Table of Contents

## How do you convert time series in R?

Creating a time series The ts() function will convert a numeric vector into an R time series object. The format is ts(vector, start=, end=, frequency=) where start and end are the times of the first and last observation and frequency is the number of observations per unit time (1=annual, 4=quartly, 12=monthly, etc.).

## What does XTS do in R?

eXtensible Time Series (xts) is a powerful package that provides an extensible time series class, enabling uniform handling of many R time series classes by extending zoo.

## What is a XTS object?

Details. An xts object extends the S3 class zoo from the package of the same name. Similar to zoo objects, xts objects must have an ordered index. While zoo indexes cannot contain duplicate values, xts objects have optionally supported duplicate index elements since version 0.5-0.

## What is the size of the XTS AES key?

The key sizes supported include a 256-bit key size (denoted XTS-AES128) and a 512-bit key size (denoted XTS-AES256).

## Is BitLocker AES 256?

Is it configurable? BitLocker uses Advanced Encryption Standard (AES) as its encryption algorithm with configurable key lengths of 128 bits or 256 bits. The default encryption setting is AES-128, but the options are configurable by using Group Policy.

## How many encryption keys does LRW use?

While the AES key length is 256 bits, LRW+AES pair uses 256+128 = 384 bits key.

## What are encryption modes?

Two encryption modes are: Block Mode , a method of encryption in which the message is broken into blocks and the encryption occurs on each block as a unit. Since each block is at least 8 bytes large, block mode provides the ability for 64-bit arithmetic in the encryption algorithm.

## Which block cipher mode would you use for full disk encryption?

AES

## What is the block size in the simplified AES algorithm?

16 bits

## What is the key size in the AES algorithm?

Advanced Encryption Standard (AES) keys are symmetric keys that can be three different key lengths (128, 192, or 256 bits). AES is the encryption standard that is recognized and recommended by the US government. The 256-bit keys are the longest allowed by AES.

## What is the function of Feistel cipher?

Feistel Cipher model is a structure or a design used to develop many block ciphers such as DES. Feistel cipher may have invertible, non-invertible and self invertible components in its design. Same encryption as well as decryption algorithm is used. A separate key is used for each round.