We have considered encryption, and in particular, the algo- rithm and underlying

Question

We have considered encryption, and in particular, the algo- rithm and underlying theory of the Advanced Encryption Standard (AES). 3.1. What is the Advanced Encryption Standard 3.2. What is a Certificate Authority 3.3. What is meant by a public key and how is such a key used? 3.4. Consider a very simplified model of AES in which there will be only onePboxandoneSboxandan8bitkey. Use0xAEasthekey. Show, step by step, how one encrypts the string T h e (without any embedded blanks) assuming that each letter is from ISO, thus Ox54, 0x68, 0x65 as the octet (8 bit) hexadecimal values.

Explanation / Answer

3.1. Advance Encryption Standard is symmetric 128 bit block length and 128,192 & 256 bits key length data encryption techniques to encrypt sensitive data which is used by U.S governments to protect important information. AES is included in the ISO/IEC 18033-3 standard

3.2. National Security Agency, USA is the governing authority for AES

3.3 Public keys System is cryptographic encryption system which use two type of kyes i.e first is public keys which are known to everyone and used for encrypt a message and second one is private key which is know to message holder and used to decrypt it.

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