WGU Introduction to Cryptography - C839 (EC-Council CES) Exam Questions with Correct
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Diffie-Hellman first publicly described asymmetric algorithm.
allow parties to exchange a symmetric key over unsecure medium, such as the internet
RSA most widely used asymmetric encryption algorithm.
1977 by three mathematicians, Ron Rivest, Adi Shamir, and Len Adleman.
RSA is based on large prime numbers.
RSA can use 1024, 2048, 4096 bit and larger keys.
Menezes-Qu-Vanstone based on on Diffie-Hellman. It was first proposed by Menezes, Qu,
and Vanstone in 1995 and was thenmodified in 1998. It is incorporated in the public key
standard IEEE P1363. HQMV is an
improved version.
DSA U.S. Patent 5,231,668, filed July 26, 1991, and attributed to David W. Kravitz. It was
adopted by the U.S. government in 1993 with FIPS 186.
Elliptic Curve 1985 by Victor Miller (IBM) and Neil Koblitz
The security of Elliptic Curve cryptography is based on the fact that finding the discrete
logarithm of a random elliptic curve element with respect to a publicly known base point is
difficult to the point of being impracticable.
,y2 = x3 + Ax + B
Elliptic Curve Variations Elliptic Curve Diffie Hellman (used for key exchange)
Elliptic Curve Digital Signature Algorithm (ECDSA)
Elliptic Curve MQV key agreement protocol
El gamal This algorithm is based on Diffie-Hellman and was invented in 1984 by Taher
Elgamal.
to many possible It is used in some PGP implementations as well as GNU Privacy Guard
software.
three parts: the key generator, the encryption algorithm, and the decryption algorithm
Elgamal encryption is probabilistic
probabilistic any given plaintext can be encrypted to many possible ciphertexts.
asymmetric encryption algoriths RSA, DSA, Diffie-Hellman, Elliptic Curve, El gamal
Digital Signatures not used to ensure the confidentiality of a message, but rather to
guarantee who sent the message.
the sender encrypts something with his or her private key, and is decrypted with their public
key.
, Digital Certificate A digital certificate contains a public key and some means to verify whose
public key it is.
representation of information that identifies you as a relevant entity by a trusted third party
Certification Authority entity trusted by one or more users to manage certificates.
trusted third party
primary role of the CA is to digitally sign and
publish the public key bound to a given user.
Registration Authority used to take the burden off of a CA by handling verification prior to
certificates being issued. RA acts as a proxy between user and CA. RA
RA (Registration Authority) is used to take the burden off of a CA by handling verification prior
to certificates being issued.
certificate Policy rules that define how a certificate may be used.
PKCS (Public Key Cryptography Standards) in place by RSA to ensure uniform certificate
management throughout the internet.
X.509 international standard for the format and information contained in a digital cert.
The most common type of digital certificate in the world.
Relied on by S/MIME
Answers| Latest Update Guaranteed Success
Diffie-Hellman first publicly described asymmetric algorithm.
allow parties to exchange a symmetric key over unsecure medium, such as the internet
RSA most widely used asymmetric encryption algorithm.
1977 by three mathematicians, Ron Rivest, Adi Shamir, and Len Adleman.
RSA is based on large prime numbers.
RSA can use 1024, 2048, 4096 bit and larger keys.
Menezes-Qu-Vanstone based on on Diffie-Hellman. It was first proposed by Menezes, Qu,
and Vanstone in 1995 and was thenmodified in 1998. It is incorporated in the public key
standard IEEE P1363. HQMV is an
improved version.
DSA U.S. Patent 5,231,668, filed July 26, 1991, and attributed to David W. Kravitz. It was
adopted by the U.S. government in 1993 with FIPS 186.
Elliptic Curve 1985 by Victor Miller (IBM) and Neil Koblitz
The security of Elliptic Curve cryptography is based on the fact that finding the discrete
logarithm of a random elliptic curve element with respect to a publicly known base point is
difficult to the point of being impracticable.
,y2 = x3 + Ax + B
Elliptic Curve Variations Elliptic Curve Diffie Hellman (used for key exchange)
Elliptic Curve Digital Signature Algorithm (ECDSA)
Elliptic Curve MQV key agreement protocol
El gamal This algorithm is based on Diffie-Hellman and was invented in 1984 by Taher
Elgamal.
to many possible It is used in some PGP implementations as well as GNU Privacy Guard
software.
three parts: the key generator, the encryption algorithm, and the decryption algorithm
Elgamal encryption is probabilistic
probabilistic any given plaintext can be encrypted to many possible ciphertexts.
asymmetric encryption algoriths RSA, DSA, Diffie-Hellman, Elliptic Curve, El gamal
Digital Signatures not used to ensure the confidentiality of a message, but rather to
guarantee who sent the message.
the sender encrypts something with his or her private key, and is decrypted with their public
key.
, Digital Certificate A digital certificate contains a public key and some means to verify whose
public key it is.
representation of information that identifies you as a relevant entity by a trusted third party
Certification Authority entity trusted by one or more users to manage certificates.
trusted third party
primary role of the CA is to digitally sign and
publish the public key bound to a given user.
Registration Authority used to take the burden off of a CA by handling verification prior to
certificates being issued. RA acts as a proxy between user and CA. RA
RA (Registration Authority) is used to take the burden off of a CA by handling verification prior
to certificates being issued.
certificate Policy rules that define how a certificate may be used.
PKCS (Public Key Cryptography Standards) in place by RSA to ensure uniform certificate
management throughout the internet.
X.509 international standard for the format and information contained in a digital cert.
The most common type of digital certificate in the world.
Relied on by S/MIME
