Month: July 2006

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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.

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[problem]

Want to know the encryption short or long names.

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[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.

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[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

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