Yesterday we wrote about a hacker putting up for sale a batch of 167 million LinkedIn user details on the Dark Web, of which 117 million entries contained account passwords in hashed format.

These passwords were hashed with the SHA1 algorithm. This is a strong data encryption algorithm, but it is a breakable system, given enough time and resources.

Additionally, in 2012, LinkedIn didn’t “salt” the passwords, meaning there were not random buffer bits added to the encrypted data to make it harder to break.

If you imagine the bad guys are going to have an easy time cracking these passwords, you aren’t wrong. Even the good guys had an easy time doing so.

LeakedSource, a website that inventories leaked details from public data breaches, has already broken most of these passwords and provided a Top 45 most used passwords.

This reminds us of something similar that happened last September, when a hacker called CynoSure Prime cracked a large part of the passwords from the Ashley Madison data breach.

As for LinkedIn’s response to this whole debacle, the company says it’s currently assessing how much of this data and the afferent passwords are still valid.

Back in 2012, the company did ask all affected users to change their passwords, but publicly acknowledged that only 6.5 million users as being affected.

Rank Password Frequency
1 123456 753,305
2 linkedin 172,523
3 password 144,458
4 123456789 94,314
5 12345678 63,769
6 111111 57,210
7 1234567 49,652
8 sunshine 39,118
9 qwerty 37,538
10 654321 33,854
11 000000 32,490
12 password1 30,981
13 abc123 30,398
14 charlie 28,049
15 linked 25,334
16 maggie 23,892
17 michael 23,075
18 666666 22,888
19 princess 22,122
20 123123 21,826
21 iloveyou 20,251
22 1234567890 19,575
23 Linkedin1 19,441
24 daniel 19,184
25 bailey 18,805
26 welcome 18,504
27 buster 18,395
28 Passw0rd 18,208
29 baseball 17,858
30 shadow 17,781
31 121212 17,134
32 hannah 17,040
33 monkey 16,958
34 thomas 16,789
35 summer 16,652
36 george 16,620
37 harley 16,275
38 222222 16,165
39 jessica 16,088
40 GINGER 16,040
41 michelle 16,024
42 abcdef 15,938
43 sophie 15,884
44 jordan 15,839
45 freedom 15,793
46 555555 15,664
47 tigger 15,658
48 joshua 15,628
49 pepper 15,610

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