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Betty receives a cipher text message from her colleague Tim. What type of function does Betty need to use to read the plaintext message? |
Decryption |
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Alice and Bob would like to communicate with each other using a session key but they do not already have a shared secret key. Which algorithm can they use to exchange a secret key? |
Diffie-Hellman |
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Gary is sending a message to Patricia. He wants to ensure that nobody tampers with the message while it is in transit. What goal of cryptography is Gary attempting to achieve? |
Integrity |
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When Patricia receives a message from Gary, she wants to be able to demonstrate to Sue that the message actually came from Gary. What goal of cryptography is Patricia attempting to achieve? |
Non Repudiation |
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Which information security objective allows trusted entities to endorse information? |
Certification |
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Which approach to cryptography provides the strongest theoretical protection? |
Quantum cryptography |
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Which type of cipher works by rearranging the characters in a message? |
Transposition |
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Which set of characteristics describes the Caesar cipher accurately? |
Symmetric, stream, substitution |
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What is the only unbreakable cipher when it is used properly? |
Vernam |
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Which cryptographic attack offers cryptanalysts the most information about how an encryption algorithm works? |
Chosen plaintext |
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What mathematical problem forms the basis of most modern cryptographic algorithms? |
Factoring large primes |
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What is NOT an effective key distribution method for plaintext encryption keys? |
Unencrypted email |
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What type of function generates the unique value that corresponds to the contents of a message and is used to create a digital signature? |
Hash |
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Alice would like to send a message to Bob using a digital signature. What cryptographic key does Alice use to create the digital signature? |
Alice’s private key |
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Bob received a message from Alice that contains a digital signature. What cryptographic key does Bob use to verify the digital signature? |
Alice’s public key |
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What is NOT a symmetric encryption algorithm? |
Rivest-Shamir-Adelman (RSA) |
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What is NOT a valid encryption key length for use with the Blowfish algorithm? |
512 bits |
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What standard is NOT secure and should never be used on modern wireless networks? |
Wired Equivalent Privacy (WEP) |
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Which of the following allows a certificate authority (CA) to revoke a compromised digital certificate in real time? |
Online Certificate Status Protocol (OCSP) |
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Alice would like to send a message to Bob securely and wishes to encrypt the contents of the message. What key does she use to encrypt this message? |
Bobs public key |
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You must always use the same algorithm to encrypt information and decrypt the same information. |
False |
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An algorithm is a repeatable process that produces the same result when it receives the same input. |
True |
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A private key cipher is also called an asymmetric key cipher. |
False |
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The Diffie-Hellman (DHE) algorithm is the basis for several common key exchange protocols, including Diffie-Hellman in Ephemeral mode (DHE) and Elliptic Curve DHE (ECDHE). |
True |
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A physical courier delivering an asymmetric key is an example of in-band key exchange. |
True |
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Message authentication confirms the identity of the person who started a correspondence. |
False |
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A person demonstrates anonymity when posting information to a web discussion site without authorities knowing who he or she is. |
True |
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A substitution cipher replaces bits, characters, or blocks of information with other bits, characters, or blocks. |
True |
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A keyword mixed alphabet cipher uses a cipher alphabet that consists of a keyword, minus duplicates, followed by the remaining letters of the alphabet. |
True |
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Integrity-checking tools use cryptographic methods to make sure nothing and no one has modified the software. |
True |
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In a known-plaintext attack (KPA), the cryptanalyst has access only to a segment of encrypted data, and has no choice as to what that data might be. |
False |
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In a chosen-ciphertext attack, cryptanalysts submit data coded with the same cipher and key they are trying to break to the decryption device to see either the plaintext output or the effect the decrypted message has on some system. |
True |
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Digital signatures require asymmetric key cryptography. |
True |
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Cryptographic key distribution is typically done by phone. |
False |
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A salt value is a set of random characters you can combine with an actual input key to create the encryption key. |
True |
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The term certificate authority (CA) refers to a trusted repository of all public keys. |
False |
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Product cipher is an encryption algorithm that has no corresponding decryption algorithm. |
False |
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A digitized signature is a combination of a strong hash of a message and a secret key. |
False |
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The hash message authentication code (HMAC) is a hash function that uses a key to create a hash, or message digest. |
True |
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The financial industry created the ANSI X9.17 standard to define key management procedures. |
True |
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