COMPUTER ETHICS AND SECURITY
CRYPTOGRAPHY AND ENCRYPTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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True
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False
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Either A or B
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None of the above
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Detailed explanation-1: -A hash algorithm is designed to create a hash that represents the contents of a set of data that can later be decrypted. A block cipher works on a single character at a time, and is faster than a stream cipher.
Detailed explanation-2: -A hashing algorithm is a mathematical function that garbles data and makes it unreadable. Hashing algorithms are one-way programs, so the text can’t be unscrambled and decoded by anyone else.
Detailed explanation-3: -Design of Hashing Algorithms At the heart of a hashing is a mathematical function that operates on two fixed-size blocks of data to create a hash code. This hash function forms the part of the hashing algorithm. Hashing algorithm involves rounds of above hash function like a block cipher.
Detailed explanation-4: -Digital Signatures Once a cryptographic hash is created for a message, the hash is encrypted with the sender’s private key. This encrypted hash is called a digital signature.
Detailed explanation-5: -The MD5 hashing algorithm (RFC 1321) was designed in 1992 by Ron Rivest as an improved version of MD4. It is an unkeyed hash with an output of 128 bits. The message to be hashed is processed by MD5 in 512-bit blocks. The message is first padded so that its length is a multiple of 512 bits.