Definition of one–time pad
: a random-number additive or mixed keying sequence to be used for a single coded message and then destroyed
Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.
Join MWU now and get access to America’s largest dictionary, with:
- 300,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Origin and Etymology of one–time pad
probably from its original form's being a pad of keys whose sheets were torn off and discarded after a single use
First Known Use: 1953
Seen and Heard
What made you want to look up one–time pad? Please tell us where you read or heard it (including the quote, if possible).