Home > Products > Windows Passwords > Windows Password Recovery > Screenshots > Forensic tools > DPAPI > Credential history ahalysis
Credential history (CREDHIST) ahalysis
Windows Password Recovery v15.3.0
Windows Credentials Explorer
Reset Windows Password v13.1
Forensic tools to analyze Remote Desktop activity in Windows
Wireless Password Recovery v6.8.1
New templates to seach for default passwords of some broadband WiFi routers
Reset Windows Password v13.0
Full support for Windows 11, duplicate file finder, checksum calculator and some new tools

Articles and video

You may find it helpful to read our articles on Windows security and password recovery examples. Video section contains a number of movies about our programs in action

Windows Password Recovery - CREDHIST analysis

CREDHIST is a password history file, made out as a chain, where each link represents the user's older password hashes. Each time user changes the password, the old password hash is appended to the file and encrypted with a new password. Therefore, to decrypt all the hashes in a chain, you must know the user's current password.

Along with hashes, the chains store other service data, which is also analyzed by this utility.

Select CREDHIST file

Selecting CREDHIST file


And proceed to analyze its content

CREDHIST analysis

On the screenshot, you can see that the CREDHIST identifier is 93c85e9c-130e-4ede-9063-576492e41a1d. This is the identifier (GUID) all user's Master Keys in the context of the data owner are attached to. The number of links in the hash chain is 2.

The list below contains all attributes and their values for each link of our CREDHIST.

Attribute description
  • dwVersion - data structure version
  • guidCredHist - current link unique identifier
  • dwNextCredSize - next link size
  • dwCredChainType - link type
  • algHash - hashing algorithm used when decrypting the link
  • dwPbkdf2IterationCount - iterations in the PKCS#5 PBKDF2 key generation routine
  • dwSidSize - owner security descriptor (SID) size
  • algCrypt - encryption algorithm
  • dwShaHashSize - SHA1 hash size
  • dwNtHashSize - NTLM hash size
  • pSalt - salt used in the encryption
  • sidUser - data owner SID
  • pShaHash - SHA1 hash
  • pNtHash - NTLM hash

To guess the original CREDHIST password, right-click on the attributes and then select 'Use a dictionary to validate password...' on the context menu that appears. You can validate the password or PIN for both currently selected and all the records. The validation time increases proportionally to the number of the records (i.e. links).

See the original CREDHIST password search speed comparative table. The speed is measured on a single-core Intel Q8400 CPU for default OS configurations (for example, in Windows 7, the number of iterations in PBKDF2 may differ).

Operating System Encryption algorithm Hash function PBKDF2 counter Password check speed (p/s)
Windows XP 3DES SHA1 4000 76
Windows Vista 3DES SHA1 24000 12
Windows 7 AES256 SHA512 5600 10
Windows 10-11 AES256 SHA512 8000 7