Ostia, Mary Grace, Alessa L. Crisostomo, David Jhozel R. Lucas, Francis Arlando L. Atienza, Raymund M. Dioses, Jamillah S. Guialil, Leisyl M. Mahusay, & Jonathan Morano. " An Enhancement of Text Encryption Algorithm with Hybrid Two-Square Cipher and Columnar Transposition Cipher." International Journal of Computing Sciences Research [Online], 8 (2024): 3202-3216. Web. 21 Nov. 2024