One-time Passwords (OTP) is a password that is valid for only one login session or transaction in a computer or a digital device. Now a days OTP’s are used in almost every service like Internet Banking, online transactions, etc. They are generally combination of 4 or 6 numeric digits or a 6-digit alphanumeric.
random() function can be used to generate random OTP which is predefined in random library. Let’s see how to generate OTP using Python.
Used Function:
random.random(): This function returns any random number between 0 to 1.
math.floor(): It returns floor of any floating number to a integer value.
Using the above function pick random index of string array which contains all the possible candidates of a particular digit of the OTP.
Example #1 : Generate 4 digit Numeric OTP
Python3
# import libraryimport math, random# function to generate OTPdef generateOTP() : # Declare a digits variable # which stores all digits digits = "0123456789" OTP = "" # length of password can be changed # by changing value in range for i in range(4) : OTP += digits[math.floor(random.random() * 10)] return OTP# Driver codeif __name__ == "__main__" : print("OTP of 4 digits:", generateOTP()) |
Output:
OTP of 4 digits: 3211
Example #2: Generate alphanumeric OTP of length 6
Python3
# import libraryimport math, random# function to generate OTPdef generateOTP() : # Declare a string variable # which stores all string string = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' OTP = "" length = len(string) for i in range(6) : OTP += string[math.floor(random.random() * length)] return OTP# Driver codeif __name__ == "__main__" : print("OTP of length 6:", generateOTP()) |
Output:
OTP of length 6: pyelJl
Example #3: Using String constants
Python3
# Importing random to generate# random string sequenceimport random # Importing string library functionimport string def rand_pass(size): # Takes random choices from # ascii_letters and digits generate_pass = ''.join([random.choice( string.ascii_uppercase + string.ascii_lowercase + string.digits) for n in range(size)]) return generate_pass # Driver Code password = rand_pass(10)print(password) |
Output:
2R8gaoDKqn
