Python rsa encryption/decryption (codec, base64 codec), rsabase64

Python rsa encryption/decryption (codec, base64 codec), rsabase64

Recently, there is a need to study the security of RSA encryption and decryption. Baidu has an example article on the Internet, and few articles have introduced how to save, transmit, and print encrypted text information. Directly in a script, the encrypted text information is assigned to the variable, and then the decryption is immediately called. After carefully thinking about the RSA encryption and decryption process, make sure there are two ends, one end is: the encryption end, and the other end is the decryption end, which is generally not on the same machine. Here, I only simulate saving in the file and then read it out. The same is true for how to transmit data over the network.

 

 

1 #/usr/bin/env python 2 #-*-coding: UTF-8-*-3 import rsa 4 import sys 5 import base64 6 7 # print python and windows 8 print ("---- 1 ----") 9 print (sys. version) 10 print (sys. getdefaultencoding () 11 print (sys. getfilesystemencoding () 12 13 # use a pair of keys and save them. pem format file, of course, you can also directly use 14 print ("---- 2 ----") 15 (pubkey, privkey) = rsa. newkeys (1024) 16 pub = pubkey. save_pkcs1 () 17 print (type (pub) 18 pubfile = open ('Public. pem', 'W + ') 19 pubfile. write (pub. decode ('utf-8') 20 pubfile. close () 21 22 print ("---- 3 ----") 23 pri = privkey. save_pkcs1 () 24 print (type (pri) 25 prifile = open ('private. pem', 'W + ') 26 prifile. write (pri. decode ('utf-8') 27 prifile. close () 28 29 # load public key and key 30 print ("---- 4 ----") 31 message = 'dpabdbgdpftrwwgydvdlsadlfsal % 46645645s '32 print ('message:', type (message )) 33 with open ('Public. pem ') as publickfile: 34 p = publickfile. read () 35 print (type (p) 36 pubkey = rsa. publicKey. load_pkcs1 (p. encode ('utf-8') 37 with open ('private. pem ') as privatefile: 38 p = privatefile. read () 39 print (type (p) 40 privkey = rsa. privateKey. load_pkcs1 (p. encode ('utf-8') 41 42 # use the public key to encrypt and then use the private key to decrypt 43 crypto = rsa. encrypt (message. encode ('utf-8'), pubkey) 44 print (crypto) 45 46 print ("---- 5 ----") 47 print ('crypto: ', type (crypto )) 48 print ('Cry _ base64: ', base64.encodestring (crypto) 49 print ('Cry _ base64_utf8:', base64.encodestring (crypto ). decode ('utf-8') 50 # Save to local file 51 cry_file = open('cry_file.txt ', 'W +') 52 cry_file.write (base64.encodestring (crypto ). decode ('utf-8') 53 cry_file.close () 54 55 print ("---- 6 ----") 56 # Read 57 cry_file = open('cry_file.txt ', 'R ') 58 cry_text = ''59 for I in cry_file.readlines (): 60 cry_text + = i61 62 print ('Cry _ text_type: ', type (cry_text )) 63 print ('Cry _ text: ', cry_text) 64 print ('Cry _ base64:', cry_text.encode ('utf-8 ')) 65 crypto_tra = base64.decodestring (cry_text.encode ('utf-8') 66 67 print ("---- 7 ----") 68 assert crypto = crypto_tra69 print (crypto) 70 71 print ("---- 8 ----") 72 plaintext = rsa. decrypt (crypto, privkey) 73 assert message = plaintext. decode ('utf-8') 74 print (plaintext. decode ('utf-8 '))