WGU C839 Introduction to Cryptography (C839)

Shawn C839 - Intro to Cryptography, Exam Questions and answers, rated A+ binary to characters encoding methods - ASCII (8-bit values, up to 256 characters) and UTF-16 (16- bit values, up to 65,536 characters). Other encoding methods include hexadecimal, Base-64, and Base-58 Combination vs Permutation - both measure the possible combinations of outcomes combinations = not concerned with the order permutations = all options considered including sequence. Decryption - Cipher tex...

Intro to Crypto Key Terms C839. Exam Review. Full Coverage. VERIFIED. Cryptography the science of keeping information secret and safe by transforming it into a form that unintended recipients cannot understand using an algorithm (a series of mathematical operations) Cryptanalysis the art of breaking or "cracking" the protection provided through cryptography algorithms Cryptology the study and practice of both cryptography and cryptanalysis Plaintext a human-readable une...

WGU C839 Cryptography. Exam Review Questions and answers, rated A+ Kerckhoff's Principle A cryptosystem should be secure even if everything about the system, except the key, is public knowledge. Opposite of security by obscurity Modern Cryptographic Algorithm Types Asymmetric and Symmetric; Combine substitution and transposition Symmetric Cryptography Encryption that uses a single key to encrypt and decrypt a message Major issue is key exchange C=E(k,p) P=D(k,c)...

Intro to Cryptography WGU C839 Module 5, Exam Questions and answers. Graded A+ Finding any method to decrypt the message that is more efficient that simple brute force attempts. - -Breaking Ciphers Simply trying every possible key to decrypt a message - -Brute Force Using other techniques to attempt to derive the key, can be used to test the efficacy of a cryptographic algorithm. Frequently used to test hash algorithms for collisions. - -Cryptanalysis The most basic tool for breaki...

Intro to Cryptography WGU C839 Module 4, Exam Questions and answers. VERIFIED. These are usually the encryption of a message digest with the senders private key. In order to verify them, the recipient uses the senders public key. They are considered good if they provide the following. Authentication Integrity Non-repudiation - -Digital Signature It is a digital document that contains a public key and some information to allow your system to verify where they key came from. This...

Intro to Cryptography WGU C839 Module 2. Questions and answers, 100% Accurate. Rated A+ 128 bit Hash Function specified by RFC 1321 Designed to replace MD4 Is not collision resistant - -MD5 160 bit Hash Function There are three other version of this hash with 128, 256 and 320 bit algorithms. Developed to replace the original version which was found to have collision issues. Does not follow any standard or security policies or guidelines - -RIPEMD-160 192 bit hash function. ...

Cryptography C839 Set 1. Exam Questions and answers. Graded A+ Which block cipher modes can be used to turn a block cipher into a stream cipher? Select two. Counter Mode CTR and Output Feedback Mode OFB What are reasons certificates should have an expiration date? Select all that apply 1 Decreases risk of compromise 2 To facilitate recovery from compromise 3 Creates forced opportunity fo users to update certificate information. What phase of the certificate lifecycle does cer...

WGU C839 Exam Questions and answers, Graded A+. VERIFIED. Which encryption standard is approved by the National Security Agency (NSA) for classified information? Advanced Encryption Standard (AES Which National Security Agency (NSA) encryption algorithms are unevaluated commercial cryptographic components? Type 4 Which method is used to verify the validity of a certificate? Online Certificate Status Protocol (OCSP) What is used to protect an encryption key and deliver it q...