Question

Creating SHA-1 Hashes. Provide a screenshot for each of questions 3a – 3d.

a. Create a SHA-1 hash of your last name using the code on page 43 in your lab book. Put your name in all lowercase letters. Is the MD the same length as your last name? (20 points)

b. Using the up arrow, change the first character of your last name to be an uppercase letter. Changing one character in your last name changes how many characters in the MD? (20 points)

c. Create a SHA-1 hash for the following text: Itwasthebestoftimesitwastheworstoftimesitwastheageofwisdomitwastheageoffool ishnessitwastheepochofbeliefitwastheepochofincredulityitwastheseasonoflightitwasthes easonofdarknessitwasthespringofhopeitwasthewinterofdespair (20 points)

d. Compare the length of this MD with the MD of your last name. What conclusions can you draw from the MDs? (20 points)

Answer 1

Here is the snippet of the code that is used to create the Message Digest for the SHA-1 Hashing algortihm.

Note: Since no code is provided to calculate, the Crypto library in nodeJS is used to create the MD for the string.

//importing the crypto library
var crypto = require('crypto');

//creating hash object 
var hash = crypto.createHash('sha1');

//input string
data = hash.update('sutariya', 'utf-8');

//Creating MD in hex
generate_hash= data.digest('hex');

//Printing the output
console.log("hash : " + generate_hash);

Question-1)

• The MD created by SHA-1 algorithm for my last name 'sutariya' in lowercase is a8d0a208f6051bbf1f96df52753035f502ecd27e.
• The MD created is not the same length as my last name.

Ques-2 )

• On changing the first character to uppercase the MD created is : 6b3fb6a9385b0c07e6d3ac204c850137de03409e
• On changing only the first character all the characters in MD are changed except the last character.

Ques-3)

• Hash created for the given string without spaces is  : 1109f966c316116c967fecbacd4bc29b2c015930.

Question-4)

• On comparing the MD from last name and the given string we can say that the MD created is irrespective of the length of string data provided. SHA1 hashing algorithm always produces a MD of 160 bits.