How is encryption and decryption done

If you want to decrypt the encrypted file back to readable text, reverse what was done during encryption. Before sending this out, I decided to include a secret code at the beginning of the ciphertext. But how did he manage to hide his identity without me knowing about it? He added a few more letters to the front of the ciphertext. The first letter J became H, and the second N became P, etc… By adding enough additional letters, he could disguise himself completely.

The main difference between encryption and decryption is that encryption requires a shared secret key, whereas decryption uses a single secret key. When someone sends you a piece of information, you can either read it directly or pass it through an algorithm that changes it slightly.

Both processes involve changing the content, but only one needs a shared secret key. Encryption has its advantages as well as its disadvantages. The advantages of encryption technology are that it can be used for digital security, including secure communication and keeping data safe from prying eyes when transmitting information over the internet or even locally on your device.

This encryption key is also used in combination with an encryption algorithm. If someone obtains access to this encryption key, they could decrypt all of your encrypted messages and even use it for their own purposes! This disadvantage can be advantageous, though, as it means that criminals would need both your encryption key and password to decrypt your data if you lose it or forget the encryption keys. To use this against you, criminals would need physical access to both pieces of information to decrypt any encrypted messages created using these encryption methods — increasing encryption security!

As encryption is key-based, only those with the encryption keys can access and read an encrypted message, protecting it from hackers looking to steal information! Cryptographic systems consist of three main components:.

There are many different types of algorithms available such as symmetric ciphers, asymmetric ciphers, and hashing algorithms. Keys — A cryptographic system needs two things to function; firstly, there needs to be some way to generate random numbers to know how to perform operations like addition and multiplication without relying on chance alone.

Modes of Operation — Cryptography modes allow us to combine multiple algorithms to create more complex codes. The most important part of the cryptographic system is the algorithm. Cryptographic algorithms are basically mathematical operations performed over data.

Many kinds of algorithms are available, including symmetric cryptography, asymmetric cryptography, block cipher modes, stream cipher, hashing, MAC, etc. Symmetrical cryptosystems operate under the assumption that all participants share identical secret keys.

Photo by Yelena Odintsova from Pexels. Where do I go? What resources exist? How do I find out about new developments? A Crypto Stack Exchange is exactly what its name implies — a place most likely an online community where all things crypto meet up. Video by Rostislav Uzunov from Pexels. The strongest encryption algorithm is currently considered to be quantum-resistant. This means that even though quantum computers are still years away, it would take millions upon millions of dollars in computing power to crack these types of ciphers.

There are various ways to measure the strength of an encryption algorithm. One way is to compare its security against brute force attacks. A brute-force attack involves trying all possible combinations until the correct combination is found. Another method is comparing the time taken to break down the ciphertext into plain text.

Symmetric crypto algorithms require secret keys to operate correctly. Symmetric crypto algorithms provide confidentiality because they prevent eavesdroppers from reading the contents of transmitted messages. However, symmetric crypto algorithms do not protect against man-in-the-middle attacks.

In this attack, someone intercepts communications between you and your intended recipient. This attacker impersonates the sender, so he appears legitimate while actually capturing everything being communicated. If I say in simple language, encryption is a process used for security of private message or any information sent between two people. In which only you or to whom you are sending your information. No one else can read that because when you encrypt and send any sms or information, they get converted in machine language.

Which makes it impossible to read the original information. But the person who sent it and who sent it have Public Key Encryption. With which they decrypt that message or information again, and read it. Now yzw reading this where you are going to know that it is written bad. And this is a simple conversion while the encryption machine makes it even more complicated than this.

Which makes it impossible to understand. You can understand more well from the image given below. Public key encryption is also a type of encryption.

And nowadays only public key encryption is used in almost all social media emails, messages, chat, whatsapp, then friends, there are two types of keys in this encryption. Private Key — Only you have. Public Key — which all people have. Now if we want to send a private message to a friend that only both of us can read. Few things can kill an application quicker than a security breach. Have I hammered home the point?

In short breach-bad, encryption-good. We all know of many ways to encrypt our data. That leads us to the AWS solution for Encryption. KMS allows for you the brilliant and security-minded engineer to create Asymmetric or Symmetric keys, or if you want AWS to manage the keys they have a solution as well.

Here are the features of KMS:. Pretty cool, right? We utilize KMS to encrypt strings and objects we want secure. Prior to June 16th of , Customer Managed Keys were single-region. Meaning that the keys could only be used for encrypt and decrypt operations in the region in which they were created.

This caused some issues. The first being a DR scenario. What if your main region went down? If you need that decryption and encryption to still happen in your RDS, you might have an issue. This obviously hurts RTO and can cause issues with your application performing operations properly. Well on June 16th of AWS released Multi-Region Keys for the purpose of allowing the keys to be used in; you guessed it: multiple regions.

I wrote a tool in Python that connects to my RDS instance and performs a query. Depending on your schema and how you structure your data, you may need to perform some join operations or query multiple DBs and Tables. How you do that is in your court, it would be impossible for me to cover all the cases of how data is organized. Nevertheless, once you have that part figured out the rest can be quite simple. The first step is creating the new MRK that you need to re-encrypt tuple values to.

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