Symmetric ciphers use symmetric algorithms to encrypt and decrypt data. Symmetric encryption (or pre-shared key encryption) uses a single key to both encrypt and decrypt data. Symmetric key sizes are typically 128 or 256 bits—the larger the key size, the harder the key is to crack. In the final article in this series we will look at the use of encryption modes with symmetric block ciphers, including the need for padding and initialization vectors. These ciphers are used in symmetric key cryptography.A symmetric algorithm uses the same key to encrypt data as it does to decrypt data. Let's take a simple example of a symmetric key encryption algorithm to walk through the overall process of encrypting and decrypting a message. With this type of key cryptography, the sender and receiver of a message share a single key. Use Case of Symmetric Key Cryptography. Symmetric Encryption. Below you can see the code of an application that uses Symmetric-Key Cryptography to encrypt or decrypt a pre-set directory. Additionally, the fact that only one key gets used (versus two for asymmetric cryptography… Here is an example of the AES encryption code (check comments in the code for details): x References and Further Reading. Symmetric cryptography is faster to run (in terms of both encryption and decryption) because the keys used are much shorter than they are in asymmetric cryptography. The keys, in practice, represent a shared secret between two or more parties that can be used to maintain a private information link. In symmetric-key encryption, each computer has a secret key (code) that it can use to encrypt a packet of information before it is sent over the network to another computer. Both the sender and the receiver need the same key to communicate. These types of encryption algorithms are called symmetric because they use the same key to encrypt and decrypt messages. Types of encryption: Symmetric Encryption . Symmetric-key requires that you know which … The former is symmetric encryption, while the latter is called asymmetric encryption. 1. For example, a symmetric algorithm will use key k k k to encrypt some plaintext information like a password into a ciphertext. Symmetric-key algorithms are algorithms for cryptography that use the same cryptographic keys for both encryption of plaintext and decryption of ciphertext.The keys may be identical or there may be a simple transformation to go between the two keys. The most popular Symmetric Algorithms are DES, Triple-DES, AES, Blowfish, RC2, RC4(ARCFOUR), RC5, RC6. Symmetric Encryption. This page walks you through the basics of performing a simple encryption and corresponding decryption operation. 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