aes算法:观察明文2位变化对密文的影响_AES加密的工作模式ECB、CBC、CFB、OFB及案例...

# ECB模式
def ecb_enc():
    return x1^key, x2^key, x3^key
 
# CBC模式
def cbc_enc():
    return (iv^x1)^key, (((iv^x1)^key)^x2)^key, (((((iv^x1)^key)^x2)^key)^x3)^key
 
# OFB模式
def ofb_enc():
    return x1^(iv^key), x2^((iv^key)^key), x3^(((iv^key)^key)^key)
 
# CFB模式
def cfb_enc():
    return x1^(iv^key), x2^(x1^(iv^key)^key), x3^(x2^(x1^(iv^key)^key)^key)
# 输入学号后两位数字 n，出生年份后两位数字 m (00后取99年)。
print('请输入学号后两位数字 n:')
n = int(input())
print('请输入出生年份后两位数字 m:')
m = int(input())
 
x1, x2, x3 =  n % 64, (n + 20) % 64, (n + 40) % 64
iv = m % 64
k = '100110'
 
key = int(k,2)
print('x1={}, x2={}, x3={}'.format(x1,x2,x3))
# 转为二进制后
print('转为二进制后: x1={}, x2={}, x3={}'.format(bin(x1),bin(x2),bin(x3)))
 
# ECB模式下
ecb_y1, ecb_y2, ecb_y3 = ecb_enc()
print('ECB模式下: y1={}, y2={}, y3={}, 二进制: y1={}, y2={}, y3={}'.format(ecb_y1, ecb_y2, ecb_y3, bin(ecb_y1), bin(ecb_y2), bin(ecb_y3)))
 
# CBC模式下
cbc_y1, cbc_y2, cbc_y3 = cbc_enc()
print('CBC模式下: y1={}, y2={}, y3={}, 二进制: y1={}, y2={}, y3={}'.format(cbc_y1, cbc_y2, cbc_y3, bin(cbc_y1), bin(cbc_y2), bin(cbc_y3)))
 
# OFB模式下
ofb_y1, ofb_y2, ofb_y3 = ofb_enc()
print('OFB模式下: y1={}, y2={}, y3={}, 二进制: y1={}, y2={}, y3={}'.format(ofb_y1, ofb_y2, ofb_y3, bin(ofb_y1), bin(ofb_y2), bin(ofb_y3)))
 
# CFB模式下
cfb_y1, cfb_y2, cfb_y3 = cfb_enc()
print('CFB模式下: y1={}, y2={}, y3={}, 二进制: y1={}, y2={}, y3={}'.format(cfb_y1, cfb_y2, cfb_y3, bin(cfb_y1), bin(cfb_y2), bin(cfb_y3)))