Cryptographic Hash Algorithm

SHA Algorithm

Performance

SHA256
Weniger Traffic, Speicherplatz, schneller bei 32 Bit CPU

A SHA256 is always 256 bits long, equivalent to 32 bytes, or 64 bytes in an hexadecimal string format.

SHA512
Schneller bei 64 Bit CPU

As the name implies, it's 512 bits, that is 64 bytes.
But that's the hash, maybe you're wondering about a specific representation of that hash in string, as is commonly used, then it depends of the given representation.
If you write the hash in hexa, then it will be 128 characters.
If you write the hash in base64, then it will be 86 bytes (or 88 with padding).

Key generator tools

SSH
OpenSSL
GnuPG
OpenPGP

HowTo PGP

PGP

Authentication Methods

Single-Factor/Primary Authentication
Two-Factor Authentication (2FA)
Single Sign-On (SSO)
Multi-Factor Authentication (MFA)
Password Authentication Protocol (PAP)
Challenge Handshake Authentication Protocol (CHAP)
Extensible Authentication Protocol (EAP)
Certificate-based authentication
Biometric authentication
Token-based authentication

4 Wege Auth

- Key
- Pass
- MSG
- Device

Lab

- Hash
- Key
- Linked_Time
- Stamp
Proof of ?!

FIPS-180-2

GPU is faster than CPU for SUMHASH

mkpasswd?!

openssl speed sha256 vs sha512

key derivation functions Schlüsselableitungsfunktion check argon2 pack!

Public key infrastructure (PKI)

Encryption, hashin, digital signatures Installing and configuring PKI solutions

Zertifikate und Protokolle!

Secure Socker Layer (SSL) (OLD) Transport Layer Security (TLS) (NEW)

Cryptographic Key Storage

- Public Key Infrastructure (PKI) certificate
- Smart Card/Common Access Card (CAC)
- File
- Trusted Platform Module (TPM)
- Token device

Cryptography Used

- Mobile device encryption
- file system encryption
- Network traffic encryption
- File hashing
- Cryptocurrency blockchain transaction

PKI

- Hierarchy of digital security certificates
- Certificates always contain public keys
- Certificates can contain private keys
- Private keys can also be stored in a separate file

PKI Components

- Certificate Authority (CA)
- Registration Authority (RA)
- Certificate Revocation List(CRL)
- Online Certificate Status Protocol (OCSP)
- Certificate Template
- Certificate

PKI Certificates

- X.509 (ISO/IEC 9594-8)
https://de.wikipedia.org/wiki/X.509

SSL VPN

Client Security Protocol Configuration

SHELL OPENSSL | SHASUM

$ echo -n "TEXT" | openssl dgst -sha512
$ echo -n "TEXT" | openssl dgst -sha256
$ echo -n "TEXT" | openssl dgst -sha512-256
$ echo -n "TEXT" | openssl dgst -sha512-512
$ echo -n "TEXT" | openssl dgst -sha3-512
$ echo -n "TEXT" | openssl dgst -sha3-512
$ echo -n "TEXT" | openssl dgst -sha256
$ echo -n "TEXT" | openssl dgst -sha512
$ echo -n "TEXT" | openssl dgst -sha512

BASH | SHASUM

$ echo -n "TEXT" | sha256sum
$ echo -n "TEXT" | sha512sum

BASH HASH OF FILE | SHASUM

$ sha1sum {file} 
$ sha1sum {file} > {file}.sha1
$ sha1sum -c {file}.sha1
$ echo "{hashstring} {file}" | sha1sum -c