Mod 3 Sec+ 8e

Adelli sends an image file containing a secret message to her sister as an attachment. Adelli gives her sister instructions over the phone on how to read the message. The sister follows the instructions and reads the message. Which of the following techniques did Adelli use?

• Hashing

• Encryption

• Stenography

• Steganography

Alpha and Beta are having a conversation in English. Gamma, who is a gifted conversationalist and tends to monopolize conversations, approaches Alpha and Beta. As soon as Alpha and Beta see Gamma, they start speaking in Spanish, but Gamma does not understand. What did Alpha and Beta just do?

• They employed a form of tokenization.

• They employed a form of encryption.

• They employed a form of substitution.

• They employed a form of steganography.

A fifth-grade teacher shows the class a message encrypted using ROT13. After explaining how it works, the teacher challenges them to decrypt the message, which they easily accomplish. The teacher then repeats the process with the XOR cipher. Which of the following statements is true? Select two.

• ROT13 uses transposition.

• XOR uses a form of metadata.

• Both methods use substitution.

• XOR requires some type of key.

• The class easily decrypts XOR messages.

Johnny develops an app to encrypt short messages. He runs the encryption program, but it is designed to deliberately introduce a 5- to 15-second delay before encryption begins. What type of data is Johnny about to encrypt?

• Plaintext

• Cleartext

• Ciphertext

• Pretext

Which of the following statements best describes the critical factor that allows cryptographic algorithms to be effective?

• The details of how the algorithm works must be guarded.

• The encryption algorithm and keys must both be guarded.

• The algorithms must be able to guarantee confidentiality.

• The key(s) used by algorithms must be securely guarded.

Which of the following statements best describes the benefits of cryptography? Select two.

Hiding information through encryption so that threat actors cannot view it is considered one of several different mitigation techniques that enterprises can use to protect information. It is also considered a hardening technique that makes a system more resilient to attacks. Which of the following statements are true about encryption?

• It is a hashing technique.

• It is a hardening technique.

• Cipher algorithms are secret.

• It can hide the existence of data.

Daichi works on a project team that is designing a storage system with immutable archiving capabilities. Once data is archived, it uses cryptography to verify the data has not been changed. Which security protection is the system designed to enforce?

• Immutability of data

• Nonrepudiation

• Integrity

• Data masking

An employee tries to mask his identity by programmatically changing the From field to "a-nony-mouse" in an email. He uses periodic intervals to send the email to the entire company promoting a product he is selling online. An investigation reveals who sent the message. What capability of cryptography was used to confirm the sender's identity?

• Metadata

• Obfuscation

• Repudiation

• Nonrepudiation

A group of scientists are trying to vigorously protect a major discovery that will potentially lead to a series of breakthrough products. They all sign a special nondisclosure agreement and commit to not revealing the information to others outside of the department. What approach have the scientists agreed to employ?

• Diffie-Hellman

• Secure obfuscation

• Signed message digest

• Security through obscurity