With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Wars of the Roses happened in the 15th century.
text_B: A birthday attack is a type of cryptographic attack that exploits the mathematics behind the birthday problem in probability theory .. cryptographic. cryptography. attack. cryptanalysis. mathematics. mathematics. birthday problem. birthday problem. probability theory. probability theory. This attack can be used to abuse communication between two or more parties .. attack. cryptanalysis. The attack depends on the higher likelihood of collisions found between random attack attempts and a fixed degree of permutations -LRB- pigeonholes -RRB- .. attack. cryptanalysis
not_related.