Security systems on computer networks (cyber security) are a top priority in this era of digital development. Lots of unscrupulous hackers of important information or data appear, and harm many parties. Therefore, cyber need tools that are able to maintain the confidentiality of data, such as cryptography. This time, we will thoroughly explore what Cryptography is in a summary that you can see below.
What is Croptography?
What is Cryptography? Cryptography is two words combined in Greek, namely Kryptos and Graphein. When translated, Kryptos means hidden or secret, while graphein means writing. Literally, Cryptography is the process of writing or conveying messages in a hidden way to maintain confidentiality.
If it is associated with the use of digital technology, Cryptography is the study of encryption techniques to disguise and secure information. Cryptography is derived from mathematical concepts and algorithms, to preserve information through the use of codes.
In cryptography, this code is considered as writing that serves to hide important data. Algorithms and mathematical calculations are used to make messages difficult to read by users who do not have access.
Types of Cryptographic Methods Cryptography
is classified into three different types of methods, namely:
- Symmetric Key Cryptography
Symmetric key cryptography is also called secret key cryptography, where the recipient and sender of information only use one key to encrypt data. This approach is considered more efficient than other methods. This type of cryptography is often used AES (Advanced Encryption System).
- Public Key Cryptography
Public key cryptography is the most revolutionary concept of data protection in the last 300, to 400 years. This cryptography is considered more secure when compared to symmetric keys.
This method utilizes two interconnected keys, namely the public key and the private key. If the public key is paired with the private key, the encryption code and the data in the key remain secret.
- Hash Function
Hash function is used to summarize the data and send the summarized explanation. This cryptography uses mathematical equations, where the algorithm will take a numeric value as input which will then be summarized by the hash system. This method does not require a key, because the function has been adapted for one-way data transmission scenarios (direct).
Techniques The technique used in cryptography is the scrambling, which is a method to convert plain text into ciphertext. This technique is better known as encryption and decryption.
Encryption is the process of securing information data, by changing the original text (plaintext), into text that is difficult to read (ciphertext). While decryption aims to understand the message so that it can be read by the user.
Due to the priority of techniques used to protect privacy data, the term cryptography was changed to modern cryptography. The following are some of the goals that are the basis of cryptography, including:
Authentication is a process where the recipient and the sender know the identity of each data source used.
The information feature is protected, where unauthorized parties will not be able to access the information.
Power that will be received and sent cannot be changed without the knowledge of both parties concerned.
Recipients and senders cannot deny the purpose of changing or creating information.