1. Of or relating to cryptanalysis
   - cryptanalytic, cryptographic, cryptologic, cryptological

See also: cryptography

• first and last
• first appearance
• first balcony
• First Baron Beveridge
• First Baron Kelvin
• First Baron Lytton
• First Baron Macaulay
• First Baron Marks of Broughton
• First Baron Passfield
• First Baron Rutherford
• First Baron Rutherford of Nelson
• First Baron Tennyson
• first base
• first baseman
• first battle of Ypres
• first blush
• first cause
• First Council of Constantinople
• First Council of Lyons
• First Council of Nicaea
• first cousin
• first cranial nerve
• First Crusade
• first degree
• first derivative