With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Luxembourg is about the same size as Northamptonshire, England.
text_B: CCM mode -LRB- Counter with CBC-MAC -RRB- is a mode of operation for cryptographic block ciphers .. CBC-MAC. CBC-MAC. mode of operation. block cipher modes of operation. It is an authenticated encryption algorithm designed to provide both authentication and confidentiality .. authenticated encryption. authenticated encryption. authentication. authentication. confidentiality. confidentiality. CCM mode is only defined for block ciphers with a block length of 128 bits .. The nonce of CCM must be carefully chosen to never be used more than once for a given key .. nonce. Cryptographic nonce. This is because CCM is a derivation of CTR mode and the latter is effectively a stream cipher .. CTR mode. block cipher modes of operation#Counter .28CTR.29. stream cipher. stream cipher
not_related.