Jottings
Mathematical reasoning may be regarded rather schematically as the exercise of a combination of two facilities, which we may call intuition and ingenuity. -Alan M. Turing
Cryptography
To get started, one can consider the following resources:
Computationally secure cryptography
These cryptosystems are considered secure against the computation power offered by humans with pencil-paper, computers, and quantum computers.
Pencil-paper safe cryptography
Classical computer safe cryptography
Quantum computer safe cryptography
Unconditionally secure cryptography
Following are some of my jottings:
Quantum cryptography (placeholder)