Question 1

What is AES encryption?

Accepted Answer

AES (Advanced Encryption Standard) is a symmetric block cipher that has become the global standard for encryption. It encrypts data in 128-bit blocks using keys of 128, 192, or 256 bits.

Question 2

Which AES mode should I use?

Accepted Answer

CBC mode is commonly recommended for most applications. ECB mode should be avoided for encrypting data larger than one block as it reveals patterns. CTR mode is good for streaming data.

Question 3

What key sizes does AES support?

Accepted Answer

AES supports three key sizes: AES-128 (16 bytes), AES-192 (24 bytes), and AES-256 (32 bytes). Longer keys provide stronger security.

Question 4

What is IV in AES encryption?

Accepted Answer

IV (Initialization Vector) is a random value used with modes like CBC, CFB, OFB, and CTR to ensure that identical plaintexts produce different ciphertexts. IV should be unique but doesn't need to be secret.

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