Question

WHAT the output block size in bytes for a Data Encryption Standard algorithm?

Answer 1

Answer:

Data Encryption Standard

Data Encription Standard Flow Diagram.svg

The Feistel function (F function) of DES

General

Designers

IBM

First published

1975 (Federal Register) (standardized in January 1977)

Derived from

Lucifer

Successors

Triple DES, G-DES, DES-X, LOKI89, ICE

Cipher detail

Key sizes

56 bits (+8 parity bits)

Block sizes

64 bits

Structure

Balanced Feistel network

Rounds

16

Best public cryptanalysis

DES has been considered insecure right from the start because of the feasilibity of brute-force attacks[1] Such attacks have been demonstrated in practice (see EFF DES cracker) and are now available on the market as a service. As of 2008, the best analytical attack is linear cryptanalysis, which requires 243 known plaintexts and has a time complexity of 239–43 (Junod, 2001).

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Answer 2

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