Cryptography

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Author:
anthonyrt2015
ID:
304896
Filename:
Cryptography
Updated:
2015-07-07 13:59:22
Tags:
SEC
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Description:
Crypto
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  1. _______encryption uses the same key to encrypt and decrypt.
    Symmetric
  2. ________encryption solves the key distribution problem.
    Asymmetric
  3. Which type of encryption is slower than the other?
    Asymmetric is 100 times slower than Symmetric
  4. _______ encrypt one character of data at a time.
    Stream Ciphers
  5. What are the two types of Ciphers?
    Block and Stream
  6. AES
    what is the block size and key size
    • Advanced Encryption Standard¬†
    • block size 128 key size 128, 192, and 256
  7. ____ is the concept that a sender cannot deny sending a message.
    Non-repudiation
  8. ____ provides integrity to a message being sent.
    Hashing
  9. _____ and ____ are the most common hashing algorithms.
    MD5 and SHA-1
  10. ____ Provides Authenticity to Hashed messages.
    HMAC-Hashed based Message Authentication Code
  11. Explain the following:
    MD5
    SHA-1
    SHA-2
    HMAC-MD5
    HMAC-SHA1
    • MD5-creates 128-bit hashes
    • SHA-1-creates 160-bit hashes
    • SHA-2 creates 224-,256-,384-, or 512-bit hashes
    • HMAC-MD5- creates 128-bit hashes while authenticating
    • HMAC-SHA1- creates 160-bit hashes while authenticating
  12. ____ is a symmetric block cipher that was widely used for many years, dating back to 1970's.  It encrypts data in 64-bit blocks.
    DES (Data Encryption Standard)
  13. _____is a strong symmetric block cipher that encrypts data in 128-bit blocks.
    AES (Advanced Encryption Standard)
  14. What are some uncommonly used Hashing Algorithms
    RIPEMD, LANMAN, NTLM
  15. Cryptography provides 4 essential services which are ______?
    • Confidentiality
    • Integrity
    • Authentication
    • Non-repudiation
  16. _____ is considered the fastest of the symmetric algorithms.
    Blowfish
  17. IDEA
    • International Data Encryption Algorithm
    • 64-bit block cipher
    • 128-bit key length

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