Encryption algorithms in python

It requires two things, data and key and when XOR operation is applied on both the operands i. It is nothing but a simple process in which we convert our data or information into secrete code to prevent it from unauthorized access and keep it private and secure. First, we will select an image, and then we will convert that image into a byte array due to which the image data will be totally converted into numeric form, and then we can easily apply the XOR operation on it. Now, whenever we will apply the XOR function on each value of the byte array then the data will be changed due to which we will be unable to access it.

But we should remember one thing that here our encryption key plays a very important role without that key we can not decrypt our image. It acts as a password to decrypt it. Here in above program, as we can see that how XOR operation works, it takes two variables data and key, whenever we perform XOR operation on them for the first time we get encrypted data.

Then when we perform XOR operation between our data and key again, we get same value as our input variable data decrypted data. Same logic will be applicable on byte array of Image during encryption and decryption.

How to encrypt and decrypt image using python

Now we convert that binary form of data into a byte array, then we apply the XOR operation on each value of byte array which changes the data due to which we will be unable to open the image.

It is nothing but a process of converting our encrypted data into a readable form. Here we will again apply the same XOR operation on an encrypted image to decrypt it. But always remember that our encryption key and decryption key must be the same.

Here in the above Decryption program we use same procedure that we use during Encryption of image. Below is the video which depicts the functionality of the above programs using a given image and a key. Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics. Writing code in comment? Please use ide. Related Articles.

Last Updated : 12 Nov, Encryption It is nothing but a simple process in which we convert our data or information into secrete code to prevent it from unauthorized access and keep it private and secure.

Below program depicts the basic approach of encryption: Python3.Classification of encryption algorithms. Symmetric encryption adopts symmetric cipher coding technology, which is characterized by using the same key for file encryption and decryption. The sender and receiver need to hold the same key, which is used by both sending and receiving messages. Compared with asymmetric encryption, symmetric encryption has higher encryption and decryption speed, but both parties need to know the key in advance, and the key may be stolen in the transmission process, so the security is not as high as asymmetric encryption.

The receiver needs to generate the public key and private key before sending the message, and then send the public key to the sender.

After receiving the public key, the sender encrypts the data to be sent with the public key and sends it to the receiver. After receiving the received data, decrypt it with the private key. In this process, the public key is responsible for encryption, and the private key is responsible for decryption. The encryption and decryption speed of asymmetric encryption algorithm is lower than that of symmetric encryption algorithm, but its security is higher.

Before the data is sent, the message digest algorithm is used to generate the signature of the data, and then the signature and the data are sent to the receiver together. After receiving the data, the receiver uses the message digest algorithm to obtain the signature, and finally compares whether the signature is consistent, so as to judge whether the data is modified in the transmission process.

encryption algorithms in python

Symmetric key encryption, also known as private key encryption. That is, the sender and receiver use a key to encrypt and uncover the data. The biggest advantage is that the encryption and decryption speed is fast, which is suitable for encrypting a large amount of data.

The disadvantage of symmetric encryption is the management and distribution of the key, in other words, how to send the key to the people who need to decrypt your message. In the process of sending the key, there is a great risk that the key will be intercepted by hackers.

In reality, the method is to encrypt the symmetric key asymmetrically and then pass it to the person who needs it. Asymmetric encryption system, also known as public key encryption.

Asymmetric encryption provides a very secure way for data encryption and decryption. She uses a pair of keys, a private key and a public key. The private key can only be safely kept by one party and cannot be disclosed. The public key can be sent to anyone who requests her. Asymmetric encryption uses one of these keys for encryption, while decryption requires another key. For example, if you go to the bank, you ask for the public key from the bank, and the bank sends you the public key.

If you encrypt the message with the public key, only the holder of the private key, the bank, can decrypt your message. Unlike symmetric encryption, the bank does not need to send the private key over the network. Therefore, the security is greatly improved. At present, the most commonly used asymmetric encryption algorithm is RSA algorithm. Public key mechanism is flexible, but encryption and decryption speed is much slower than symmetric key encryption.

Public key mechanism is flexible, but encryption and decryption speed is much slower than heap encryption. Her browser first generates a random number as a symmetric key. The receiver uses the private key to decrypt to get the symmetric encryption key, and then both parties can use symmetric encryption to communicate.

The encryption methods we mentioned are all encryption of binary encoding format, which corresponds to our bytes in Python.

encryption algorithms in python

Therefore, when we encrypt operations in Python, we should ensure that we operate on bytes, otherwise we will report an error. Base64 coding can be called the cornerstone of cryptography. Any binary data can be Base64 encoded. All data can be encoded into a text file that can be represented in only 65 characters.With statement Aanybody can read and understand it clearly.

However, a cryptanalyst may be able to decrypt the concept of statement B. In the examples above, statement A is plaintext, while statement B is a reverse cipher text. Thus, cryptography is defined as the art of manipulating or scrambling plaintext into ciphertext. Cryptography originated approximately years ago in Egypt. The Egyptians used to communicate through messages written in hieroglyph.

The code was known only by the scribes referred to as writers and recipients. A cryptanalyst is someone who hacks or breaks or decrypts a ciphered text.

Simple Python Encryption: How to Encrypt a Message

The Caesar shift cipher is one of the earliest methods in cryptography. In this method, the message is hidden from unauthorized readers by shifting the letters of a message by an agreed number.

Upon receiving the message, the recipient would then shift the letters back by the same number agreed upon earlier. A cryptanalyst may be able to decrypt the message by observing the cipher method.

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In reverse cipher method, letters are not shifted. Rather, the message is encrypted in a reverse order. To decrypt a message in reverse, we just reverse the reversed message to the original form.

Julius Caesar invented the reverse cipher circa years ago. Apart from the reverse and Caesar shift cipher, others such as substitution shift cipher were also used in the early days of cryptography.

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However, most of these methods can be decrypted easily. The primary objective of cryptography is to provide the following basic security concepts in information security. Although cryptography helps us to detect whether a data has been altered, it cannot prevent data alteration. Remember the reverse cipher is encrypted in a reverse form.

Any addition of a letter in the message may compromise integrity.

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It looks like this:. The inclusion of those three letters altered the data and made its syntax quite weird.

encryption algorithms in python

Integrity simply helps in detecting data alteration. Authentication helps in identifying the sender of the message or where the message originated. In addition, it also provides assurance about the date and time of transmission of data. Confidentiality is the fundamental security concept provided by cryptography. For instance, in the Caesar shift method, the sender can use an agreed number to keep the meaning of a message from unauthorized users. The recipient can decrypt the message via the agreed number.

In this tutorial, we are going encrypt a message in Python via reverse cipher. Typically, the cryptography library and others such as PyCryptoM2Cryptoand PyOpenSSL in Python is the main reason why the majority prefers to use Python for encryption and other related cryptographic activities.Cryptography is the art of communication between two users via coded messages.

The science of cryptography emerged with the basic motive of providing security to the confidential messages transferred from one party to another. Cryptography is defined as the art and science of concealing the message to introduce privacy and secrecy as recognized in information security.

An Intro to Encryption in Python 3

The plain text message is the text which is readable and can be understood by all users. The plain text is the message which undergoes cryptography. The process of converting plain text to cipher text is called encryption. It is also called as encoding. The process of converting cipher text to plain text is called decryption.

It is also termed as decoding. The cipher text is generated from the original readable message using hash algorithms and symmetric keys.

Later symmetric keys are encrypted with the help of asymmetric keys. The best illustration for this pattern is combining the hash digest of the cipher text into a capsule. The receiver will compute the digest first and later decrypt the text in order to verify that text is not tampered in between.

Second layer of encryption is the process of adding one more layer to cipher text with same or different algorithm. Usually, a bit character long symmetric password is used for the same.

Hybrid cryptography is the process of using multiple ciphers of different types together by including benefits of each of the cipher. There is one common approach which is usually followed to generate a random secret key for a symmetric cipher and then encrypt this key via asymmetric key cryptography. Due to this pattern, the original message itself is encrypted using the symmetric cipher and then using secret key.

Python is an open source scripting language which is high-level, interpreted, interactive and object-oriented. It is designed to be highly readable.

The syntax of Python language is easy to understand and uses English keywords frequently. Python is processed at runtime using the interpreter.Instead, you get hashing libraries. We will learn how to encrypt and decrypt strings with both of these libraries.

Python also supports the adler32 and crc32 hash functions, but those are in the zlib module. One of the most popular uses of hashes is storing the hash of a password instead of the password itself.

encryption algorithms in python

Of course, the hash has to be a good one or it can be decrypted. Another popular use case for hashes is to hash a file and then send the file and its hash separately. Then the person receiving the file can run a hash on the file to see if it matches the hash that was sent.

If it does, then that means no one has changed the file in transit. First off, we import hashlib and then we create an instance of an md5 HASH object. Next, we add some text to the hash object and we get a traceback. It turns out that to use the md5 hash, you have to pass it a byte string instead of a regular string. If you prefer the hex digest, we can do that too:. As you can see, we can create our hash instance and call its digest method at the same time.

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Then we print out the hash to see what it is. I chose to use the sha1 hash as it has a nice short hash that will fit the page better. Python has pretty limited support for key derivation built into the standard library. It uses HMAC as its psuedorandom function. You might use something like this for hashing your password as it supports a salt and iterations.

For example, if you were to use SHA you would need a salt of at least 16 bytes and a minimum ofiterations. Basically it protects your password from dictionary attacks and pre-computed rainbow tables. Here we create a SHA hash on a password using a lousy salt but withiterations.Join Stack Overflow to learn, share knowledge, and build your career.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Hey, I have been working on this for a while, and I can remebr my brother stepped me through this very same alogorithm. But I can't seem to remember what we did as far as decrypting. Its difficult to revers a mod :P Any ideas? That's simple, let's see how it works. First of all, the encrypted message is obtained by subtracting the key.

I'm not an expert in math, for further reading, you should check out Number theory. Here is the refined code:. Learn more. Custom Python Encryption algorithm Ask Question.

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Asked 9 years, 11 months ago. Active 7 months ago. Viewed 16k times. Basicly, it just adds the ascii values of both the characters from the key, and the phrase. Improve this question. Jacob Valenta Jacob Valenta 5, 5 5 gold badges 27 27 silver badges 42 42 bronze badges. Active Oldest Votes. Improve this answer. CCG 65 8 8 bronze badges.

Cryptography with Python - Quick Guide

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