Comparison of SHA and MD5

1.Security against brute force attack :

• SHA operations are $2^{160}$

• MD5 operations are $2^{128}$

• It is difficult to have same message digest for two different messages

• Brute force attack is harder for SHA (160 vs 128 bits for MD5)

2. Security against crypt analysis:

• MD5 is undertake, SHA is not vulnerable.

3. Speed:

• MD5 executes faster when compared to SHA due to less but needed, 64 steps vs 80 steps

• Both depend on addition module of $2^{32}$ and could seen well on 32 bit processors.

4. Simplicity and compactness :

• Both are simple to describe and implement.

• MD5 uses little endian, SHA uses big endian.