> For the complete documentation index, see [llms.txt](https://docs.devolutions.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.devolutions.net/resources/da/other-resources/what-is-sha-256.md).

# Hvad er SHA-256

SHA-256 er en kryptografisk hashalgoritme, der bruges til at kontrollere en fils integritet, f.eks. til at bekræfte, at en download fra Devolutions ikke er ændret.

Familien Secure Hash Algorithm (SHA) omfatter flere kryptografiske hashfunktioner, og SHA-256 er en udbredt variant. Kryptografiske hashes fungerer som digitale signaturer for data og gør det muligt at sammenligne store datasæt ud fra deres hashværdier i stedet for deres fulde indhold. Metoden svarer til at bruge fingeraftryk til identifikation – hvert datasæt har en unik hash, og selv en lille ændring af dataene ændrer hashværdien.

SHA-256 genererer en karakteristisk hash med fast størrelse på 256 bit (32 byte) og fungerer som en envejsproces, der egner sig godt til kontrol af dataintegritet, godkendelsesudfordringer, foranstaltninger mod manipulation, digitale signaturer og blockchain-anvendelser.

Når De f.eks. henter programmer som dem fra Devolutions, hjælper SHA-256 med at kontrollere, at de modtagne data svarer til originalen, så de ikke er ændret på grund af netværksfejl eller malwareangreb. For at kontrollere en fils hash skal De blot klikke på SHA-256-ikonet på downloadsiden på webstedet for Devolutions.

Yderligere vejledning i at hente SHA-256-hashen for en fil findes i dokumentationen fra Microsoft om kommandoen [Get-FileHash](https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.utility/get-filehash?view=powershell-7.2). Sådan kan De bruge den:

```powershell
Get-FileHash C:\Users\user1\Downloads\Setup.RemoteDesktopManager.exe -Algorithm SHA256 | Format-List.
```

Denne kommando giver et struktureret output af hashværdien, så det er nemt at kontrollere filens integritet.


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