python RC4

RC4是一种流加密算法，由Ron Rivest在1987年设计。它的主要特点是简单快速，而且在加密解密过程中使用的密钥长度可变。RC4算法被广泛应用于网络安全领域，如SSL、TLS、WEP、WPA等协议中。在Python中，可以使用下面的代码实现RC4算法：

def KSA(key):
    """ Key-Scheduling Algorithm (KSA) """
    S = list(range(256))
    j = 0
    for i in range(256):
        j = (j + S[i + key[i % len(key)]) % 256
        S[i], S[j = S[j], S[i]
    return S

def PRGA(S):
    """ Pseudo-Random Generation Algorithm (PRGA) """
    i, j = 0, 0
    while True:
        i = (i + 1) % 256
        j = (j + S[i]) % 256
        S[i], S[j = S[j], S[i]
        K = S[(S[i + S[j]) % 256]
        yield K

def RC4(key, text):
    """ RC4 encryption/decryption """
    S = KSA(key)
    keystream = PRGA(S)
    res = []
    for char in text:
        res.append(char ^ next(keystream))
    return bytes(res)

以上代码实现了RC4算法的Key-Scheduling Algorithm (KSA)和Pseudo-Random Generation Algorithm (PRGA)两个步骤，以及RC4的加密/解密过程。RC4算法可以用来加密和解密二进制数据，通过使用不同的密钥和明文，可以得到不同的密文。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* *2* [RC4加密算法及Python实现](https://blog.csdn.net/wangjiaweiwei/article/details/129711536)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 50%"]
- *3* [RC4原理及其Python的实现](https://blog.csdn.net/qq_40279192/article/details/107430848)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 50%"]
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