I. INTRODUCTION  
II. NEURAL NETWORKS, SYNCHRONIZATION AND CHAOS  
III. FUNDAMENTAL MODEL  
IV. OTHER BASIC MODELS  
V. TYPES OF ATTACKS  
VI. PARITY MACHINES  
VII. QUERIES, SYNAPTIC DEPTH AND ERRONEOUS INFORMATION  
VIII. OTHER RECENT STUDIES  
IX. ADDITIONAL FORMS OF NEURAL CRYPTOGRAPHY  
X. SUMMARY AND CONCLUSION