1. The AES encryption is a symmetric cipher that uses the same key for encryption and decryption. Symmetric key sizes are typically 128 or 256 bits—the larger the key size, the harder the key is to crack. For example, a symmetric algorithm will use key k k k to encrypt some plaintext information like a password into a ciphertext. 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. Just like two Spartan generals sending messages to each other, computers using symmetric-key encryption to send information between each other must have the same key. Symmetric Encryption. Use Case of Symmetric Key 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. In order to perform encryption/decryption you need to know: These types of encryption algorithms are called symmetric because they use the same key to encrypt and decrypt messages. First up, we have symmetric cryptography. Symmetric ciphers use symmetric algorithms to encrypt and decrypt data. In symmetric encryption, there is only one key, and all parties involved use the same key to encrypt and decrypt information. 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. References and Further Reading. Symmetric Encryption. 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. Below you can see the code of an application that uses Symmetric-Key Cryptography to encrypt or decrypt a pre-set directory. 3DES is Officially Being Retired (2018), by Jasmine Henry; Trends in Cryptography Part 1 – Algorithms and Encryption (2018), by Rob Stubbs Symmetric-key requires that you know which … Additionally, the fact that only one key gets used (versus two for asymmetric cryptography… 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. Here is an example of the AES encryption code (check comments in the code for details): x The former is symmetric encryption, while the latter is called asymmetric encryption. Types of encryption: Symmetric Encryption . The keys, in practice, represent a shared secret between two or more parties that can be used to maintain a private information link. 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