Fundamentals of Cryptography

What is cryptography?

• A method for creating digital art.

• A way to speed up internet connections.

• A type of computer virus.

• Cryptography is the practice of securing information through techniques like encryption.

What are the two main types of cryptography?

• Block cipher and stream cipher

• Hash functions and digital signatures

• Symmetric key cryptography and asymmetric key cryptography

• Public key cryptography and private key cryptography

What is a symmetric key in cryptography?

• A symmetric key is a single key used for both encryption and decryption in cryptography.

• A symmetric key is used only for encryption.

• A symmetric key is a unique key for each user.

• A symmetric key is a public key used for secure communication.

What is an asymmetric key in cryptography?

• An asymmetric key is a key pair used in cryptography, consisting of a public key for encryption and a private key for decryption.

• A key that is only used for signing messages.

• A single key used for both encryption and decryption.

• A key that changes every time it is used.

What does the term 'encryption' mean?

• The process of converting data into a coded format to prevent unauthorized access.

• The method of compressing data to save space.

• The act of sharing data openly without restrictions.

• A technique for backing up data securely.

What is the purpose of a hash function?

• To compress data for storage efficiency.

• The purpose of a hash function is to map data of arbitrary size to fixed-size values for data integrity and efficient retrieval.

• To convert data into a human-readable format.

• To encrypt data for secure transmission.

What is a digital signature?

• A digital signature is a type of physical signature.

• A digital signature is a form of email encryption.

• A digital signature is a method for creating digital art.

• A digital signature is a cryptographic method used to validate the authenticity and integrity of a digital message or document.

What is the role of a certificate authority?

• The role of a certificate authority is to issue and manage digital certificates that authenticate the identity of entities and enable secure communications.

• To provide internet service to users

• To create software applications for businesses

• To store user passwords securely

What is the difference between encryption and encoding?

• Encoding is used to secure data for privacy.

• Encryption and encoding are the same process.

• Encryption is a method of data compression.

• Encryption secures data for confidentiality, while encoding formats data for compatibility.

What is a common algorithm used for symmetric encryption?

• Triple Data Encryption Standard (3DES)

• Data Encryption Standard (DES)

• Rivest Cipher (RC4)

• Advanced Encryption Standard (AES)