CS5010RR datasheet(2/8 Pages) ETC2

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CS5010-40 DES/3DES Encryption/Decryption Cores

APPLICATIONS

♦ Electronic financial transactions

eCommerce

-Banking

Securities exchange

Point-of-Sale

♦ Secure corporate communications

Storage Area Networks (SAN)

Virtual Private Networks (VPN)

Video conferencing

Voice services

♦ Personal mobile communications

Video phones

-PDA

Point-to-Point Wireless

Wearable computers

♦ Secure environments

Satellite communications

Surveillance systems

Network appliances

DATA ENCRYPTION ALGORITHM

The Data Encryption Algorithm is an iterated block cipher

with a Feistel structure that encrypts and decrypts data in 64-

bit data blocks using a 56-bit key. The algorithm consists of:

•

An initial permutation of the input data

•

Sixteen rounds of the same process - the DES round

•

A final inverse initial permutation of the data

Figure 2 represents a block diagram of the Data Encryption

Algorithm. A DES round transforms the data using

permutations, additions and non-linear substitutions. The

DES key schedule consists of three parts:

Key Permutation - to remove the eight redundant parity

bits within the 64-bit key, and to permute the key

Scheduled Circular Shifting - the permuted key is circu-

larly shifted according to a schedule by either 1 or 2 bits,

to the left or right.

Key Compression - the 56-bit shift key is compressed

using another permutation, or rearrangement, to obtain a

48-bit subkey.

The Triple Data Encryption Algorithm offers increased

security by extending the DES key to 112 or 168 bits, thus

greatly reducing the effectiveness of exhaustive key searches

or "brute-force" attacks. Triple DES is simply three successive

DES operations in the sequence of encrypt-decrypt-encrypt, or

decrypt-encrypt-decrypt if decrypting data.

Figure 2: DES Algorithm Structure

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