diff --git a/AES_CBC.py b/AES_CBC.py
new file mode 100644
index 0000000..496f618
--- /dev/null
+++ b/AES_CBC.py
@@ -0,0 +1,62 @@
+from binascii import b2a_hex, a2b_hex
+from Crypto.Cipher import AES
+from Crypto import Random
+import time  # 引入time模块
+iv = Random.new().read(AES.block_size)
+
+
+
+class aestest():
+    # ***********Begin**************
+    def __init__(self, key):
+        self.key = key.encode('utf-8')
+
+    def encrypt(self, text):
+        text = text.encode('utf-8')
+        aes = AES.new(self.key,AES.MODE_CBC,iv)  # 这里是直接调用函数AES.new，参数是密钥和ECB模式设置。初始化加密器
+
+        ctext = aes.encrypt(text)  # 加密
+
+        return ctext
+
+    def decrypt(self, text):
+        text = text.encode('utf-8')
+        aes = AES.new(self.key, AES.MODE_CBC,iv)
+        plain = aes.decrypt(a2b_hex(text))
+        return plain
+
+
+# ************End***************
+
+def Evidence(text, key):
+
+    aes = aestest(key)
+    text = text.encode('utf-8')
+    T1 = time.time()
+    for i in range(100000):
+        enc = aes.encrypt(text)
+    T2 = time.time()
+    # print(T2-T1)
+    T_e = T2-T1
+    enc = b2a_hex(enc)  # 字符串转换
+    T3 = time.time()
+    for i in range(100000):
+        detext = aes.decrypt(enc)
+    T4 = time.time()
+    # print(T4-T3)
+    T_d = T4-T3
+    return T_e,T_d
+
+
+#
+# if __name__ == "__main__":
+#     # str1, str2 = input().split()
+#     # Evidence(str1, str2)
+#     test = {24:'123456781234567812345678'}
+#     for b,str2 in test.items():
+#         T_e = Evidence('xyqshiyigedasgya', str2)[0]
+#         T_d = Evidence('xyqshiyigedasgya', str2)[1]
+#         print(str(b)+'位的加密时间是'+str(T_e)+"      它加密的数据是"+str2)
+#         print('它的加密效率是'+str(12.8/T_e)+' Mbps')
+#         print(str(b) + '位的解密时间是' + str(T_d))
+#         print('它的解密效率是' + str(12.8 / T_d) + ' Mbps')
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