What is AES in Cybersecurity?
CryptographyAES
Version 1.0 · Published April 2026 · Last verified April 2026
How is it pronounced?
ay-ee-ess
Advanced Encryption Standard is a symmetric block cipher adopted by NIST in 2001 as a replacement for DES. AES encrypts data in 128-bit blocks using key sizes of 128, 192, or 256 bits. It operates in modes like CBC, GCM, and CTR, each with different properties for integrity and parallelization.
Why AES Matters for Your Cybersecurity Career
AES is the default encryption algorithm for most security implementations. Full-disk encryption (BitLocker, FileVault), VPNs, TLS, and database encryption all rely on AES. Security engineers must select correct AES modes (GCM for authenticated encryption vs. CBC). Misusing AES modes has caused real-world vulnerabilities.
Which Cybersecurity Roles Use AES?
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Looking for the acronym? Read about AES in the cybersecurity acronym decoder
Advanced Encryption Standard is a symmetric block cipher adopted by NIST in 2001 as a replacement for DES. AES encrypts data in 128-bit blocks using key sizes of 128, 192, or 256 bits. It operates in modes like CBC, GCM, and CTR, each with different properties for integrity and parallelization.
AES is the default encryption algorithm for most security implementations. Full-disk encryption (BitLocker, FileVault), VPNs, TLS, and database encryption all rely on AES. Security engineers must select correct AES modes (GCM for authenticated encryption vs. CBC). Misusing AES modes has caused real-world vulnerabilities.
Cybersecurity professionals who work with AES include Security Engineer, Security Architect. These roles apply AES knowledge within the Cryptography domain.
Sources
Definitions are original explanations written for career development purposes. For authoritative technical definitions, refer to NIST, ISO, or the relevant standards body.
Last verified: April 2026?Report an inaccuracy
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