Modern Block Cipher

2 articles in this category.

A visual representation of AES CTR, CFB, OFB, and XTS modes of operation

Modern Block Cipher Intermediate

AES Modes of Operation: CTR, CFB, OFB, and XTS

AES only encrypts one 16-byte block. A mode of operation is the wrapper that turns that single block into something that protects a whole message or an entire disk. This guide walks through four modes, CTR, CFB, OFB, and XTS, with verified NIST numbers you can check yourself.

Nov 9, 2026 14 min read

A visual representation of the AES Algorithm

Modern Block Cipher Intermediate

AES

AES secures nearly everything: HTTPS traffic, encrypted disks, and government secrets alike. Here's how the Rijndael cipher transforms data, round by round.

Aug 4, 2026 17 min read

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