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| Russian | English |
| в закрытом конверте | under closed cover |
| закрытая схема нумерации | closed numbering scheme |
| закрытый канал связи | secure channel (What use is a key communicated over an absolutely secure channel if you let someone look over your shoulder... VLZ_58) |
| контора закрыта | office closed (международный код абонентского телеграфирования) |
| по закрытому каналу | on a discreet channel (I'm speaking to you on a discreet channel. • He assumed they were talking on a discreet channel. • I've got a call for you on the discreet channel. Press the green button. 4uzhoj) |