In a Nutshell : Ronald Pelton, KGB Mole

Full Name	Ronald Willam Pelton
Agency	NSA
Operation Compromised	Ivy Bells (tapping of Soviet undersea cables)
Born	Nov 18, 1940
Birthplace	Benton Harbor, MI
Pre-crime stressor(s)	Increasing homeowner's taxes, home repair costs (burden of 4 children, 1979 salary of $24.5k/yr)
Handler	Vitaly Yurchenko
Collaboration session duration	Up to eight hours
Payoff	$40,000
Sentence	3x Life, $100 fine
Time served	30 years
How caught	Soviet handler defected to USA
Evidence	Cooperating witness, tape recording, confession
Incarceration facility	Allenwood, PA. Medium security

 

A Devious Mind : The NSA - On GitHub!!!

https://github.com/nationalsecurityagency

How to Be a Good Codebreaker : Wolf (William) Friedman

Under mental equipment he would also include the faculty of being able to concentrate on a problem for rather long periods of time, without distraction, nervous irritability, and impatience. The strain under which cryptanalytic studies are necessarily conducted is quite severe and too long-continued application has the effect of draining nervous energy to an unwholesome degree, so that a word or two of caution may not here be out of place. One should continue at work only so long as a peaceful, calm spirit prevails, whether the work is fruitful or not. 'But just as soon as the mind becomes wearied with the exertion, or just as soon as a feeling of hopelessness or mental fatigue intervenes, it is better to stop completely and turn to other activities, rest, or play. It is essential to remark that systematization and orderliness of work are aids in reducing nervous tension and irritability. On this account it is better to take the time to prepare the data carefully, rewrite the text if necessary, and so on, rather than work with slipshod, incomplete, or improperly arranged material.

https://www.nsa.gov/portals/75/documents/news-features/declassified-documents/military-cryptanalysis/mil_crypt_I.pdf