RSA encryption/decryption, signature/authentication under Python

The original is the PY2 environment, and my environment is py3, so the original code has been modified: decode (), encode ()

ImportRSA#Generate key(PubKey, Privkey) = Rsa.newkeys (1024)#Save KeyWith open ('Public.pem','w+') as F:f.write (PUBKEY.SAVE_PKCS1 (). Decode ()) with open ('Private.pem','w+') as F:f.write (PRIVKEY.SAVE_PKCS1 (). Decode ())#Import KeyWith open ('Public.pem','R') as F:pubkey=RSA. PUBLICKEY.LOAD_PKCS1 (F.read (). Encode ()) with open ('Private.pem','R') as F:privkey=RSA. PRIVATEKEY.LOAD_PKCS1 (F.read (). Encode ())#plaintextMessage ='Hello'#Public Key CryptographyCrypto =Rsa.encrypt (Message.encode (), PubKey)#private Key DecryptionMessage =Rsa.decrypt (crypto, Privkey). Decode ()Print(message)#private key SignatureSignature = Rsa.sign (Message.encode (), Privkey,'SHA-1')#Public Key ValidationRsa.verify (Message.encode (), signature, PubKey)

Application Scenarios

ImportRSA#Generate key(PubKey, Privkey) = Rsa.newkeys (1024)# =================================#Scenario 0: Key Save import# =================================#Save KeyWith open ('Public.pem','w+') as F:f.write (PUBKEY.SAVE_PKCS1 (). Decode ()) with open ('Private.pem','w+') as F:f.write (PRIVKEY.SAVE_PKCS1 (). Decode ())#Import KeyWith open ('Public.pem','R') as F:pubkey=RSA. PUBLICKEY.LOAD_PKCS1 (F.read (). Encode ()) with open ('Private.pem','R') as F:privkey=RSA. PRIVATEKEY.LOAD_PKCS1 (F.read (). Encode ())# =================================#Scenario One: Data disclosure issues#in order to open up the market, the company manager assigned a group of sales agents around the world to investigate business opportunities. #The salesmen were all very capable, and soon they found a good business opportunity. #Time is Money! They must report to the manager immediately by email. #This is the trouble: The network is not safe! #all kinds of data are caught, email password leaked ... It's horrible! The various means of business rivals are horrible! #How to let the salesman's email safely to the company manager's hands? (even if the data is caught, the mailbox password is compromised ...)#It's not safe, so what? #  #That's right! Smart you must have thought: encryption. # =================================#Clear text: Business opportunity found by salesmanMessage ='here is the opportunity: ...'#The clerk uses the public key of the company manager to encrypt the plaintext in advance, and get ciphertextCrypto_email_text =Rsa.encrypt (Message.encode (), PubKey)#then, the clerk sends the cipher by email#..... #e-mail in the network transmission ... (All kinds of data are caught, email password leaked)#There is no way, or be a conscientious to see this email:Print(Crypto_email_text)#What the hell? Do not understand Ah! #Finally, the company manager also received the salesman sent an email. Open, and only see a bunch of strange characters! #no problem, the company manager uses his private key to decrypt the ciphertext received, it can get clear textMessage =Rsa.decrypt (Crypto_email_text, Privkey). Decode ()#then, you can see the important opportunity information.Print(message)# =================================#Scenario Two: Identity verification issues#in order to open up the market, the company manager assigned a group of salesmen to explore business opportunities. #In this process, the company manager often through email to the salesman issued important instructions#However, the network is not safe! For example: Packet is modified, mailbox password leaked ...#Commercial competitors can forge/modify the important instructions of the company manager through various means! # #that morning, the salesman opened the mailbox as usual, found the company manager of an email: ordered him to return home immediately. #No, it's not. Yesterday said to expand business here, how today is changed? #is this email sent by the manager of the company? #What to do? # #That's right! Smart You must also think of: signature. # =================================#Clear Text: instructions from the company managerMessage ='This is an important instruction: ...'#Company manager private key SignatureCrypto_email_text = Rsa.sign (Message.encode (), Privkey,'SHA-1')#clerk at the same time received instructions plaintext, ciphertext, and then use the public key authentication, to identifyRsa.verify (Message.encode (), Crypto_email_text, PubKey)

Disclaimer: Original Blog link address: http://www.cnblogs.com/hhh5460/p/5243410.html

RSA encryption/decryption, signature/authentication under Python