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Web Backend Security Headers - 1. CSP Headers

Table of Contents Web Backend Security Headers CSP Headers CSRF Headers HSTS X-Frame-Options and X-XSS-Protection DNS records and SPF Background Content Security Policy (CSP) is a security standard introduced to prevent cross-site scripting, clickjacking and other code injection attacks.

March 13, 2021

Paint adjacent boundaries with distinct colors

... = set(['red','blue','white','yellow','green']) def selectUnassignedVariable(assignment, csp): # Minimum Remaining Variable - Choose the variable with the smallest domain # count keeps track of the smallest length of domains count = 0 # select_country keeps track of the country with the domain of smallest length select_country = False for country in assignment: if len(assignment[country]) > 1: # count should only be 0 at initialization if count is 0 or count > len(assignment[country]): count = len(assignment[country]) select_country = country return select_country def orderDomainValues(): # Unordered return domain """ def inference (csp, var, value, assignment): # Forward checking for adj_c in csp[var]: # for each adjacent country to the current country represented by 'var' if value is assignment[adj_c]: # if this color is exactly the only color that this adjacent country has in the domain return False elif (value in assignment[adj_c]): # otherwise check if this color is a subset of the adjacent countrys domain assignment[adj_c].

December 11, 2014

Web Backend Security Headers -3. HSTS

Table of Contents Web Backend Security Headers CSP Headers CSRF Headers HSTS X-Frame-Options and X-XSS-Protection DNS records and SPF Background HTTP Strict Transport Security (HSTS) is a web security policy mechanism that helps to protect websites against man-in-the-middle attacks such as protocol downgrade attacks and cookie hijacking.

March 14, 2021