Proposed RC4 algorithm generates two bytes per clock cycle. Encryption is performed by using two keys and two blocks of plain texts. Similarly, decryption is performed by using the two keys and two blocks of cipher texts.SAIPRIYA SAMALA
RC4 is no longer considered secure and careful consideration should be taken regarding it’s use. The symmetric key algorithm is used identically for encryption and decryption such that the data stream is simply XORed with the generated key sequence. The algorithm is serial as it requires success...
Despite its complexity, RC4 is remarkably fast. In fact, it's one of the fastest tools on the market. For people who don’t want to spend long minutes on both encryption and decryption, that speed is ideal. Pros and cons of RC4 ...
""" RC4 encryption/decryption """ key=[ord(c)forcinkey] S=KSA(key) keystream=PRGA(S) result=[] forcharinplaintext: val=("%02x"%(ord(char) ^next(keystream)))# XOR and format as hex result.append(val) return''.join(result) # 示例 key='woodpecker' plaintext='woodpecker{this_is...
"""RC4 encryption with random salt and final encoding""" salt = '' for n in range(salt_length): salt += chr(random.randrange(256)) data = salt + crypt(data, sha1(key + salt).digest()) if encode: data = encode(data) return data ...
"""RC4 encryption with random salt and final encoding""" salt = '' for n in range(salt_length): salt += chr(random.randrange(256)) data = salt + crypt(data, sha1(key + salt).digest()) if encode: data = encode(data) return data ...
A rising input on the START port triggers the beginning of a cryptographic operation, using the either the KEY or Sin inputs to initialize the keystream. In any case the old state is evacuated via the Sout pins. The core then starts to output the keystream per RC4 algorithm. ...
介绍 在密码学中,RC4(Rivest Cipher 4,也称为ARC4或ARCFOUR,意为所谓的RC4)是一种流密码。尽管它以简单性和软件速度着称,但在RC4中发现了多个漏洞,使其不安全。当不丢弃输出密钥流的开头或使用非随机或相关密钥时,它特别容易受到攻击。RC4的使用特别有问题,导致协
把明文变换成密文的过程就是加密(Encryption),其反过程(把密文还原为明文)就是解密(Decryption)。一般的密码系统的模型如图2-1:图2-1 一般的密码系统模型密钥(Key)是进行数据加密或解密时所使用的一种专门信息,可看成是密码中的参数,用K表示。加密时使用的密钥叫加密密钥,解密时使用的密钥叫解密密钥。密码系统是...
* The Key Stream for decryption * * If CRYPT_RC4_MODE == CRYPT_RC4_MODE_MCRYPT, this will be equal to the mcrypt object * *@seeCrypt_RC4::setKey() *@varArray *@accessprivate */var$decryptStream=false;/** * The $i and $j indexes for encryption ...