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March 22nd, 2018, 05:44 PM  #1 
Newbie Joined: Jan 2018 From: Toronto Posts: 12 Thanks: 0  Encrypting a Message Manually
I used CrypTool RSA encryption to encrypt my name. The ask is to show that CrypTool RSA encryption works by encrypting the first block of the message. I am to use only multiplication and squaring operations. In order to make this process manageable, use “reduction by modulo” property, that is, (a × b) mod N = (a mod N) × (b mod N) mod N In CrypTool I encrypted my name using RSA with a small modulus N 22750 # 20613 # 66121 # 55710. I don't understand how to use (a × b) mod N = (a mod N) × (b mod N) mod N to manually encrypt the first block. Any suggestions and help is greatly appreciated. Thank you in Advance. 
March 23rd, 2018, 04:53 AM  #2 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 12,074 Thanks: 794  

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