AES
The Advanced Encryption Standard (AES) is a symmetric block cipher that encrypts and decrypts data in 128-bit blocks using 128-, 192-, or 256-bit keys.
Grokking Relational Database Design
AES is a symmetric block-cipher standard that encrypts data using key sizes of 128, 192, or 256 bits.
- How it is used
- Protects reusable sensitive database values while allowing applications to decrypt them for later transactions.
- How deep it goes
- Explains shared-key encryption, variants, block size, initialization vectors, and binary encoding, but stops short of implementation code.
- Examples
- Uses saved card_number and expiry_date values in a payment_method table as the concrete encryption example.
- What you can do after
- Apply AES-256 to replace plain-text storage for sensitive, reusable database values.
Hacking Cryptography
A symmetric block-cipher standard adopted for protecting data in applications ranging from financial transactions to classified information.
- How it is used
- Frames AES as a practical standard for protecting sensitive data while directing attention toward implementation security.
- How deep it goes
- Defines AES’s structure, key sizes, and security status, then stops short of detailing its round transformations or algorithms.
- Examples
- Uses bank transactions, classified data, and padding bugs that expose AES-encrypted plaintext as concrete examples.
- What you can do after
- Diagnose AES deployments by separating attacks on the cipher’s theory from failures in padding and other implementation details.
Related concepts
- block cipherkind of · A block cipher is a keyed symmetric cryptographic algorithm that transforms fixed-size blocks of data into ciphertext.
- cryptographic keyuses · A cryptographic key is a value supplied to a cryptographic algorithm to control operations such as encryption, decryption, signing, authentication, or verification.
- symmetric key encryptionkind of · Symmetric-key encryption is cryptography that uses the same shared secret key, or equivalent derived key material, to encrypt and decrypt data.
- encryptionkind of · Encryption is the cryptographic transformation of readable data into ciphertext to conceal its contents, reversible through decryption with appropriate information.
- CCMPused by · CCMP is an IEEE 802.11 wireless security protocol that combines AES counter-mode encryption with CBC-MAC-based message authentication.
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