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Home›Category: "Cryptography" (Page 2)

Cryptography

  • Discuss the four types of transformations used by AES?

    Cryptography
    November 23, 2020
    by remshad
    In AES, all operations are performed on 8-bit bytes. In particular, the arithmetic operations of addition, multiplication, and division are performed over the finite field GF(28 ). Section 5.6 discusses ...
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  • List out and explain the components of block ciphers in symmetric key encryption?

    Cryptography
    November 23, 2020
    by remshad
    Block Cipher A block cipher is one in which a block of plaintext is treated as a whole and used to produce a ciphertext block.   Typically, a block size of ...
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  • List out criteria of a cryptographic hash function ?

    Cryptography
    November 23, 2020
    by remshad
    A hash function H accepts a variable-length block of data M as input and produces a fixed-size hash value as output h = H(M) Principal objective of hash function  is ...
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  • Discuss any three modes of operation in block ciphers?

    Cryptography
    November 23, 2020
    by remshad
      Block ciphers convert b-bit plaintext block into b-bit ciphertext block. If the amount of plaintext to be encrypted is greater than b bits, then the plaintext is broken up ...
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  • Compare and contrast DES and AES?

    Cryptography
    November 22, 2020
    by remshad
    DES (Data Encryption Standard) and AES (Advanced Encryption Standard) both are the symmetric block cipher. AES was introduced to overcome the drawback of DES. As DES has a smaller key ...
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  • With the help of a block diagram explain the RSA algorithm for digital signature ?

    Cryptography
    November 22, 2020
    by remshad
    Digital signatures are like electronic “fingerprints.” In the form of a coded message, the digital signature securely associates a signer with a document in a recorded transaction Where public & ...
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  • With the help of block diagram explain DES?

    Cryptography
    November 22, 2020
    by remshad
    Issued in 1977 by the National Bureau of Standards (now NIST) as Federal Information Processing Standard (FIPS) 46 Was the most widely used encryption scheme until the introduction of the ...
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  • Explain an Diffie-hellman key exchange algorithm?

    Cryptography
    November 22, 2020
    by remshad
    Purpose is to enable two users to securely exchange a key that can then be used for subsequent symmetric encryption of messages The algorithm is limited to the exchange of ...
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  • What is the RSA algorithm?

    Cryptography
    November 22, 2020
    by remshad
    The RSA algorithm is an asymmetric cryptography algorithm; this means that it uses a public key and a private key (i.e two different, mathematically linked keys). As their names suggest, a public key is shared publicly, ...
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  • Describe the main applications of Public key cryptography?

    Cryptography
    November 22, 2020
    by remshad
    Public-key cryptography, or asymmetric cryptography, is an encryption scheme that uses two mathematically related, but not identical, keys - a public key and a private key. Unlike symmetric key algorithms ...
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