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Characteristics and application of RSA algorithm

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加密算法分为对称算法和非对称算法两种，RSA属于应用最为广泛的非对称加密算法。其基本安全原理是建立在大素数因子很难分解的基础上，属于分组密码体制。简单的说：知道两个质数，求出它们的乘积，很容易；但知道一个整数，分解成两个质数就很复杂了。 RSA是非对称加密算法，加密与解密的密钥不同，有别于DES这类对称算法。RSA主要缺点是产生密钥受到素数产生技术的限制；密钥分组长度较长，运算速度较低。 RSA算法也分为两种模式，NDE模式和CRT模式 1、通常使用公钥的运算，速度是比较快的。因为E我们一般选取的都比较小，无论是0x010001还是0x03 2、通常私钥的运算是比较慢的，因为私钥中的D比较大，长度和模长相同，比如1024bit。为了提高私钥运算的速度，才有了CRT模式，所以在加密芯片里，我们都采用CRT模式来做私钥的运算。即便如此，私钥的运算速度还是比公钥的计算要慢一些。 凌科芯安科技LKT4201N等加密芯片支持RSA1024、RSA2048和国际上通用的对称和非对称算法，开发的技术人员不要错过。

Characteristics and application of RSA algorithm

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