An official website of the United States government
Here's how you know
Official websites use .gov
A
.gov
website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A
lock (
lock
)
or
https://
means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Skip to main content (Press Enter).
Toggle navigation
National Security Agency/Central Security Service
NSA/CSS
Search
Search NSA:
Search
Search NSA:
Search
About
Leadership
Mission & Combat Support
Cybersecurity
Signals Intelligence
Central Security Service
Locations
Research
Diversity, Equity, Inclusion & Accessibility
Cybersecurity Collaboration Center
Collaborative Partnerships
Enduring Security Framework
DIB Cybersecurity Services
Standards and Certifications
Artificial Intelligence Security Center
Press Room
Press Releases & Statements
News & Highlights
Declassification & Transparency Initiatives
Cybersecurity Advisories & Guidance
Telework and Mobile Security Guidance
DoD Microelectronics Guidance
Research Publications
Careers
Innovation
WorkLifeBalance
History
National Cryptologic Museum
Cryptologic History
National Cryptologic Memorial
Ask Zelda
Search
Search
Upload Date
Upload Date
Document Date
Title
Share
The Unbreakable Cipher
Spring 1961 - Vol. VI, No. 2
Download Image:
Full Size (2.09 MB)
Tags:
Photo by:
Manuel J Marien |
VIRIN:
THE-UNBREAKABLE-CIPHER.PDF
Photo Gallery
Communicators
Search
Search
Upload Date
Upload Date
Document Date
Title
Share
The Unbreakable Cipher
Spring 1961 - Vol. VI, No. 2
Download Image:
Full Size (2.09 MB)
Tags:
Photo by:
Manuel J Marien |
VIRIN:
THE-UNBREAKABLE-CIPHER.PDF
Photo Gallery
Cryptologic Almanac Articles
Search
Search
Upload Date
Upload Date
Document Date
Title
Share
The Unbreakable Cipher
Spring 1961 - Vol. VI, No. 2
Download Image:
Full Size (2.09 MB)
Tags:
Photo by:
Manuel J Marien |
VIRIN:
THE-UNBREAKABLE-CIPHER.PDF
Photo Gallery
Cryptologic Histories
Search
Search
Upload Date
Upload Date
Document Date
Title
Share
The Unbreakable Cipher
Spring 1961 - Vol. VI, No. 2
Download Image:
Full Size (2.09 MB)
Tags:
Photo by:
Manuel J Marien |
VIRIN:
THE-UNBREAKABLE-CIPHER.PDF
Photo Gallery
Cryptologic Quarterly
Search
Search
Upload Date
Upload Date
Document Date
Title
Share
The Unbreakable Cipher
Spring 1961 - Vol. VI, No. 2
Download Image:
Full Size (2.09 MB)
Tags:
Photo by:
Manuel J Marien |
VIRIN:
THE-UNBREAKABLE-CIPHER.PDF
Photo Gallery
Cryptologic Quarterly Articles
Search
Search
Upload Date
Upload Date
Document Date
Title
Share
The Unbreakable Cipher
Spring 1961 - Vol. VI, No. 2
Download Image:
Full Size (2.09 MB)
Tags:
Photo by:
Manuel J Marien |
VIRIN:
THE-UNBREAKABLE-CIPHER.PDF
Photo Gallery
Cryptologic Spectrum Articles
Search
Search
Upload Date
Upload Date
Document Date
Title
Share
The Unbreakable Cipher
Spring 1961 - Vol. VI, No. 2
Download Image:
Full Size (2.09 MB)
Tags:
Photo by:
Manuel J Marien |
VIRIN:
THE-UNBREAKABLE-CIPHER.PDF
Photo Gallery
Cryptologs
Search
Search
Upload Date
Upload Date
Document Date
Title
Share
The Unbreakable Cipher
Spring 1961 - Vol. VI, No. 2
Download Image:
Full Size (2.09 MB)
Tags:
Photo by:
Manuel J Marien |
VIRIN:
THE-UNBREAKABLE-CIPHER.PDF
Photo Gallery
History of the Army Security Agency
Search
Search
Upload Date
Upload Date
Document Date
Title
Share
The Unbreakable Cipher
Spring 1961 - Vol. VI, No. 2
Download Image:
Full Size (2.09 MB)
Tags:
Photo by:
Manuel J Marien |
VIRIN:
THE-UNBREAKABLE-CIPHER.PDF
Photo Gallery
History Today Anthologies
Search
Search
Upload Date
Upload Date
Document Date
Title
Share
The Unbreakable Cipher
Spring 1961 - Vol. VI, No. 2
Download Image:
Full Size (2.09 MB)
Tags:
Photo by:
Manuel J Marien |
VIRIN:
THE-UNBREAKABLE-CIPHER.PDF
Photo Gallery
History Today Articles
Search
Search
Upload Date
Upload Date
Document Date
Title
Share
The Unbreakable Cipher
Spring 1961 - Vol. VI, No. 2
Download Image:
Full Size (2.09 MB)
Tags:
Photo by:
Manuel J Marien |
VIRIN:
THE-UNBREAKABLE-CIPHER.PDF
Photo Gallery
Military Cryptanalysis
Search
Search
Upload Date
Upload Date
Document Date
Title
Share
The Unbreakable Cipher
Spring 1961 - Vol. VI, No. 2
Download Image:
Full Size (2.09 MB)
Tags:
Photo by:
Manuel J Marien |
VIRIN:
THE-UNBREAKABLE-CIPHER.PDF
Photo Gallery
NSA Early Computer History
Search
Search
Upload Date
Upload Date
Document Date
Title
Share
The Unbreakable Cipher
Spring 1961 - Vol. VI, No. 2
Download Image:
Full Size (2.09 MB)
Tags:
Photo by:
Manuel J Marien |
VIRIN:
THE-UNBREAKABLE-CIPHER.PDF
Photo Gallery
NSA Newsletters
Search
Search
Upload Date
Upload Date
Document Date
Title
Share
The Unbreakable Cipher
Spring 1961 - Vol. VI, No. 2
Download Image:
Full Size (2.09 MB)
Tags:
Photo by:
Manuel J Marien |
VIRIN:
THE-UNBREAKABLE-CIPHER.PDF
Photo Gallery
NSA Technical Journal Articles
Search
Search
Upload Date
Upload Date
Document Date
Title
Share
The Unbreakable Cipher
Spring 1961 - Vol. VI, No. 2
Download Image:
Full Size (2.09 MB)
Tags:
Photo by:
Manuel J Marien |
VIRIN:
THE-UNBREAKABLE-CIPHER.PDF
Photo Gallery
NSA/CSS
Search
Search
Upload Date
Upload Date
Document Date
Title
Share
The Unbreakable Cipher
Spring 1961 - Vol. VI, No. 2
Download Image:
Full Size (2.09 MB)
Tags:
Photo by:
Manuel J Marien |
VIRIN:
THE-UNBREAKABLE-CIPHER.PDF
Photo Gallery
Untangling the Web
Search
Search
Upload Date
Upload Date
Document Date
Title
Share
The Unbreakable Cipher
Spring 1961 - Vol. VI, No. 2
Download Image:
Full Size (2.09 MB)
Tags:
Photo by:
Manuel J Marien |
VIRIN:
THE-UNBREAKABLE-CIPHER.PDF
Photo Gallery
NSA/CSS Policies
Search
Search
Upload Date
Upload Date
Document Date
Title
Share
The Unbreakable Cipher
Spring 1961 - Vol. VI, No. 2
Download Image:
Full Size (2.09 MB)
Tags:
Photo by:
Manuel J Marien |
VIRIN:
THE-UNBREAKABLE-CIPHER.PDF
Photo Gallery