Month: July 2006

[reference]

Symmetric Algo – one key to encrypt and decrypt.

Asymmetric Algo – separate key to encrypt and decrypt.

Stream ciphers – encrypt each bit in sequence.

Block ciphers – encrypt specific blocks of bits.

Hash/Message Digests – one way ciphers, create fingerprints of data.

[/reference]

[problem]

Want to know the encryption short or long names.

[/problem]

[solution]

DES – Digital Encryption Standard. Symmetric block encryption algorithm

3DES – Triple DES. Symmetric block algo – uses DES three times.

RC4 – Rivest Cipher #4. Symmetric algo uses stream encryption.

RSA – Rivest, Shamir, Adelman. Symmetric block algo.

IDEA – International Data Encryption Algo, symmetric block algo – used by PGP.

AES – Advanced Encryption Standard (Rijndael) – symmetric block algo.

[/solution]

[example]

Demo of des3, rc4 and aes256 – using abc123 as password and thecatsatonthemat

$ echo thecatsatonthemat |  openssl enc -des3 -a -e -k abc123
U2FsdGVkX1/I03dG1d8bGYycfojc4x/S5uU1YIf1QRPRw+9AgKhVCw==
$ echo "U2FsdGVkX1/I03dG1d8bGYycfojc4x/S5uU1YIf1QRPRw+9AgKhVCw==" | openssl enc -des3 -a -d -k abc123
thecatsatonthemat
$ echo thecatsatonthemat |  openssl enc -rc4 -a -e -k abc123
U2FsdGVkX1+NuZk94r5kJdFfw8gsjlO9ZV7BDXLwm+3PNg==
$ echo "U2FsdGVkX1+NuZk94r5kJdFfw8gsjlO9ZV7BDXLwm+3PNg==" |  openssl enc -rc4 -a -d -k abc123
thecatsatonthemat
$ echo thecatsatonthemat |  openssl enc -aes256 -a -e -k abc123
U2FsdGVkX1/bGQ0rtpGi6CjkeAyyEgQjnxkSWBQ6q7XLgAApdWHA5BdEuK24r/NY
$ echo "U2FsdGVkX1/bGQ0rtpGi6CjkeAyyEgQjnxkSWBQ6q7XLgAApdWHA5BdEuK24r/NY" |  openssl enc -aes256 -a -d -k abc123
thecatsatonthemat

[/example]

[reference]

Wiki links

• DES
• 3DES
• RC4
• RSA
• IDEA
• AES

[/reference]

[tags]Encryption, DES, 3DES, RC4, RSA, IDEA, AES[/tags]