212-81 exam

The most common way steganography is accomplished is via which one of the following?A . rsb B. Isb C. msb D. asbView AnswerAnswer: B Explanation: lbs https://en.wikipedia.org/wiki/Bit_numbering#:~:text=In%20computing%2C%20the%20least%20significant,number%20is%20even%20or%20odd. The least significant bit (LSB) is the bit position in a binary integer giving the units value, that is, determining whether the number...

DES has a key space of what?A . 2^128 B. 2^192 C. 2^64 D. 2^56View AnswerAnswer: D Explanation: 2^56 https://en.wikipedia.org/wiki/Data_Encryption_Standard The Data Encryption Standard (DES) is a symmetric-key algorithm for the encryption of digital data. Although its short key length of 56 bits makes it too insecure for applications, it...

A non-secret binary vector used as the initializing input algorithm for encryption of a plaintext block sequence to increase security by introducing additional cryptographic variance.A . IV B. Salt C. L2TP D. NonceView AnswerAnswer: A Explanation: IV https://en.wikipedia.org/wiki/Initialization_vector In cryptography, an initialization vector (IV) or starting variable (SV) is a...

Which of the following is a type of encryption that has two different keys. One key can encrypt the message and the other key can only decrypt it?A . Block cipher B. Asymmetric C. Symmetric D. Stream cipherView AnswerAnswer: B Explanation: Asymmetric Public-key cryptography, or asymmetric cryptography, is a cryptographic...

The reverse process from encoding - converting the encoded message back into its plaintext format.A . Substitution B. Whitening C. Encoding D. DecodingView AnswerAnswer: D Explanation: Decoding Decoding - reverse process from encoding,converting the encoded message back into its plaintext format.

Original, unencrypted information is referred to as ____.A . text B. plaintext C. ciphertext D. cleartextView AnswerAnswer: B Explanation: plaintext https://en.wikipedia.org/wiki/Plaintext In cryptography, plaintext usually means unencrypted information pending input into cryptographic algorithms, usually encryption algorithms. Cleartext usually refers to data that is transmitted or stored unencrypted ("in clear").

Which analysis type is based on the statistics of the numbers of unique colors and close-color pairs in a 24-bit image, a method that analyzes the pairs of colors created by LSB embedding?A . Differential Analysis B. Discrete Cosine Transform C. Raw Quick Pair D. Chi squared analysisView AnswerAnswer: C...

Hash. Created by Ronald Rivest. Replaced MD4. 128 bit output size, 512 bit block size, 32 bit word size, 64 rounds. Infamously compromised by Flame malware in 2012.A . Keccak B. MD5 C. SHA-1 D. TIGERView AnswerAnswer: B Explanation: MD5 https://en.wikipedia.org/wiki/MD5 The MD5 message-digest algorithm is a widely used hash...

Which service in a PKI will vouch for the identity of an individual or company?A . CA B. CR C. KDC D. CBCView AnswerAnswer: A Explanation: CA https://en.wikipedia.org/wiki/Certificate_authority A certificate authority or certification authority (CA) is an entity that issues digital certificates. A digital certificate certifies the ownership of a...

Which of the following is the successor of SSL?A . GRE B. RSA C. IPSec D. TLSView AnswerAnswer: D Explanation: TLS https://en.wikipedia.org/wiki/Transport_Layer_Security#History_and_development TLS 1. 0 was first defined in RFC 2246 in January 1999 as an upgrade of SSL Version 3.0, and written by Christopher Allen and Tim Dierks of...