CRYPTOGRAPHY PRACTICE TEST
SOLUTIONS 2026 FULL ANSWERS
◍ Which algorithm is designated as a Type 2 product by the National
Security Agency (NSA)? Answer: SKIPJACK
◍ What is the most commonly used format for certificates? Answer:
X.509 v3 *Version 3*
◍ What is referenced to determine if a certificate has been revoked?
Answer: Certificate Revocation List *(CRL)*
◍ What needs to be installed on *end users' computers* to allow
them to *trust* applications that have been *digitally signed* by the
developer? Answer: Sender's public key *(DEVELOPER's)*
◍ Which type of certificate *must be certified by an authority* to
verify it with other participants? Answer: Public Certificate
◍ What is an attribute of the Rivest Cipher 4 (RC4) algorithm?
Answer: It requires a unique nonce. *(# used ONCE)*
◍ Which mode generates the key stream with a nonce and
incrementing value? Answer: Counter (CTR)
, *Generates the next keystream block* by encrypting successive
*values* of a "counter"
◍ Which mode is a stream algorithm that concatenates an
incrementing value with a nonce? Answer: Counter (CTR)
◍ Which key would an administrator use to encrypt data so *only the
CEO can decrypt it?* Answer: CEO's public key
Remember, when a specific person in an organization is the *ONLY*
one you want to *DECRYPT* something, you must have their
*PUBLIC* key
◍ What is the result of a hash function? Answer: Digest
◍ What is used to efficiently encrypt *large files?* Answer:
Symmetric encryption
◍ An administrator needs to encrypt the following word with the
Atbash cipher:
*security*
Which ciphertext is correct? Answer: hvxfirgb
SOLUTIONS 2026 FULL ANSWERS
◍ Which algorithm is designated as a Type 2 product by the National
Security Agency (NSA)? Answer: SKIPJACK
◍ What is the most commonly used format for certificates? Answer:
X.509 v3 *Version 3*
◍ What is referenced to determine if a certificate has been revoked?
Answer: Certificate Revocation List *(CRL)*
◍ What needs to be installed on *end users' computers* to allow
them to *trust* applications that have been *digitally signed* by the
developer? Answer: Sender's public key *(DEVELOPER's)*
◍ Which type of certificate *must be certified by an authority* to
verify it with other participants? Answer: Public Certificate
◍ What is an attribute of the Rivest Cipher 4 (RC4) algorithm?
Answer: It requires a unique nonce. *(# used ONCE)*
◍ Which mode generates the key stream with a nonce and
incrementing value? Answer: Counter (CTR)
, *Generates the next keystream block* by encrypting successive
*values* of a "counter"
◍ Which mode is a stream algorithm that concatenates an
incrementing value with a nonce? Answer: Counter (CTR)
◍ Which key would an administrator use to encrypt data so *only the
CEO can decrypt it?* Answer: CEO's public key
Remember, when a specific person in an organization is the *ONLY*
one you want to *DECRYPT* something, you must have their
*PUBLIC* key
◍ What is the result of a hash function? Answer: Digest
◍ What is used to efficiently encrypt *large files?* Answer:
Symmetric encryption
◍ An administrator needs to encrypt the following word with the
Atbash cipher:
*security*
Which ciphertext is correct? Answer: hvxfirgb
