IT Security: Defense Against The Digital Dark Arts
IT Security: Defense against the digital dark arts
Exam (elaborations)
IT Security: Defense against the digital dark arts. Week2: Pelcgbybtl (Cryptology) Already Passed
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IT Security: Defense against the digital dark arts
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IT Security: Defense Against The Digital Dark Arts
IT Security: Defense against the digital dark arts. Week2: Pelcgbybtl (Cryptology) Already Passed What are the components that make up a cryptosystem? Check all that apply encryption algorithms decryption algorithms key generation algorithms; A cryptosystem is a collection of algorithms needed to o...
IT Security: Defense against the digital dark arts. Week2: Pelcgbybtl (Cryptology) Already Passed What are the components that make up a cryptosystem? Check all that apply ✔✔encryption algorithms decryption algorithms key generation algorithms; A cryptosystem is a collection of algorithms needed to o perate an encryption service. This involves generating encryption keys, as well as encryption and decryption operations. What is steganography? ✔✔the practice of hiding messages; Steganography involves hiding messages, but not encoding them. What makes an encryption algorithm symmetric? ✔✔the same keys used for encryption and decryption; The symmetry of a symmetric algorithm refers to one key being used for both encryption and decryption. What's the difference between a stream cipher and a bl ock cipher? ✔✔Stream ciphers encrypt data as a continuous stream, while block ciphers operate on chunks of data; A stream cipher takes data in as a continuous stream, and outputs the ciphertext as a continuous stream, too. A block cipher encrypts the data in chunks, or blocks. True or false: The smaller the encryption key is, the more secure the encrypted data is. ✔✔false; The reverse is true. The larger the key, the more secure the encrypted data will be. Which of the following do asymmetric cryptosystem s provide? Check all that apply. ✔✔confidentiality authenticity non-repudiation; Confidentiality is provided by the encryption and decryption functionality, while authenticity and non -repudiation are ensured by the signing and verification processes. Wha t advantages do asymmetric algorithms have over symmetric ones? ✔✔they allow secure communication over insecure channels; By exchanging public keys for encrypting data, asymmetric encryption securely exchanges information over untrusted channels. What's a common application for asymmetric algorithms? ✔✔Secure key exchange; Asymmetric encryption schemes are perfect for securely exchanging small amounts of data over untrusted networks by exchanging public keys that are used for encrypting data. How is hashi ng different from encryption? ✔✔hash operations are one -directional; Hash functions, by definition, are one -way, meaning that it's not possible to take a hash and recover the input that generated the hash. Encryption, on the other hand, is two -directional, since data can be both encrypted and decrypted. What's a hash collision? ✔✔When two different files generate the same hash digest; If two different files result in the same hash, this is referred to as a hash collision. Hash collisions aren't awesome, as this would allow an attacker to create a fake file that would pass hash verification. How is a Message Integrity Check (MIC) different from a Message Authentication Code (MAC)? ✔✔a MIC only hashes the message, while a MAC incorporates a secret key; A MIC can be thought of as just a checksum or hash digest of a message, while a MAC uses a shared secret to generate the checksum. This also makes it authenticated, since the other party must also have the same shared secret, preventing a third party from forgi ng the checksum data. How can you defend against brute -force password attacks? Check all that apply. ✔✔run passwords through the hashing function multiple times incorporate salts into password hashing
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