univ - vari
- universal
- universal key
- unkeyed
- unkeyed device is unclassified
- unknown
- unknown key
- unlock
- unlock a cipher
- unlock information guarded by cryptography
- unorthodox
- unorthodox linear transform
- unpredictable
- unpredictable key
- unpublished
- unpublished algorithm
- unpublished key
- unreadable
- unreadable key
- unscrambled
- untappable
- untappable channel
- untrustworthy
- untrustworthy participant
- unusually
- unusually good simultaneous diophantine approximation
- update
- update a key
- updated
- updated key
- updation
- updation of cryptographic keys
- upgrade
- upgrade cipher communications
- upper
- upper bound
- use
- use of codes, and ciphers
- use of encryption
- use strong cryptography
- use the same key in both directions
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