Test
Sprint 8: Advanced Cryptography
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Preguntas del test (25)
1Digital signatures rely on
- AHashing algorithms and symmetric keys
- BPrivate keys and symmetric keys
- CHashes and salts
- DHashes and private keys
2An important US federal standard that defines requirements for cryptographic devices and software is:
- ANIST SP800-53
- BSOX 404
- CGDPR
- DFIPS 140-2
3The hash value for a file is highly dependent on the bits of the input
- AVerdadero
- BFalso
4The length of a cryptographic hash is highly dependent on the size of the input
- AVerdadero
- BFalso
5HMAC is a method to provide integrity and authenticity that is resistant to man-in-the-middle attacks, using multiple keys
- AVerdadero
- BFalso
6A common format for digital certificates is called
- ASHA256
- BAES256
- C802.11
- DX.509
7In a PKI, the entity that creates, signs, issues, stores, and revokes certificates is called
- AThe General Authority
- BThe Registrar
- CThe Central Authority
- DThe Certificate Authority
8Most modern encryption relies on the following mathematical properties for security
- AFourier transforms
- BThe difficulty of factoring the product of large prime numbers
- CAlgebraic analysis of non-Euclidean Reimannian Manifolds
- DFermat's last Theorem
9A SHA512 hash is computed for a file that is 4096 KB in size. A single bit at the end of the file is changed from a 1 to a 0. This represents three one-thousandths of a percent of change (0.003%). How many bits of the hash value can we expect to change if we compute it now?
- A1
- B32
- C64
- D128
10Digital signatures involve
- AHashing a message and encrypting the hash with a symmetric key
- BHashing a symmetric key and encrypting it with the recipient's public key
- CEncrypting a file with a cryptographic hashing algorithm
- DHashing a message and encrypting the hash with the sender's secret key
11Public Key Encryption
- AIs faster than symmetric encryption
- BReduces the complexity of key distribution and management
- CReduces an arbitrary number of bits of input into a uniform size of output bits
- DUses checksums to provide integrity of keys
12Digital Certificates are used to (check all that apply)
- ABind an entity to a public key
- BEstablish identity of an entity such as a server, company, or individual
- CEncrypt symmetric keys
- DExchange secret keys
13A system for managing cryptographic keys, certificates, and identities is called
- APrivate Key Infrastructure
- BPublic Key Infrastructure
- CSymmetric Key Infrastructure
- DPublic Hashing Systems
14Information contained in an X.509 certificate includes (check all that apply)
- ASerial number
- BValid dates/times
- CAlgorithms used
- DEntity name and public key
- EIssuer's private key
15In a PKI, entity that verifies the identity of entities requesting their digital certificates to be stored by the CA
- AThe Certificate Authority
- BThe General Authority
- CThe Registration Authority
- DThe Central Authority
16An advantage of Elliptic Curve Cryptography (ECC) is
- AHigher security due to the longer bit lengths of ECC
- BFaster encryption rates due to the dual keys used in ECC
- CECC is better for signatures due to its linearity
- DECC can be much shorter than other keys (like RSA) but equivalent in strength
17Secure hashing functions (check all that apply)
- ATake any number of bits as input and output a fixed length of bits
- BUse two related keys to encrypt and decrypt data
- CAre deterministic, producing the same output given identical input
- DAre computationally infeasible to reverse, i.e., determining the input when only given output is very difficult
18A method for providing integrity and authenticity for a message using both a hash and a shared secret is called
- AA MAC (Message Authentication Code)
- BA hash
- CA cryptographic token
- DA private key
19A company computes a hash value for a message. They then encrypt the hash with the company's secret asymmetric encryption key They send the unencrypted message along with the encrypted hash to a recipient. We can say that the message is:
- AConventionally encrypted
- BHash-encrypted
- CDigitally signed
- DAsymmetrically hashed
20Public Key Encryption
- AUses two related keys to encrypt and decrypt messages
- BIs slower than asymmetric encryption
- CUses one key for both encryption and decryption
- DReduces an arbitrary number of bits of input into a uniform size of output bits
21A MIC is a
- AMessage Identifier Code
- BMathematical Integrity Cipher
- CMessage Integrity Code
- DMedium Intensity Cipher
22Cryptographic Hashes are used to provide
- AIntegrity over messages and files
- BConfidentiality of messages
- CAuthenticity of sender for messages
- DAuthorization
23Digital signatures provide
- AIntegrity and non-repudiation
- BIntegrity and availability
- CAuthorization and confidentiality
- DIntegrity and confidentiality
24Symmetric Encryption
- AReduces an arbitrary number of bits of input into a uniform size of output bits
- BUses two related keys to encrypt and decrypt messages
- CIs slower than asymmetric encryption
- DUses one key for both encryption and decryption
25In order to efficiently encrypt large messages, while securely distributing encryption keys, we can:
- AUse symmetric encryption to encrypt the message. Then use a recipient's public key to encrypt the symmetric key, and send the encrypted message and key
- BUse asymmetric encryption to encrypt the message and send it to recipient
- CUse a cryptographic secure hash to encrypt a symmetric key and send it to the recipient
- DUse symmetric encryption to sign the message and a public key to encrypt the hash
Información
- Descripción
- Test sobre Sprint 8: Advanced Cryptography, creado por Forrest M. Graeber el 25/06/2019.
- Autor
- Forrest M. Graeber
- Idioma
- English
- Visitas
- 3
- Valoración
- Aún sin valoraciones Valora este test