Advantages and Disadvantages of DES

 Advantages:

• its a fifty six bit key. therefore there area unit 2^56 prospects of keys which might take a decade to search out the proper key exploitation brute-force attack
• Encryption and cryptography takes identical formula. solely that the operate ought to be reversed and also the key ought to be taken in opposite order. this is often terribly convenient for computer code and hardware necessities.

Disadvantages:(I would say little weaknesses!)

• Weak keys : the key that's elect on the rounds area unit a tangle . throughout cacophonous  of keys to 2 0.5 and swapping them may give identical result if they need continuous 1’s and 0’s. Thins lands up in exploitation identical key through out the 16-cycles
• There is same output from the S-Boxes on totally different inputs on permutation. These area unit known as Semi weak keys.
• If the message is encrypted with a selected key, and is taken 1’s compliment of that secret writing are going to be same as that of the secret writing of the compliment message and compliment key.

Advantages

1. For secret writing, DES uses the 56-bit key. Besides, there area unit 256 doable keys, which implies a brute force attack can ne'er have any impact.

2. cryptographer is liberal to perform cryptanalytics, therefore on exploit the Des formula. However, have found it extraordinarily exhausting to search out any major weakness.

Disadvantages

1. consultants have found a weakness within the style of the cipher.

2. S box creates same output with 2 chosen input.

3. The initial and final permutation isn't specifically clear and appears confusing.

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