I have a number theory class but my professor just put the homework about RSA encryption where we have absolutely no clue how to do, here's the two question, help appreciated:
a) A word has been broken into blocks of two letters and converted to two-digit numbers using the correspondence:
The blocks are then encoded using the public key code with base 87 and exponent 19. The coded message is $04/10$. Find the word which was coded.
b) A public key code has base 143 and exponent 103. It uses the following letter-to-number equivalents:
A message has been converted to numbers and broken into blocks. When coded using the above base and exponent the message sent is $10/03$. Decode the message.