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одноключевая криптосистема stresses
data.prot.	common-key cryptosystem (с одним секретным ключом шифрования и расшифрования); conventional system; one-key cryptosystem; one-key system; private key cryptosystem; private key system; secret-key system; shared key cryptosystem; shared key system; symmetric system
sec.sys.	classical cryptosystem; common key cryptosystem; conventional cryptosystem; hidden key cryptosystem; one key cryptosystem; secret-key cryptosystem; shared-key cryptosystem; single-key cryptosystem; symmetric cryptosystem

одноключевая криптосистема: 14 phrases in 2 subjects

Information security and data protection	7
Security systems	7