Is the cipher used by soviet spy Richard Sorge still sufficiently secure nowadays?

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    $\begingroup$ Comments are not for extended discussion; this conversation has been moved to chat. $\endgroup$ – Maarten Bodewes Mar 5 '19 at 12:06
  • $\begingroup$ Can you be more specific about what cipher you're referring to? $\endgroup$ – Squeamish Ossifrage Mar 7 '19 at 6:12
  • $\begingroup$ @SqueamishOssifrage He used a cipher where the plaintext was first encoded with a straddling checkerboard and then an additive was derived from a statistical yearbook which contained many numbers $\endgroup$ – user65597 Mar 7 '19 at 9:34

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