Why the middle portion of 3des is a decryption instead of encryption?
Answers
Why is the middle portion of 3DES a decryption rather than an encryption? There is no cryptographic significance to the use of decryption for the second stage. Its only advantage is that it allows users of 3DES to decrypt data encrypted by users of the older single DES by repeating the key.
Answer:
Reason
Explanation:
DES-The Data Encryption Standard (DES) is a symmetric-key block cipher. DES is an implementation of a Feistel Cipher. It uses 16 round Feistel structure. The block size is 64-bit.
Properties-
• Different keys are used for encryption and decryption.
• Each receiver possesses a unique decryption key, generally referred to as his private key.
• Receiver needs to publish an encryption key, referred to as his public key.
• Encryption algorithm is complex enough to prohibit attacker from deducing the plaintext from the ciphertext and the encryption (public) key.
ECC-Elliptic Curve Cryptography (ECC) is a term used to describe a suite of cryptographic tools and protocols whose security is based on special versions of the discrete logarithm problem. ECC is based on sets of numbers that are associated with mathematical objects called elliptic curves.
Blowfish is an encryption algorithm that can be used as a replacement for the DES or IDEA algorithms. It is a symmetric block cipher that uses a variable-length key, from 32 bits to 448 bits, making it useful for both domestic and exportable use.
RC5 algorithm-
The RC5 encryption algorithm is a fast, symmetric block cipher suitable for hardware or software implementations. A novel feature of RC5 is the heavy use of data-dependent rotations. RC5 has a variable-length secret key, providing flexibility in its security level.
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https://brainly.in/question/39633057?referrer=searchResults
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