1. the initial encryption standard developed by NIST was called data encryption standard (DES). DES is too weak

for modern applications since the key size is only 56-bit. It was replaced by advanced encryption standard (AES). AES has variable key sizes and can require a key size of 256-bit. Discuss if you think AES key size has a direct relationship with algorithm strength

2. what are the advantages and disadvantages of using Asymmetric encryption? 

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