Randomly chosen e-mail addresses recovered from Gravatars on the website stackoverflow.com

MD5 hashe-mail
deaef0db9515da7ab773082bedc885f1l********o@gmail.com
4332e8db20096d13aa1621dfef1b930cm***********h@gmail.com
987e8d0c638fdea594df6de36e83f1eek*****c@mail.ru
352ca01d1842d5cd5cba207be21b6b3as**********n@gmail.com
7988ebc000ecd2f9eec82d8aec1a7bbfp******s@comcast.net
0538c7ad95afc533f7191a0515c17db2g********n@gmail.com
394acbc6b35c6b78d3836dce9b48780fw*****g@bluesock.org
8e49ae9c9276118348dd3ccd6eb82046j******h@gmail.com
337c5be2dc050add219793555378a501a*********k@hotmail.com
1a7492903a5082bd48e83567b789fd37k**********2@gmail.com
d3fd3ed58359dbee64fa955a8b05dd88r*************n@gmail.com
553a37bcfa913d060502a8f0c88278d0d*****d@2taylors.com
93fff7a0d83e43862cc57dcd1370cd1fy*****f@ozdemir.be
17caf4e2de1455949177cb3cc78a3cb0c***************s@gmail.com
f98a245ff4d1b749194768c93284be39b************l@gmail.com
c45d2c954966aa4a761c1ce99ad8f505g*******d@hotmail.com
7b16662645439cef955ffea092325ee2m********q@gmail.com
5f6cab55a3ada9d7cce5831f19cc37a0p********p@gmail.com
0dd0d7b5e142c054e253f10bfc183db9k**********8@hotmail.com
b3bb0ca8e54f7179332a2c558c5b9a84h*********s@gmail.com

Losowo wybierane adresy e-mail odtworzone z Gravatarów w serwisie jakoszczedzacpieniadze.pl

MD5 hashe-mail
20cdc0454a5d9ad3276587791235a562w**********a@gmail.com
5526320f195b28425bedc009c780b962n***********m@gmail.com
db2323de5974f122a6ac62b89c7a3ddfp*****5@op.pl
05413c6488f1c09f01a0b89ea22b5890d******a@wp.pl
4f1b7e472a69c165c8ca47f78148ec75w***********0@wp.pl
c1b50ad5021d06b87cf62144f8d7b9e3s******d@o2.pl
188843dce9e29d74e382df9bb462f0d0z********r@gmail.com
6893c597d284876e2cf2d4d71458b9158******a@gmail.com
6cd540873e9973958c4a4d664ec0ee89a************t@gmail.com
0e9ce95c80749620c246ee91ce7ffa69u***************a@yopmail.com
8915a57ec246cb8cc087a624f9140b7bk********p@wp.pl
ca52cd4d6871ebbd58635fd90f0f23afk************d@gmail.com
f432e45ba8df1637336142e6aed157eaa*******5@gmail.com
cd4592af0a8e6dad7a464530eca37d56t***********t@wp.pl
aa33f7427cd25f9da56e9b13d0a645a4p***************k@gmail.com
5f056143e2de34564cb96a612281bf76k********o@gmail.com
99c5021c48ec94e64cf95aa8e4d12834v******c@poczta.fm
c378703620600eea739c94277afa5d88d***************a@gmail.com
69fdc0db83f8e7143246299dbb0857e5z**********5@gmail.com
1302b96e693a68fe308e7113fe14c0d2e****************i@gmail.com

Zabezpieczanie haseł w systemach informatycznych

Celem artykułu jest usystematyzowanie metod zabezpieczania statycznych haseł przechowywanych na potrzeby systemów informatycznych, w szczególności serwisów internetowych, wskazanie słabych stron zaprezentowanych metod oraz wyciągnięcie wniosków w postaci zaleceń dla projektantów systemów informatycznych. Na wstępie przedstawiono pojęcie kryptograficznej funkcji skrótu, a następnie omówiono kolejne metody przechowywania haseł, pokazując ich ewolucję oraz podatności na współczesne ataki. Pokazano wyniki badań nad hasłami maskowanymi w polskich bankach oraz przedstawiono najciekawsze przykłady współczesnych funkcji adaptacyjnych. Następnie dokonano autorskiej systematyzacji metod zabezpieczania haseł oraz wskazano kierunki dalszych badań. Słowa kluczowe: informatyka, hasła, uwierzytelnianie, zabezpieczanie danych, funkcje skrótu.


Password protection in IT systems

The aim of the article is to systematise the methods of securing static passwords stored in IT systems. Pros and cons of those methods are presented and conclusions as a recommendation for IT system designers are proposed. At the beginning, the concept of cryptographic hash function is presented, following discussion of methods of storing passwords showing their evolution and susceptibility to modern attacks. Results of research on masked passwords of Polish banks IT systems
are presented, as well as the most interesting examples of adaptive password functions are given. Then, the systematisation of password protection methods was carried out. Finally, the directions for
further research are indicated.


DOI: 10.5604/01.3001.0011.8036
GICID: 01.3001.0011.8036
Biuletyn WAT 2018; 67 (1): 73-92


Link: https://biuletynwat.pl/resources/html/article/details?id=170409

Kryptograficzne funkcje skrótu

Celem artykułu jest przegląd informacji dotyczących funkcji skrótu oraz przedstawienie najnowszych osiągnięć kryptografii w tym zakresie. Wyjaśnione są podstawowe pojęcia dotyczące funkcji skrótu, ich zastosowanie oraz metody ataków. Pokazany jest bieżący stan kryptoanalizy znanych i powszechnie stosowanych funkcji skrótu: MD4, MD5, SHA. Na zakończenie omówiona jest przyszłość funkcji skrótu i zakończony konkurs na nowy standard funkcji SHA-3.


Cryptographic hash functions

The article presents a synthesis of information about the hash function and shows the latest developments in this field of cryptography. Basic concepts of the hash function are explained: definition, properties, classification, usage of the hash function and methods of attacks. The current state of cryptanalysis of known and commonly used hash functions (MD, SHA) is shown as well as consequences coming from this. At the end the attention will be paid to the future of the hash function and the current state of art in the competition for developing the new standard of SHA-3 function.


Zeszyty Naukowe Akademii Marynarki Wojennej, 2 (193), 2013, 91-102


Link: https://www.amw.gdynia.pl/images/AMW/Menu-zakladki/Nauka/Zeszyty_naukowe/Numery_archiwalne/2013/ZN_2013_2/11_Rodwald%20P.pdf

Survey PNA 2018

The results of the password security survey conducted among students at the Polish Naval Academy in 2018.

The survey was conducted at all faculties, both among military and civil students, both among Polish students (460 questionnaires) and foreign (50 questionnaires) as part of the diploma thesis.


1. The first group of questions concerns general issues related to passwords.


Do you use the same password on different websites?

AnswerNumber of answers
codemeaningquantitypercentage
TYES25755.87 %
NNO20344.13 %


How many unique passwords do you have to protect your Internet accounts/profiles?

AnswerNumber of answers
codemeaningquantitypercentage
=1=1296.30 %
2-32-323751.52 %
4-54-513028.26 %
6-6-6413.91 %


Have you ever thought about the safety of your Internet passwords?

AnswerNumber of answers
codemeaningquantitypercentage
TYES33873.48 %
NNO12226.52 %


2. The second group of questions concerns the level of difficulty for passwords belonging to particular categories.


Set the level of difficulty of the password you use (or you would use) for the following categories of Internet services: Financial services for example Internet banks

AnswerNumber of answers
codemeaningquantitypercentage
1Very weak20.43 %
2Weak40.87 %
3Medium429.13 %
4Strong13529.35 %
5Very strong27760.22 %


Set the level of difficulty of the password you use (or you would use) for the following categories of Internet services: Social networks for example Facebook

AnswerNumber of answers
codemeaningquantitypercentage
1Very weak30.65 %
2Weak204.35 %
3Medium11825.65 %
4Strong21847.39 %
5Very strong10121.96 %


Set the level of difficulty of the password you use (or you would use) for the following categories of Internet services: Access to email for example Gmail

AnswerNumber of answers
codemeaningquantitypercentage
1Very weak61.30 %
2Weak235.00 %
3Medium11625.22 %
4Strong20644.78 %
5Very strong10923.70 %


Set the level of difficulty of the password you use (or you would use) for the following categories of Internet services: Entertainment services for example Netflix

AnswerNumber of answers
codemeaningquantitypercentage
1Very weak173.70 %
2Weak4810.43 %
3Medium17337.61 %
4Strong15633.91 %
5Very strong6614.35 %


Set the level of difficulty of the password you use (or you would use) for the following categories of Internet services: Electronic commerce services for example Amazon

AnswerNumber of answers
codemeaningquantitypercentage
1Very weak132.83 %
2Weak265.65 %
3Medium14030.43 %
4Strong17137.17 %
5Very strong11023.91 %

All above presented results on one figure (from left to right):

  • Financial services
  • Social networks
  • Access to email
  • Entertainment services
  • Electronic commerce

3. The third group of questions concerns a subjective opinion on the strength of passwords.


Password strenght 1467234690

AnswerNumber of answers
codemeaningquantitypercentage
1Very weak449.57 %
2Weak9320.22 %
3Medium16235.22 %
4Strong12026.09 %
5Very strong418.91 %


Password strenght 19860425

AnswerNumber of answers
codemeaningquantitypercentage
1Very weak5511.96 %
2Weak14030.43 %
3Medium16836.52 %
4Strong7616.52 %
5Very strong214.57 %


Password strenght zxcvbn12

AnswerNumber of answers
codemeaningquantitypercentage
1Very weak163.48 %
2Weak7716.74 %
3Medium15533.70 %
4Strong15233.04 %
5Very strong6013.04 %


Password strenght Q2W3E4R5

AnswerNumber of answers
codemeaningquantitypercentage
1Very weak183.91 %
2Weak8718.91 %
3Medium16034.78 %
4Strong14230.87 %
5Very strong5311.52 %


Password strenght qazwsxed

AnswerNumber of answers
codemeaningquantitypercentage
1Very weak398.48 %
2Weak12627.39 %
3Medium19041.30 %
4Strong8618.70 %
5Very strong194.13 %


Password strenght KasiaNowak

AnswerNumber of answers
codemeaningquantitypercentage
1Very weak34875.65 %
2Weak7516.30 %
3Medium245.22 %
4Strong51.09 %
5Very strong81.74 %


Password strenght K@$i@N0w@k

AnswerNumber of answers
codemeaningquantitypercentage
1Very weak357.61 %
2Weak9420.43 %
3Medium10723.26 %
4Strong14130.65 %
5Very strong8318.04 %


Password strenght KawonAisak

AnswerNumber of answers
codemeaningquantitypercentage
1Very weak6514.13 %
2Weak17337.61 %
3Medium17137.17 %
4Strong449.57 %
5Very strong71.52 %


Password strenght iwonka21

AnswerNumber of answers
codemeaningquantitypercentage
1Very weak19642.61 %
2Weak18640.43 %
3Medium6113.26 %
4Strong102.17 %
5Very strong71.52 %


Password strenght KarOlcia9

AnswerNumber of answers
codemeaningquantitypercentage
1Very weak11925.87 %
2Weak18840.87 %
3Medium11925.87 %
4Strong235.00 %
5Very strong112.39 %


Password strenght Aizuz1996!

AnswerNumber of answers
codemeaningquantitypercentage
1Very weak4710.22 %
2Weak15433.48 %
3Medium15834.35 %
4Strong7616.52 %
5Very strong255.43 %


Password strenght RDE1095Ja

AnswerNumber of answers
codemeaningquantitypercentage
1Very weak81.74 %
2Weak459.78 %
3Medium15233.04 %
4Strong18039.13 %
5Very strong7516.30 %


Password strenght passw0rd

AnswerNumber of answers
codemeaningquantitypercentage
1Very weak16736.30 %
2Weak17437.83 %
3Medium8718.91 %
4Strong224.78 %
5Very strong102.17 %


Password strenght Q5!gH$?aWd

AnswerNumber of answers
codemeaningquantitypercentage
1Very weak61.30 %
2Weak91.96 %
3Medium296.30 %
4Strong12326.74 %
5Very strong29363.70 %


Comparison of strength of passwords which belongs to particular group.

In the real survey, passwords belonging to the same group were not
one next to the other.

Group 1

The first group of passwords consists of numbers only: 19860425 (8-digits) and 1467234690 (10-digits).


Group 2

The second group of passwords consists of a combination of keys located close to each other on the keyboard : zxcvbn12, Q2W3E4R5, qazwsxed.


Group 3

The third group of passwords consists of string made only from first and last names in three different forms: KasiaNowak (name and surname), K@$i@N0w@k (name and surname enriched with LeetSpeek – exchange of selected letters for special characters), KawonAisak (name and last name is a reverse).


Grupa 4

The fourth group of passwords consists of name only, enriched with: digits iwonka21; uppercase letters and digitKarOlcia9; reverse, digits and special sign Aizuz1996!.