), and then new String(bytes, StandardCharsets.UTF_8).

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