对称加密算法和非对称加密算法速度对比

测试环境：
CPU 1 核 Intel 2.2GHZ
内存 1GB

加密明文长度为160 bytes
各运行10000次

上代码 test_aes.py

from Crypto.Cipher import AES
import time
obj = AES.new(‘This is a key123‘, AES.MODE_CBC, ‘This is an IV456‘)
message = ‘a‘ * 160
t1 = time.time()
for i in xrange(10000):
    ciphertext = obj.encrypt(message)
    obj2 = AES.new(‘This is a key123‘, AES.MODE_CBC, ‘This is an IV456‘)
    text = obj2.decrypt(ciphertext)
    #print text
t2 = time.time()
print t2 - t1

test_rsa.py

from Crypto.PublicKey import RSA
import time
t1 = time.time()
key = RSA.generate(2048)
t2 = time.time()
print ‘gen key‘, t2 - t1
#print key
#print key.exportKey()
#print RSA.exportKey(‘PEM‘)
message = ‘a‘ * 160
t1 = time.time()
for i in xrange(10000):
    print i
    ciphertext = key.encrypt(message, None)
    key.decrypt(ciphertext)
t2 = time.time()
print t2 - t1

对称加密算法比非对称加密算法快大约1500倍
RSA 生成一个密钥都需要0.68秒, 可见对称加密算法比非对称加密算法有非常大得性能优势。