COMP1806: Information Security Lecture 9 – Applications of Cryptography

<p>To prevent others from knowing the entire key scheme (B)</p> Signup and view all the answers

<p>To ensure security and complexity of the encryption (B)</p> Signup and view all the answers

<p>To propose the radically different approach of public and private keys (B)</p> Signup and view all the answers

<p>Symmetric key encryption (C)</p> Signup and view all the answers

<p>Sharing the key openly with all parties (C)</p> Signup and view all the answers

<p>Failure to keep the secret key known only to sender / receiver (D)</p> Signup and view all the answers

<p>1.8x10^56 years (B)</p> Signup and view all the answers

<p>Fixing the limitations of symmetric key encryption using asymmetric key encryption (B)</p> Signup and view all the answers

<p>Inability to ensure the secret key is ONLY known to sender and receiver (A)</p> Signup and view all the answers

<p>Ensuring data confidentiality, data integrity, and data authenticity (D)</p> Signup and view all the answers

<p>The message received is the same as the message sent (C)</p> Signup and view all the answers

<p>Using digital certificates (B)</p> Signup and view all the answers

<p>The sender encrypts the message using a cryptographic key (A)</p> Signup and view all the answers

<p>Using hashing to create a unique message digest (B)</p> Signup and view all the answers

<p>A user or system using digital certificates (D)</p> Signup and view all the answers

<p>Efficient encryption and decryption (C)</p> Signup and view all the answers

<p>To make it difficult to estimate the effort required to break the cipher (A)</p> Signup and view all the answers

<p>Ciphertext is typically shorter than plaintext (B)</p> Signup and view all the answers

<p>To perform a one-one mapping from plaintext to ciphertext (B)</p> Signup and view all the answers

<p>They should have efficient algorithms (A)</p> Signup and view all the answers

<p>Secure communication over insecure channels (A)</p> Signup and view all the answers

<p>To make it difficult to estimate the effort required to break the cipher (C)</p> Signup and view all the answers

<p>Ciphertext is typically shorter than plaintext (B)</p> Signup and view all the answers

<p>To ensure that breaking the cipher is economically feasible (C)</p> Signup and view all the answers

<p>They should have efficient algorithms (C)</p> Signup and view all the answers

A type of encryption where the same key is used to encrypt and decrypt data.

Ensures the data remains confidential and is not accessible by unauthorized parties.

A significant challenge in symmetric encryption due to the need to securely distribute keys to authorized parties.

Refers to the ability to guarantee the origin and integrity of data, ensuring it hasn't been altered.

Using a cipher to protect the message by scrambling it and making it unintelligible to those without the appropriate key.

The process of transforming encrypted data back to its original form.

The original form of data before it's been encrypted.

The scrambled data after encryption.

Involved in ensuring that the message has not been tampered with during transmission.

Used to verify the identity of the sender or receiver of a message, ensuring authenticity and preventing forgery.

A method of encryption that uses separate keys for encryption and decryption. One key is public, and the other is private.

The key associated with asymmetric encryption that is publicly available.

The key associated with asymmetric encryption that is kept secret and only known to the owner.

A key exchange protocol used in asymmetric encryption to ensure secure communication between parties.

A widely used algorithm for asymmetric encryption that relies on the difficulty of factoring large numbers.

Large prime numbers are essential in RSA Algorithm as they make it extremely difficult to find their factors.

In RSA algorithm, the private key is used to decrypt the message encrypted with the corresponding public key.

A method for confirming one's identity to another party without revealing any sensitive information.

The aim is to provide confidentiality and ensure the encryption process is computationally secure.

In a symmetric encryption scheme, the ciphertext length can be either equal to or larger than the plaintext length.

The encryption function transforms plaintext into ciphertext using the key.

Both encryption and decryption functions must be reversible and computationally efficient.

Symmetric encryption primarily addresses the challenge of securely transmitting data, ensuring only authorized parties can access it.

The primary goal of an efficient symmetric encryption scheme is to achieve quick encryption and decryption processes.

In symmetric encryption, the challenge of managing and distributing keys securely to authorized parties is a common point of failure.

Unlike asymmetric encryption, symmetric encryption only provides confidentiality and does not ensure message authenticity.