Certified Encryption Specialist Practice Questions and
Answers Rated A
What type of encryption uses different keys to
encrypt and decrypt the message? Which of the following is not an asymmetric
system?
+Secure
+Asymmetric +SSL
+Private key +DES
+Symmetric - ANSWER -Asymmetric +PGP
+RSA - ANSWER -DES
Asymmetric cryptography, also known as public
key cryptography, uses public and private keys to The Data Encryption Standard is a symmetric-
encrypt and decrypt data. key algorithm for the encryption of electronic
data. Although now considered insecure, it was
highly influential in the advancement of modern
The most widely used asymmetric encryption cryptography.
algorithm is what?
+Caesar Cipher In order for User A to send User B an encrypted
+Vigenere message that only User B can read, User A must
+RSA encrypt message with which of the following
+DES - ANSWER -RSA keys?
The RSA encryption algorithm is one of the most +User B's public key
widely used public key encryption algorithms that +User B's private key
have ever been invented. It was created by the +User A's public key
three scientists Ronald Rivest, Adi Shamir, and +User A's private key - ANSWER -USER
Leonard Adleman in 1977, and today it is B's Public Key
increasingly being used in the network area.
Public key cryptography, or asymmetrical
cryptography, is any cryptographic system that
Original, unencrypted information is referred to uses pairs of keys: public keys which may be
as ____. disseminated widely, and private keys which are
known only to the owner
+text
+plaintext
+cleantext The greatest weakness with symmetric
+ciphertext - ANSWER -Plaintext algorithms is _____.
Plaintext is a term used in cryptography that +The problem of key exchange
refers to a message before encryption or after +The problem of generating keys
decryption. That is, it is a message in a form that +They are slower than asymmetric
is easily readable by humans. Encryption is the +They are less secure than asymmetric -
process of obscuring messages to make them ANSWER -The Problem of Key exchange
unreadable in the absence special knowledge
The biggest problem with symmetric key
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, Certified Encryption Specialist Practice Questions and
Answers Rated A
encryption is that you need to have a way to get
the key to the party with whom you are sharing Diffie-Hellman key exchange is a method of
data. securely exchanging cryptographic keys over a
public channel and was one of the first public-key
protocols as originally conceptualized by Ralph
Which of the following is generally true about Merkle and named after Whitfield Diffie and
block sizes? Martin Hellman. DH is one of the earliest practical
examples of public key exchange implemented
+Block size is irrelevant to security within the field of cryptography.
+Block sizes must be more than 256 bits to be
secure
+Larger block sizes increase security A _________ is a digital representation of
+Smaller block sizes increase security - information that identifies you as a relevant entity
ANSWER -Larger Block sizes increase by a trusted third party?
security
+Ownership stamp
Larger block sizes do increase security, however +Digest
at the cost of processing power and encryption +Digital Signature
time. +Hash - ANSWER -Digital Signature
A digital signature is a mathematical scheme for
A _____ is a function that takes a variable-size demonstrating the authenticity of digital
input m and returns a fixed-size string. messages or documents
+Hash
+Symmetric cipher What is the standard used by most digital
+Feistel certificates?
+Asymmetric cipher - ANSWER -Hash
+RFC 2298
A hash function is any function that can be used +OCSP
to map data of arbitrary size to data of fixed size. +X.509
The values returned by a hash function are +CRL - ANSWER -x.509
called hash values, hash codes, digests, or
simply hashes. In cryptography, X.509 is a standard that defines
the format of public key certificates.
Which of the following is a cryptographic protocol
that allows two parties to establish a shared key DES uses keys of what size?
over an insecure channel?
+56 bits
+Elliptic Curve +192 bits
+MD5 +128 bits
+RSA +64 bits - ANSWER -56 bits
+Diffie-Hellman - ANSWER -Diffie-Hellman
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Answers Rated A
What type of encryption uses different keys to
encrypt and decrypt the message? Which of the following is not an asymmetric
system?
+Secure
+Asymmetric +SSL
+Private key +DES
+Symmetric - ANSWER -Asymmetric +PGP
+RSA - ANSWER -DES
Asymmetric cryptography, also known as public
key cryptography, uses public and private keys to The Data Encryption Standard is a symmetric-
encrypt and decrypt data. key algorithm for the encryption of electronic
data. Although now considered insecure, it was
highly influential in the advancement of modern
The most widely used asymmetric encryption cryptography.
algorithm is what?
+Caesar Cipher In order for User A to send User B an encrypted
+Vigenere message that only User B can read, User A must
+RSA encrypt message with which of the following
+DES - ANSWER -RSA keys?
The RSA encryption algorithm is one of the most +User B's public key
widely used public key encryption algorithms that +User B's private key
have ever been invented. It was created by the +User A's public key
three scientists Ronald Rivest, Adi Shamir, and +User A's private key - ANSWER -USER
Leonard Adleman in 1977, and today it is B's Public Key
increasingly being used in the network area.
Public key cryptography, or asymmetrical
cryptography, is any cryptographic system that
Original, unencrypted information is referred to uses pairs of keys: public keys which may be
as ____. disseminated widely, and private keys which are
known only to the owner
+text
+plaintext
+cleantext The greatest weakness with symmetric
+ciphertext - ANSWER -Plaintext algorithms is _____.
Plaintext is a term used in cryptography that +The problem of key exchange
refers to a message before encryption or after +The problem of generating keys
decryption. That is, it is a message in a form that +They are slower than asymmetric
is easily readable by humans. Encryption is the +They are less secure than asymmetric -
process of obscuring messages to make them ANSWER -The Problem of Key exchange
unreadable in the absence special knowledge
The biggest problem with symmetric key
1/8
, Certified Encryption Specialist Practice Questions and
Answers Rated A
encryption is that you need to have a way to get
the key to the party with whom you are sharing Diffie-Hellman key exchange is a method of
data. securely exchanging cryptographic keys over a
public channel and was one of the first public-key
protocols as originally conceptualized by Ralph
Which of the following is generally true about Merkle and named after Whitfield Diffie and
block sizes? Martin Hellman. DH is one of the earliest practical
examples of public key exchange implemented
+Block size is irrelevant to security within the field of cryptography.
+Block sizes must be more than 256 bits to be
secure
+Larger block sizes increase security A _________ is a digital representation of
+Smaller block sizes increase security - information that identifies you as a relevant entity
ANSWER -Larger Block sizes increase by a trusted third party?
security
+Ownership stamp
Larger block sizes do increase security, however +Digest
at the cost of processing power and encryption +Digital Signature
time. +Hash - ANSWER -Digital Signature
A digital signature is a mathematical scheme for
A _____ is a function that takes a variable-size demonstrating the authenticity of digital
input m and returns a fixed-size string. messages or documents
+Hash
+Symmetric cipher What is the standard used by most digital
+Feistel certificates?
+Asymmetric cipher - ANSWER -Hash
+RFC 2298
A hash function is any function that can be used +OCSP
to map data of arbitrary size to data of fixed size. +X.509
The values returned by a hash function are +CRL - ANSWER -x.509
called hash values, hash codes, digests, or
simply hashes. In cryptography, X.509 is a standard that defines
the format of public key certificates.
Which of the following is a cryptographic protocol
that allows two parties to establish a shared key DES uses keys of what size?
over an insecure channel?
+56 bits
+Elliptic Curve +192 bits
+MD5 +128 bits
+RSA +64 bits - ANSWER -56 bits
+Diffie-Hellman - ANSWER -Diffie-Hellman
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