Let's take a simple example of a symmetric key encryption algorithm to walk through the overall process of encrypting and decrypting a message. References and Further Reading. 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. In symmetric encryption, there is only one key, and all parties involved use the same key to encrypt and decrypt information. In order to perform encryption/decryption you need to know: With this type of key cryptography, the sender and receiver of a message share a single key. Symmetric Encryption. 1. 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. 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. Symmetric encryption (or pre-shared key encryption) uses a single key to both encrypt and decrypt data. The libcrypto library within OpenSSL provides functions for performing symmetric encryption and decryption operations across a wide range of algorithms and modes. The AES encryption is a symmetric cipher that uses the same key for encryption and decryption. 3DES is Officially Being Retired (2018), by Jasmine Henry; Trends in Cryptography Part 1 – Algorithms and Encryption (2018), by Rob Stubbs The former is symmetric encryption, while the latter is called asymmetric encryption. Symmetric key sizes are typically 128 or 256 bits—the larger the key size, the harder the key is to crack. First up, we have symmetric cryptography. These ciphers are used in symmetric key cryptography.A symmetric algorithm uses the same key to encrypt data as it does to decrypt data. The most popular Symmetric Algorithms are DES, Triple-DES, AES, Blowfish, RC2, RC4(ARCFOUR), RC5, RC6. Both the sender and the receiver need the same key to communicate. Here is an example of the AES encryption code (check comments in the code for details): x Symmetric ciphers use symmetric algorithms to encrypt and decrypt data. The keys, in practice, represent a shared secret between two or more parties that can be used to maintain a private information link. Types of encryption: Symmetric Encryption . This page walks you through the basics of performing a simple encryption and corresponding decryption operation. These types of encryption algorithms are called symmetric because they use the same key to encrypt and decrypt messages. 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