What is decoding? Encoding vs decryption explained

Cryptography is used to protect data from unauthorized access. Decoding is an essential part of it: without decryption, encryption would lose half its purpose. If you are interested in What is decoding then read on for the details on how decryption works MONA Media shared.

What is Decode?

Once data has been encrypted, its content cannot be read without decoding. Decoding converts encrypted data back to its original form, or to a form that a person or computer can read. The process is also called decryption, and it works by reversing the encryption operations to recover the original data. Much information needs to be encrypted during operation so that it cannot be read in transit. The final recipient, the person allowed to read that data, knows how to decode it and receive the content.

The difference between encryption and decryption

Encryption turns original data into an unrecognizable format, usually with a main algorithm. Data is encrypted to keep information safe and protect companies' trade secrets. Both encryption and decryption need an algorithm together with a key to work with each other.

Below is a comparison of encryption and decryption to help you see how the two terms differ.

Types of decryption in use today

There are four basic types of decryption: classical, one-way, symmetric and asymmetric.

Classical decryption

Classical decryption is the oldest kind of decoding in the history of cryptography. It works on the alphabet and is usually done by hand or with simple mechanical devices. The two basic classical methods are transposition and substitution. It only applies to classically encrypted data and is not hard for the person decoding it.

Classical ciphers can be broken by trying every possible case (working out probabilities and testing each in turn), or by using letter frequency, then tallying the statistics and choosing the most plausible decoding. Today, though, classical decryption is obsolete, because modern hacker can handle that data very easily.

One-way decryption

One-way decryption is a method for checking information without translating it back to the original text. The best-known example is the hash function, which turns an ordinary string of characters into a string of fixed length in order to verify data integrity. The most widely used algorithms are SHA and MD5.

Symmetric decryption

Symmetric decryption comes in two types: stream ciphers and block ciphers. A stream cipher processes the message one bit at a time, while a block cipher groups several bits into a unit and processes them together. In practice, symmetric decoding means the data is shared between two or more parties holding the same key.

Asymmetric decryption

Asymmetric decryption needs two keys to unlock secret information: a public key and a private key. They act as a master key that can handle any data to be decoded. The encryption and decryption process works like this: the sender uses the public key to encrypt the data and sends the file to the recipient, and the recipient uses the private key to read it.

The drawback of this method is that it is fairly slow compared with symmetric decryption, and the CPU needs more processing power. Longer decryption time also means higher cost. How long decoding takes depends on the algorithm, the key and the way the data was encrypted.

Uses of decoding

Encryption keeps data from leaking out, and decryption lets the intended recipient read it. Without decoding, cryptography would lose half its value: the information would be protected, but the recipient could not use it. Decoding is used in nearly every area of life, especially information technology and electronic engineering.

Why are decryption and encryption always used together?

Encryption and decryption always have to be used together for cryptography to work at its best. It is like locking a door: you need a key to open it, otherwise the door stays shut for good. Encrypting and decrypting let you protect data effectively and hand it only to people who are allowed to receive it.

Every type of encryption has its own decryption method, and whoever decodes must use that exact method to get an accurate result. Usually, the person who encrypts tells the person who decrypts the key to use. If you do not know the method in advance, you can still try different methods, but this takes a lot of time, especially with long or hard-to-crack encrypted data.

Devices used for decryption today

You can use dedicated devices to decrypt faster and more accurately. Most of them handle both encryption and decryption. Here are some tools that support decoding.

• Secret Service for Mac: A dedicated decryption tool for Mac.
• Encryption and Decryption: Encrypts and decrypts data effectively, keeping documents, messages, emails and more fully protected.
• Encrypt Easy: A powerful decryption tool for people who are not specialists in the field.
• Crypt for Mac: Provides data encryption and decryption, suitable for companies and businesses.

This article has covered what you need to know about decryption. We hope it answered your question about What is decoding and helped you see why both encryption and decryption need to exist.

See also: What is encoding? An overview of how encoding works