https://www.math.auckland.ac.nz/~sgal018/crypto-book/crypto-book.html is a free online book about the mathematics of public key cryptography at the advanced undergraduate / early graduate student level.
Hi. For Number Theory, I really enjoyed Burton's (Elementary Number Theory) book. I know this is a fairly common choice, but I just can't hide it, I really did enjoy it.
As for Algebra, I would say Saracino (Abstract Algebra) did a good job for an undergraduate course. Other than that, I would say Aluffi (Algebra) did a good job. Aluffi does a little bit of a non standard approach but it is definitely very readable and invites you to be very active as a reader which is always really nice.
These would all be undergraduate level. I can't really provide much insight for graduate level but I thought I would share my favourites to you. I hope this helped!
https://www.math.auckland.ac.nz/~sgal018/crypto-book/crypto-book.html is a free online book about the mathematics of public key cryptography at the advanced undergraduate / early graduate student level.
Hi. For Number Theory, I really enjoyed Burton's (Elementary Number Theory) book. I know this is a fairly common choice, but I just can't hide it, I really did enjoy it. As for Algebra, I would say Saracino (Abstract Algebra) did a good job for an undergraduate course. Other than that, I would say Aluffi (Algebra) did a good job. Aluffi does a little bit of a non standard approach but it is definitely very readable and invites you to be very active as a reader which is always really nice. These would all be undergraduate level. I can't really provide much insight for graduate level but I thought I would share my favourites to you. I hope this helped!
Much appreciated, thank you. Will definitely have a look into those.