Xem 1-7 trên 7 kết quả Elgamal cryptosystem
  • TRAPDOOR ONE-WAY FUNCTIONThe main idea behind asymmetric-key cryptography is the concept of the trapdoor one-way function. TrapdoorOne-WayFunction(TOWF) One-WayFunction(OWF) 1.fiseasytocompute. 2. f −1 is difficult to compute. 3. Given y and a trapdoor, x can be computed easily.

    pdf10p vovantien_2 05-12-2012 639 608   Download

  • USE OF MODERN BLOCK CIPHERS Symmetric-key encipherment can be done using modern block ciphers. Modes of operation have been devised to encipher text of any size employing either DES or AES. Error Propagation A single bit error in transmission can create errors in several in the corresponding block.

    ppt20p vovantien_2 05-12-2012 549 518   Download

  • USE OF MODERN BLOCK CIPHERS Symmetric-key encipherment can be done using modern block ciphers. Modes of operation have been devised to encipher text of any size employing either DES or AES. 1 USE OF MODERN BLOCK CIPHERS Electronic codebook (ECB) mode Error Propagation A single bit error in transmission can create errors in several in the corresponding block. However, the error does not have any effect on the other blocks.

    pdf10p vovantien_2 05-12-2012 75 43   Download

  • How many padding bits must be added to a message of 100 characters if 8bit ASCII is used for encoding and the block cipher accepts blocks of 64 bits? Suppose that we have a block cipher where n = 64. If there are 10 1’s in the ciphertext, how many trialanderror tests does Eve need to do to recover the plaintext from the intercepted ciphertext in each of the following cases?

    ppt24p vovantien_2 05-12-2012 27 5   Download

  • How many padding bits must be added to a message of 100 characters if 8-bit ASCII is used for encoding and the block cipher accepts blocks of 64 bits? 1 MODERN BLOCK CIPHERS Substitution or Transposition ? To be resistant to exhaustive-search attack, a modern block cipher needs to be designed as a substitution cipher. Suppose that we have a block cipher where n = 64. If there are 10 1’s in the ciphertext, how many trial-and-error tests does Eve need to do to recover the plaintext from the intercepted ciphertext in each of the following cases? a. The cipher is designed as a...

    pdf12p vovantien_2 05-12-2012 29 4   Download

  • Bài báo đề xuất một số thuật toán mật mã khóa công khai được phát triển từ hệ mật ElGamal. Ưu điểm của các thuật toán mới đề xuất là cho phép bảo mật và xác thực thông tin một cách đồng thời. Hơn nữa, mức độ an toàn của các thuật toán mới đề xuất không nhỏ hơn mức độ an toàn của thuật toán ElGamal.

    pdf7p dunglh2013 30-03-2014 21 4   Download

  • Objectives of Chapter 13: To define a digital signature; to define security services provided by a digital signature; to define attacks on digital signatures; to discuss some digital signature schemes, including RSA, ElGamal, Schnorr, DSS, and elliptic curve; to describe some applications of digital signatures.

    pdf8p levuphongqn 18-08-2015 7 3   Download

Đồng bộ tài khoản