C839 - Pre-Assessment: Introduction to Cryptography. Exam Questions and answers, rated A+

C839 - Pre-Assessment: Introduction to Cryptography. Exam Questions and answers, rated A+ Which encryption standard uses the same key to encrypt and decrypt messages? - Symmetric Key Encryption Which algorithm is designated as a Type 2 product by the National Security Agency (NSA)? - SKIPJACK What is the most commonly used format for certificates? - X.509 v3 *Version 3* What is referenced to determine if a certificate has been revoked? - 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? - Sender's public key *(DEVELOPER's)* Which type of certificate *must be certified by an authority* to verify it with other participants? - Public Certificate What is an attribute of the Rivest Cipher 4 (RC4) algorithm? - It requires a unique nonce. *(# used ONCE)* Which mode generates the key stream with a nonce and incrementing value? - 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? - Counter (CTR) Which key would an administrator use to encrypt data so *only the CEO can decrypt it?* - 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