Title	A deep learning model for recognition of complex Text-based CAPTCHAs
Author	Rafaqat Hussain Arain, Riaz Ahmed Shaikh, Abdullah Maitl, Kamlesh Kumar, Syed Safdar Ali Shah
Citation	Vol. 18  No. 2  pp. 103-107
Keywords	Bots, CAPTCHAs, CNN, HIPs, Text warping

Title	Optimized Hybrid Security Model using Base 64 Algorithm in conjunction with Substitution Cipher to Enhance Text Security
Author	Abdullah Maitlo, Rafaqat Hussain Arain, Riaz Ahmed Shaikh, Hidayatullah Shaikh, Mahmood Hussain Shah, Safdar Ali Shah, Mumtaz Hussain Mahar
Citation	Vol. 18  No. 3  pp. 93-98
Keywords	Information Security, Network Security, Encryption, Decryption, Substitution Cypher, Cryptography

Title	Verifying the Robustness of Text-based CAPTCHAs offered by Local E-Commerce Sites
Author	Rafaqat Hussain Arain, Riaz Ahmed Shaikh, Kamlesh Kumar, Abdullah Maitlo, Asadullah Kehar, Safdar Ali Shah, Hidayatullah Shiakh
Citation	Vol. 18  No. 9  pp. 79-84
Keywords	CATPCHAS, HIPs, Color Filling Segmentation, thinning, CNNs.