python使用公钥(N,e)实现对密文解密
时间: 2024-02-01 14:02:37 浏览: 141
首先,需要使用RSA算法生成一对公私钥,其中公钥包含两个部分:模数N和公钥指数e。假设已经生成好了公私钥对,现在要使用公钥(N,e)来解密密文。
步骤如下:
1. 将密文转换成数字。可以使用base64等编码方式将字符串转换成数字。
2. 对密文进行解密。使用公钥(N,e)对密文进行解密,得到明文的数字。
3. 将明文数字转换成字符串。使用相应的编码方式将数字转换成字符串。
下面是Python代码示例:
```python
import base64
from Crypto.PublicKey import RSA
# 加载公钥
with open('public_key.pem', 'r') as f:
public_key = RSA.import_key(f.read())
# 密文
ciphertext = 'R1NQSXNzdWVyZTEyMzQ1Ng=='
# 将密文转换成数字
ciphertext = base64.b64decode(ciphertext)
ciphertext = int.from_bytes(ciphertext, 'big')
# 使用公钥解密密文
plaintext = pow(ciphertext, public_key.e, public_key.n)
# 将明文数字转换成字符串
plaintext = plaintext.to_bytes((plaintext.bit_length() + 7) // 8, 'big').decode()
print(plaintext)
```
其中,`public_key.pem`是公钥文件的路径,`ciphertext`是密文。最后输出的`plaintext`即为解密后的明文。
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