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

MD5 hashe-mail
1c509d3ad3e3c892d9b3bfdde4116f58m*******l@gmail.com
d9c9fafdb19f13669baa153197a5d6cen***********0@hotmail.com
9ed0ebf03817f2fa72dded5ad5db9303b*******h@gmail.com
a2becc2ed4eda383c18ecaa0e063beb3g************4@yahoo.com
4e4adc9afaaeb00ce0bcd2194ac8aa24j********l@gmail.com
d50b0e9ba746ef1b8a5340ec055d173ai********x@gmail.com
7d88a30e454965ae67d1024f075e914es********3@gmail.com
1dc75f8022e5ca75f20bca3e49b70654x*********d@gmail.com
67348408c9a0d3f99a3e500860553a45a****n@aronson.co.il
6e87a3676e44e6630ebdd7c7469c887ba************r@gmail.com
614902035b16e6cea6d0c479bef41cc7a*********n@gmail.com
40257165d13555b32b0df03b297f7520p*************i@gmail.com
80de381cafd6319416576ca8efff660ec***************u@gmail.com
b48375031cd826ac42542becfdc16060r**************l@gmail.com
983a3d7ded86526ed7db1194eccbd931s**********x@hotmail.com
66224e1ad2a88bdaef46222ffa68d1deg*******u@gmail.com
cc89fe4414da162e503874f5d1bd2eb6g********l@gmail.com
b73f595119187405468d5ecd5b608059c******e@gmail.com
3e4ab501d9a725ab993bb54e21c54f82c*******t@jimenez-david.fr
bd79ab2a1596e5cc7d94945ffa393bd4a********o@hotmail.com

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

MD5 hashe-mail
154afe43ecb367778441a42f42b8c1fee********6@op.pl
2e52761613942e62cbd2e14a04c42834s********1@wp.pl
f75352643f6fb24c461a22958192c6b9t*******a@gmail.com
a3a985a7b515f6ebb73c78330ec845b0o*********o@gmail.com
51a935784ae5c714654f18b4211d14907*******k@gmail.com
91826842a143c7b21ce400d3e982a14am***************k@gmail.com
fb5afc532105a3ac11b85838218cfa16m***********6@tlen.pl
933f3ebc40d0f19ea2f9e2eab86f72c8a***********3@gmail.com
76a91e311f29b65b27d9fc02b6a510ebg***********1@gmail.com
a0d195d0ef035ec60b5ee367d776f2e0r****s@o2.pl
b8145479bd863975bab3fa527b809f98g********4@o2.pl
d88772ba208c74740f33710b9d5bdae4a****************r@gmail.com
5d4eeb640cb7c529e96a0972f22f4822d*********i@interia.pl
1bceed4afa50ec81b9d0564a2f0ad2f5k******************i@gmail.com
4cdbbae8d59eb7b1e124f49629123729s*********y@gmail.com
af1822a9827f89f6afae2fba3fc400f4a************k@gmail.com
e972435b1cf560a66d4a881ab00d40cak*****m@interia.pl
44c6ad5b7bb75677b03d6002eb885c6cb************m@tlen.pl
32716a0ce5c774fe245df1ea11c65af7h**********a@gmail.com
b2c30267bcb6d677892fc4b06ccb16d2z*z@wp.pl

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!.