What is the meaning of the word Encryption?
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when something is written so that other are not able to decipher it.  so that it is only read by the right people.
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Encryption Algorithms\n\nDifferent encryption algorithms use proprietory methods of generating these keys and are therefore useful for different applications. Here are some nitty gritty details about some of these encryption algorithms. Strong encyrption is often discerend by the key length used by the algorithm.\n\nRSA\nIn 1977, shortly after the idea of a public key system was proposed, three mathematicians, Ron Rivest, Adi Shamir and Len Adleman gave a concrete example of how such a method could be implemented. To honour them, the method was referred to as the RSA Scheme. The system uses a private and a public key. To start two large prime numbers are selected and then multiplied together; n=p*q.\n\nIf we let f(n) = (p-1) (q-1), and e>1 such that GCD(e, f(n))=1. Here e will have a fairly large probability of being co-prime to f(n), if n is large enough and e will be part of the encryption key. If we solve the Linear Diophantine equation; ed congruent 1 (mod f(n)), for d. The pair of integers (e, n) are the public key and (d, n) form the private key. Encryption of M can be accomplished by the following expression; Me = qn + C where 0<= C < n. Decryption would be the inverse of the encryption and could be expressed as; Cd congruent R (mod n) where 0<= R < n. RSA is the most popular method for public key encryption and digital signatures today.\n\nDES/3DES\nThe Data Encryption Standard (DES) was developed and endorsed by the U.S. government in 1977 as an official standard and forms the basis not only for the Automatic Teller Machines (ATM) PIN authentication but a variant is also utilized in UNIX password encryption. DES is a block cipher with 64-bit block size that uses 56-bit keys. Due to recent advances in computer technology, some experts no longer consider DES secure against all attacks; since then Triple-DES (3DES) has emerged as a stronger method. Using standard DES encryption, Triple-DES encrypts data three times and uses a different key for at least one of the three passes giving it a cumulative key size of 112-168 bits.\n\nBLOWFISH\nBlowfish is a symmetric block cipher just like DES or IDEA. It takes a variable-length key, from 32 to 448 bits, making it ideal for both domestic and exportable use. Bruce Schneier designed Blowfish in 1993 as a fast, free alternative to the then existing encryption algorithms. Since then Blowfish has been analyzed considerably, and is gaining acceptance as a strong encryption algorithm.\n\nIDEA\nInternational Data Encryption Algorithm (IDEA) is an algorithm that was developed by Dr. X. Lai and Prof. J. Massey in Switzerland in the early 1990s to replace the DES standard. It uses the same key for encryption and decryption, like DES operating on 8 bytes at a time. Unlike DES though it uses a 128 bit key. This key length makes it impossible to break by simply trying every key, and no other means of attack is known. It is a fast algorighm, and has also been implemented in hardware chipsets, making it even faster.\n\nSEAL\nRogaway and Coppersmith designed the Software-optimized Encryption Algorithm (SEAL) in 1993. It is a Stream-Cipher, i.e., data to be encrypted is continuously encrypted. Stream Ciphers are much faster than block ciphers (Blowfish, IDEA, DES) but have a longer initialization phase during which a large set of tables is done using the Secure Hash Algorithm. SEAL uses a 160 bit key for encryption and is considered very safe.\n\nRC4\nRC4 is a cipher invented by Ron Rivest, co-inventor of the RSA Scheme. It is used in a number of commercial systems like Lotus Notes and Netscape. It is a cipher with a key size of up to 2048 bits (256 bytes), which on the brief examination given it over the past year or so seems to be a relatively fast and strong cypher. It creates a stream of random bytes and 'XORing' those bytes with the text. It is useful in situations in which a new key can be chosen for each message.
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There is so many number theory and algebra behind it but the main concept is to multiply the message matrix with a key matrix and decrypt with the inverse of the key matrix.\n\nYou can also look at Hill Cipher
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You can use Winzip or Winrar\nBoth are zip tools than enable file and folder encryption.\nhttp://www.winzip.com/\nhttp://www.rarlab.com/
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Why do you need to implement it yourself? Why not use the Crypt::Rijndael_PP module from CPAN?\n\nIf anything, you could use the module as a working implementation to study ( or copy from ).\n\nEDIT: Changed module name.
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There is no secure "password scheme" that doesn't involve some sort of encryption. If you don't have encryption, your data is on the disk "in the clear." Anyone with a binary disk reader can easily get it.\n\nTake Windows, for example. Windows doesn't use encryption to protect your files, but it can be configured to password-protect your account. There are hundreds of programs available that can easily reset a Windows password and give anyone access to your files.\n\nEncryption software is no more complex than your word processor, and some encryption software is user-friendly (PGP, WinZip). If you want to keep your data secure, you need encryption.
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That is the newest encryption algorithm developed by Baltimore Heuristics.
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Since the dawn of time encryption has been the most sought after form of information transmission, this can be done through various means. One of my favorite comes from roman times when they would use a strip of paper wound on a cylinder to write a message, then send the message to the intended receiver who had a cylinder of the same exact diameter. anyone intercepting these messages would need to have an exact diameter cylinder to even attempt to read the message, so you can imagine how for it's time this was a very sophisticated method of encryption, hell it would even baffle the majority of the population today!!!
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'Secret' means Confidential information ---- Why would anyone tell ya that?
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go get truecrypt and use it http://www.truecrypt.org/\nit's free
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tennredbear is exactly right. They want to know if you have an apptitude for cryptology (code breaking/writing). Tough but excellent rating.\n\nGood luck!
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http://en.wikipedia.org/wiki/Public-key_cryptography
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40bit, cause there is law against export of high encryption alogrithms to places outside USA.
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Simple... what is the objective of any encryption? The objective is to design a way to encrypt data so that only authorized parties can decipher and transmit it securely and efficiently.\n\nOf course you can go into a bit about how your particular encryption is better than others if you need more wording, but that is pretty much the objective or "goal" of encryption.\n\nHope it works for you. Good luck.
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i wonder why there are no answers to this question. maybe its difficult to find a direct answer online. i will tell you whatever i have learnt and understood through my information security classes so far.\n\nbasically data is decrypted over the internet depending on the technology used.\n\nData is transported over the network in packets.\n\nSome data are completely plaintext; e.g. ftp. This means that if you are on a wireless, and somebody is running a packet sniffer; he can look at your data by sniffing the packets.\n\nSome data are encrypted. There are many technologies - Private key encryption, Public key, Digital Signatures, SSL etc which can provide security at different layers of the network.\n\nNow todays network can be divided into 5 major layers - Application, Transport, Network, Data and Physical. keys and signatures help in encrypting data in Application layer. while technologies like IPSec, SSL and VPN  encrypt data over the transport and network layer. \n\nBasically in key and signature systems you need a corresponding key to decrypt the data. \n\nIn encryption at transport layer and network layer, there is no need of key as technologies like IPSec establish a secure tunnel between the host and destination computer, thus securing the data.\n\nInformation Security is a vast and nice topic. You can try to learn more by surfing - www.searchnetworking.com
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Information and useful links:\nhttp://en.wikipedia.org/wiki/Stream_cipher
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Hi \n\nOk , simple means that the info you sent or paswd sent is UNENCRYPTED , as in authentication is encrypted.Ok , if  you put your password on a site look at the bottom of the IE and youll seee a lock thats says 128 encryption , also it means the site deals with HTTPS , wish stands for Hypert Tex Transfer Protcol Secure. Write me if you need anything else