Conversation

Notices

Embed this notice
翠星石 (suiseiseki@freesoftwareextremist.com)'s status on Monday, 11-Sep-2023 19:22:59 JST 翠星石
in reply to
- Vftdan
@vftdan In AES Electronic Code Book (ECB) mode, yes: https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation?useskin=monobook#Electronic_codebook_(ECB)

If you use AES Cipher Block Chaining (CBC) mode, you're generally good, as the IV + XORing of the previous blocks + the avalanche effect ensures that even encrypting all 0 has random-looking ciphertext.
In conversation about a year ago from freesoftwareextremist.com permalink
Attachments
1. Domain not in remote thumbnail source whitelist: login.wikimedia.org
  
  Block cipher mode of operation
  
  In cryptography, a block cipher mode of operation is an algorithm that uses a block cipher to provide information security such as confidentiality or authenticity. A block cipher by itself is only suitable for the secure cryptographic transformation (encryption or decryption) of one fixed-length group of bits called a block. A mode of operation describes how to repeatedly apply a cipher's single-block operation to securely transform amounts of data larger than a block.Most modes require a unique binary sequence, often called an initialization vector (IV), for each encryption operation. The IV has to be non-repeating and, for some modes, random as well. The initialization vector is used to ensure distinct ciphertexts are produced even when the same plaintext is encrypted multiple times independently with the same key. Block ciphers may be capable of operating on more than one block size, but during transformation the block size is always fixed. Block cipher modes operate on whole blocks and require that the last part of the data be padded to a full block if it is smaller than the current block size. There are, however, modes that do not require padding because they effectively...
- Embed this notice
  Vftdan (vftdan@mastodon.ml)'s status on Monday, 11-Sep-2023 19:23:00 JST Vftdan
  
  Do I understand correctly, that with AES and other block ciphers if the plaintext has repeating 16-byte-aligned-and-long regions, they will correspond to repeating ciphertext regions?
  #cryptography
  
  In conversation about a year ago permalink

Public

Conversation

Notices

Feeds