--- title: "#block-cipher articles | Hashnode" description: "Explore 3 articles tagged #block-cipher on Hashnode. Tutorials, guides, and how-tos from the community." url: "https://hashnode.com/tag/block-cipher" --- Tag # #block-cipher 3 posts · 0 followers [박서경](https://hashnode.com/@eumgil) · [Mar 17, 2025](https://hashnode.com/posts/block-cipher-modes-of-operation/67d880e814e0c05d324b1d8a) ### [Block cipher - Modes of Operation](https://psk-study.hashnode.dev/block-cipher-modes-of-operation?utm_source=hashnode&utm_medium=feed) What is Mode? A mode of operation in cryptography refers to the method used to apply a block cipher algorithm (such as AES or DES) to encrypt or decrypt larger amounts of data. Since block ciphers operate on fixed-size blocks (e.g., 128-bit blocks in... 4 min read · [psk-study.hashnode.dev](https://psk-study.hashnode.dev/block-cipher-modes-of-operation?utm_source=hashnode&utm_medium=feed) [박서경](https://hashnode.com/@eumgil) · [Mar 17, 2025](https://hashnode.com/posts/symmetric-key-algorithm-1-des/67d8018eb432fbcc25234c57) ### [Symmetric key algorithm - (1) DES](https://psk-study.hashnode.dev/symmetric-key-algorithm-1-des?utm_source=hashnode&utm_medium=feed) (1)Characteristics of DES Block Cipher: Encrypts data in fixed-size 64-bit blocks. Key Length: Uses a 56-bit key, making it vulnerable to brute-force attacks. Feistel Structure: Based on a Feistel network with 16 rounds of encryption . Subkeys Ge... 6 min read · [psk-study.hashnode.dev](https://psk-study.hashnode.dev/symmetric-key-algorithm-1-des?utm_source=hashnode&utm_medium=feed) [박서경](https://hashnode.com/@eumgil) · [Mar 17, 2025](https://hashnode.com/posts/symmetric-key-algorithm-2-aes/67d80793b4d064fabafc8b99) ### [Symmetric key algorithm - (2) AES](https://psk-study.hashnode.dev/symmetric-key-algorithm-2-aes?utm_source=hashnode&utm_medium=feed) AES is a symmetric key encryption algorithm that has replaced DES due to its higher security and efficiency. 1. Block Cipher Structure AES encrypts fixed-size 128-bit blocks of data. Unlike DES (which uses a Feistel structure), AES uses a substitut... 3 min read · [psk-study.hashnode.dev](https://psk-study.hashnode.dev/symmetric-key-algorithm-2-aes?utm_source=hashnode&utm_medium=feed)